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The Genus Rhopalosyrphus (Diptera: Syrphidae)

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186 Florida Entomologist 86(2) June 2003 THE GENUS RHOPALOSYRPHUS (DIPTERA: SYRPHIDAE) HOWARD V. WEEMS, JR.1, F. CHRISTIAN THOMPSON2, GRAHAM ROTHERAY3 AND MARK A. DEYRUP4 '(retired) Florida State Collection of Arthropods, P.O. Box 2309, Hawthorne, FL 32640-2309 'SystematicEntomology Laboratory, USDA, NHB-168 Smithsonian Institution, Washington, DC. 20560 ^Department of Natural History, Royal Museum of Scotland, Chambers Street, Edinburgh, EH1 1JF Scotland 'Archbold Biological Station, P.O. Box 2057, Lake Placid, FL 33862 ABSTRACT The flower fly genus Rhopalosyrphus Giglio-Tos (Diptera: Syrphidae) is revised. The genus is redescribed; a key to species is presented; the phylogenetic relationships of the genus and species are hypothesized; the included species are described; with new species, R. ramu- lorum Weems & Deyrup, described from Florida (type) and Mexico; R. australis Thompson from Brazil and Paraguay (type); and the critical characters are illustrated. Key Words: taxonomy, identification key, neotropics, nearctic RESUMEN El genero de la mosca de la flor del genero, Rhopalosyrphus, (DIPTERA: Syrphidae) es revi- sada y es redescrito; se presenta una clave para las especies; la relacion filogenetica del ge- nero y las especies es formulada; las especies incluidas son descritas; con las nuevas especies, R. ramulorum Weems & Deyrup, descrita de Florida (tipo) y Mexico; R. australis Thompson de Brasil y Paraguay (tipo); y los caracteres criticos son ilustrados. Translation provided by author. Rhopalosyrphus Giglio-Tos is a small group of Giglio-Tos 1892b: 34 [journal (1893:130] (descrip- microdontine flower flies restricted to the New tion); Aldrich 1905:347 (catalog citation); Kertesz World subtropics and tropics, ranging from south- 1910: 360 (catalog citation); Hull 1949: 312, figs, ern United States to northern Argentina. These (description, figures of habitus, head, abdomen, flies are rarely collected, only some two dozen hind leg); Capelle 1956 (review, key); Cole & specimens are known. The adults mimic eume- Schlinger 1969: 307 (descriptive notes); Thomp- nine vespids, such as Zethus, which nest in twigs son et al. 1976: 60 (catalog citation); Vockeroth & (Bohart & Stange 1965). The immature stages are Thompson 1987: 729 (key reference). known for only one species. These were found in Holmbergia Lynch Arribalzaga 1891: 195. ant nests (Pseudomyrmex) in twigs and grass Type species, guentherii Lynch Arribalzaga culms, where the larvae probably prey on ant (monotypy). Synonymy by Giglio-Tos (1892a). brood. The genus contains only three species. One Head: face convex, produced anteroventrally, wide ranging species, R. guentherii, is found from pilose; gena small, linear, pilose; frontal promi- southwestern United States to northern Argen- nence absent, antenna inserted above middle of tina. The others are more restricted in their head; frons short, about yA as long as face, as wide ranges; R. ramulorum, presently known from a as face (?) or slightly narrowed dorsally (8), pi- few specimens from Florida and Mexico, and R. lose; vertex broad, about 3 times as long as frons, australis from southeastern Brazil, Peru and Par- as wide as frons, not swollen, pilose and punctuate; aguay. The genus is here revised, with complete ocellar triangle small, equilateral, well separated synonymies, descriptions, and distributional and from eye margins; occiput broad on dorsal Vr, eye biological data given for all taxa. Adult terminol- bare, dichoptic in male. Antenna elongate, longer ogy follows Thompson (1999), larval terminology than face; scape and basoflagellomere elongate, at follows Hartley (1961) and Rotheray (1991). least 4 times as long as pedicel; scape about 6 times as long as broad; arista bare, inserted baso- GENUS RHOPALOSYRPHUS GIGLIO-TOS laterally on mesal surface, about as long as scape. Thorax: longer than broad; postpronotum pi- Rhopalosyrphus Gilgio-Tos 1891: 3. Type spe- lose; meso-anepisternum with anterior portion not cies, Holmbergia guentherii Lynch Arribalzaga differentiated, uniformly pilose; meso-katepister- (subsequent monotypy, Giglio-Tos 1892a: 2). Willis- num completely pilose; meso-anepimeron with ton 1892: 78 (catalog citation, descriptive note); posterior portion bare; meropleuron with barrette Weems et al.: Genus Rhopalosyrphus (Diptera: Syrphidae) 187 pilose; metasternum developed, pilose (although odon, sensu lato is unresolved: Rhopalosyrphus reduced in some species); scutum punctuate, with shares with the Microdon clade the bifid aedeagus appressed pile; metatibia expanded apically; and appears closely related to Ceriomicrodon. Ce- scutellum with or without small apical calcar, riomicrodon shares characters 3, 4, 5, 6, 7, 8 and without distinct ventral pile