Vol. 6, No. 3-4, September - December, 1992 151 A revision of the New World species of Norrbomia (Diptera: Sphaeroceridae), inch.ding all American species previo'.sly placed in Borborillus Stepllell A. Malsllall Department Of Environmental Biology, University of Guelph Guelph, Ontario, Canada, N1 G 2W1 and Allen L. Norrbom Systematic Entomology Laboratory, PSI, Agricultural Research Service, USDA, c/o National Museum of Natural History, NHB 168, Washington, D.C. 20560 Abstract The New world species formerly placed in Bilrb67ilbts I hlda CspbaA1'Oi'Aridae' I :Opmmyzinae) are trans- ferredtoNorrbomiaPapp. Theseare:N. lacteipennis(Malloch), n.comb.,N. jitmipennis(Stenhammar),n.comb., N. {tigipennis (Spuler), n. comb., N. scripta (Malloch), n. comb., and N. sordida (Zetterstedt). Norrbomia jitlvipennis, N. singusta, N. mexicana, N. triglabro, and N. yukonensis are described as new. Borboros articus MallochissyrwnymizedwithNo {amipennis, andBot burassingalaris Spaler is syrwnymized with No scripta. All tenNewWorld speciesofNorrbomia arekeyed. illustratedanddescribed. Theirrelationshipsarediscussed and a cladograrn is provided. Species in two ofthedefined clades arekleptoparasiticon dWIg rolling scarab beetles. Introduction Materials and methods Most Holarctic species of Sphaeroceridae with a Morphological terminology follows that of closed basal cubital cell, an apiCO"v'entral spur on the MeAlpine (1981). As in most CopJ:6mYzinae, the hindtibia, a singlerowofpostocularbristles.andonly pattern of microtrichia on the frons, gena, and tho- fourscutellarbristlesuntllnowhavebeenincludedin racicpleuronvarlesconsiderablyamongthespeciesof the genus Rorborilb1.s Duda Papp (1988) recently Norrhomia. and isuseful todistinguish them (Figs 4- discovered that the type speCIes of BorbOnllUS, the 25). ThischaracterlSmoredifficUlttousemN01TbOmw European species B. uncinatus (Duda), as well as B. than. in most other oopromyzine genera, hOVlre>.rer, vitripennis (Meigen), are not closely related to most becauseinsomespecies(e.g.N.lacteipennis(Malloch), other IIoiarctic speciesplacedinBorborillus, butale Figs. 1 2) the cuticle is more striated or rugose than insteadrelatedto a primarilyAfrotropical groupthat normal, andthe bareareasarethereforenotasshiny mcludes MetabOrbOros Vanschuytbroeck, Gymno­ anddonotcontrastaswellWIth thell1lcrotrichose (or metopinaHedicke,DudaiaHedicke,and AfroborbonlS pruinose) areas In some species, the exact size and Curran. The name Borborillus therefore cannot be shape of the bare areas are difficUlt to see with the usedfortheNorthAmericanspeciespreviouslyplaeed light miooscope and were con.'irmed only by using inthatgenus. Thesespecies,inadditiontomostofthe scanning electron microscopy. Old World speCIes preVIously m Borborillus, should Wnen discusSIng the genal bare area we are now be treated within the geWIS Noribomia Papp, referring mainly to the anterior part that extends proposed for N. mdun Papp and a number of alongthe ventralmargIn ofthe eye. There IS always Afrotropieal species revised by Papp (1988). a vertieal bare area along the posterior edge of the gena from the ventral margintobehindthe eye. The exL:reme ventral margin also usually has a separate 152 Insecta Mundi Figwee 1-2. NOrrOOmia l=teipermi8. 