fringe. Wing: brown its abdominal shape could be considered derived on anterior 1/3, extensively microtrichious; mar- from that of Rhopalosyrphus. The two differ only ginal cell broadly open; stigmatic crossvein by the presence of pile on the meropleuron. present; vein Ml with apical portion straight, Microdon aurcinctus, described by Sack (1921: joining vein R4+5 perpendicularly; vein M2 138) in Rhopalosyrphus, belongs to the Pseudomi- present or absent; vein R4+5 with spur. crodon group of Microdon. The species of this Abdomen: petiolate; 1st segment short; 2nd group differ from Rhopalosyrphus in the charac- segment as broad as thorax basally, but con- ters listed above and in having the vertex swollen stricted, cylindrical apically; 3rd segment cylin- and shiny. drical; 4th and 5th segments forming a compact Based on puparial characters, the immature club; aedeagus bifid. stages of Rhopalosyrphus closely resemble Micro- Puparium: elongate with broader ventral than don. They both have the anterior end consisting of dorsal surface; marginal band of variously-sized the metathorax, with the prothorax and mesotho- setae; dorsal surface flat; ventral surface convex; rax hidden beneath it, a marginal band of setae marginal band notched anteriorly; prothorax and which surrounds the puparium except for a notch mesothorax hidden beneath metathorax; mandi- at the anterior end, sharply-pointed antennomax- ble with serrate ventral margin. illary organs and mandibles with a serrated ven- Rhopalosyrphus belongs to the subfamily Micro- tral margin. dontinae and is the sister group of Ceriomicrodon The very distinctive shape of the puparium of Hull, together these taxa are the sister group of Rhopalosyrphus separates it from that of Micro- Microdon Meigen, sensu lato. Rhopalosyrphus is don: it has a curved ventral surface that is defined (synapomorphy) by its 1) abdominal struc- broader than the narrow, fiat dorsal surface. Also, ture and 2) pilose meropleuron. Other diagnostic the whole structure is elongate rather than oval characters are 3) antenna elongate, longer than in outline. The reverse appears in Microdon, with face, usually about twice as long; 4) scape and ba- the dorsal surface being broader and curved and soflagellomere elongate; 5) face produced ven- the ventral surface narrower and flat. These dif- trally; 6) occiput greatly developed on dorsal 1/3; 7) ferences in shape suit the larva to life in hollow metasternum developed, not reduced; and 8) twigs and grass culms in which its prey, larvae metatibia flared apically. The relationship to Micr- and pupae of the ant, Pseudomyrmex, live. KEY TO SPECIES OF RHOPALOSYRPHUS 3rd tergum short, about 1/3 as long as 2nd; 2nd tergum elongate (Fig. 9); eye with an area of enlarged ran- matidia medially and posterior to antenna australis 3rd tergum elongate, as long as 2nd; 2nd tergum not greatly elongate posteriorly (Fig. 10); eye without en- larged ommatidia 2 2. Alula completely microtrichose; cell R extensively microtrichose, bare only on basoposterior 1/4 or less; metasternum appearing bare, with pile greatly reduced; face and anepisternum partially black pilose ramulorum Alula bare basomedially; cell R completely bare behind spurious vein; metasternum with long, distinct pile, not reduced; face and anepisternum entirely white pilose guentherii Rhopalosyrphus guentherii Lynch Arribalzaga Rhopalosyrphus carolae Capelle 1956: 174 A* Figs. 10-13 6 2 Arizona, Huachuca Mts., Sunnyside Canyon (HT 2 UKaL). Byers et al. 1962: 168 (HT UKaL); Holmbergia giintherii Lynch Arribalzaga Wirth et al. 1965: 599 (catalog citation); Cole & 1891: 198, Fig. 3 (habitus) Argentina, Buenos Schlinger 1969: 307 (descr. note, distr. western Aires (T 2 MACN lost?). Giglio-Tos 1892a: 2 N.A.); Thompson et al. 1976:60. NEW SYNONYM (notes), 1893: 131 [sep. 35], pi. 1, Figs. 10, lOa-b Wing length: 8.8 mm (<J)-10.5 mm (9). Head: (description, figures of abdomen, wing); Aldrich brownish black, yellowish white pilose; occiput 1905: 347 (catalog citation); Kertesz 1910: 360 grayish white pollinose on ventral 2/3, shiny dor- (catalog citation); Fluke 1957: 36 (catalog cita- sally; eye with ommatidia of more or less equal tion); Capelle 1956: 172, Fig. 2 (description, syn- size; antenna brownish black except orange basal onymy, key reference, figure of head); Thompson 1/3 of scape, about twice as long as face; antennal et al. 1976: 60 (catalog citation). ratio 5: 1: 8. 188 Florida Entomologist 86(2) June 2003 Thorax: brownish black; pleuron silvery-white Counties], Huachuca Mts, Sunnyside Canyon, 9- pilose; scutum brown pilose medially, silvery VII-1940, DE Hardy (allotype 6, UKaL). TEXAS: white pilose anteriorly, along transverse suture, Hidalgo Co: Pharr, 23-VI-1947 (1 2 USNM); La laterally and posteriorly; scutellum silvery white
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  • Hoverfly Number 43 Newsletter Autumn 2007

    Hoverfly Number 43 Newsletter Autumn 2007

    HOVERFLY NUMBER 43 NEWSLETTER AUTUMN 2007 Dipterists Forum ISSN 1358-5029 Readers may have wondered why they did not receive the Autumn 2006 newsletter (Hoverfly Newsletter No. 42) until the spring of this year, and why there was no Spring 2007 issue. The reason is that the newsletter is nowadays mailed to forum members with the Bulletin. The Autumn 2006 newsletter was prepared at the normal time for dispatch with the autumn bulletin, but no autumn bulletin was produced until the spring of this year, by which time the newsletter was some six months old. Consequently, by the time readers received it, the deadlines for submitting copy for the intended spring newsletter had long passed, and so it was not possible to produce a spring issue. To avoid delays in the catching up process two of Roger Morris‘s Recent Literature compilations are included in this issue. My thanks to everyone who has supplied copy for this newsletter, not least for the excellent response to calls for ―Interesting Recent Records‖. Copy for Hoverfly Newsletter No. 44 (which is expected to be issued with the Spring 2008 Dipterists Forum Bulletin) should be sent to me: David Iliff, Green Willows, Station Road, Woodmancote, Cheltenham, Glos, GL52 9HN, (telephone 01242 674398), email: [email protected], to reach me by 20 December 2007. CONTENTS Roger Morris & Stuart Ball Recording Scheme Update 2 Roger Morris & Stuart Ball 4th International Symposium on Syrphidae 6 Nigel Jones A note on patrolling behaviour of male Parhelophilus versicolor 8 1 Roger D Hawkins & Graham A Collins The separation of female Eumerus funeralis from E.
  • Fly Times Issue 48, April 2012

    Fly Times Issue 48, April 2012

    FLY TIMES ISSUE 48, April, 2012 Stephen D. Gaimari, editor Plant Pest Diagnostics Branch California Department of Food & Agriculture 3294 Meadowview Road Sacramento, California 95832, USA Tel: (916) 262-1131 FAX: (916) 262-1190 Email: [email protected] Welcome to the latest issue of Fly Times! Sorry it's late of course - but May is better than June for an April newletter! Being in Vietnam for most of March didn't help! I thank everyone for sending in such interesting articles – I hope you all enjoy reading it as much as I enjoyed putting it together! Please let me encourage all of you to consider contributing articles that may be of interest to the Diptera community. We all greatly appreciate your contributions! Fly Times offers a great forum to report on your research activities and to make requests for taxa being studied, as well as to report interesting observations about flies, to discuss new and improved methods, to advertise opportunities for dipterists, and to report on or announce meetings relevant to the community. This is also a great place to report on your interesting (and hopefully fruitful) collecting activities! The electronic version of the Fly Times continues to be hosted on the North American Dipterists Society website at http://www.nadsdiptera.org/News/FlyTimes/Flyhome.htm. The Diptera community would greatly appreciate your independent contributions to this newsletter. For this issue, I want to again thank all the contributors for sending me so many great articles! That said, we need even more reports on trips, collections, methods, updates, etc., with all the associated digital images you wish to provide.