1, high magnification ofocellar region; 2, border of microtrichose and bare areas on ~epi8temum(shows rugose areaofcuticleandwhybordersofmicrotrichoeeareasaredifficultto 110O insomespecies). very 1l81TOW bare area. The anteriorpartofthe bare Genus Norrbomia Papp area on the frons lateral to the ocelli, if present, is often difficult to see because of cuticular striations Norrbomin Papp 1988:394. Type species, N. iru:iim (Fig. 1). This bare area therefore often appears to be Papp, by original designation. smaller than it really is. We refer to the slender (inpart)Copromy:w. (BorborillU8): Richards 1965:7~, eclerotizedbasalpartofthespermathecathetextends 1967:2. to the slightly expanded, membranous spermathecal (in part)Borborillu8: authors. duet as the spermathecal neck. The spermathecae also have cylindrical basal or apical apodemes. Genericdiagnosis. Relativelyamall Copromyzinae In the Material examined sections, specimens (00. 2-4 rom long). Head: Face deeply concave, often listedwithoutmuseumacronymsaredepositedinthe with pale, membranous medial strip. Postocular Universityof Guelph collection. Acronyms for other bristles insingle row. Tlwm:c: Scutellum short, with institutions are as follows: American Museum of 4margina1bristles only. Fore first taraomereofmale Natural History (AMNH); BMNH - Natural History withstout, dark, curved, apicovent>-al spur. Midtibia Museum, London (formerly British Museum (Natu­ with anterovent>-al bristle below middle and ring of ral History»; CAS - California Academy ofSciences; preapical and apical bristles. Hindtibiawith curved, CNC - Canadian National Collection; FMNH - Field ventrally directed, apicoventral spur, thin preapical Museum of Natural History; FSCA - Florida State dorsalbristleandanterovent>-al bristlebelowmiddle. CollectionofArthropods;GUE- UniversityofGuelph; Maleabdomen: Hypandriumwithlong apodeme and lNHS - Illinois Natural History Survey; MCZ - Mu­ well developed arms; synsternite6+7withoutmedial seum of Comparative Zoology, Harvard University posterior lobe; postphallic sclerite (ec1erite between (MCZ);NRS-NatumistoriskaRiksmuseet,Stoekholm; subepandrial eclerite ('sternite 10") andbaaiphal1us) OhSU- OhioStateUniversity;UKaL-SnowEntomo­ absent; basiphal1us with well developed epiphallus; logical Museum, University ofKansas; USNM -Na­ epandrium with lateral clefts; cercus long, distally tional Museum of Natural History, Smithsonian In­ modified andconnectedtoepandrium; surstyluswith stitution; WSU - Washington State University; ZlL­ flattened inner lobe. Female abdomen: 2 spermathe­ Zoological Institute, Lund; ZMHU - Zoologisches cae,eachwithslendereclerotizedneckatleastaslong MuseumanderHumbolt-Universitat. Becauseofthe as main partofspermatheca (except in N. hispanica largenumberofspecimensexaminedofN. frigipennis (Duds» and with large basal or apical apodeme. andN. sordida, wehavenotlistedcompletecollection data for these species, Vol. 6, No. 3-4, September - December, 1992 153 Table 1. List of characters and states used in phylogenetic anal}sis of ~"lorrbomi4. State 0 iB hypothesized as plesiomorphic. 1. Basiphallus .0)slender, lengthusuallymarethan3.5xwidth(in 17. Hypoproct . 0) anterior margin not strongly concave, without latemlvie",..); 1) shOl't and Bteut, lengthuBUally less than 3.0. seplU'llte selerite; 1) anteriCll' margin strongly eE>neave, with (++) separate bIfid sclente. (+++) 2.Malecercus•0)simpleandsmall; 1)modified,usuallylarge.(+++) 18. Epandrium setation • 0) dOl'8al and lateral setae similar; 1) 3. SpennaLheea neck • 0) absent or shorl:et than main part of dorsal setae less than halfaslollg as moBL lateral seLae. (++) spennatheea; 1) &8 long &8 main part ofspennatheea. (++) 19. Base of male _s and bel'deFing pal't of epandrium 0) 4. SUl'IItylus • 0) WIthout bIadelike mes81 lobe; I) WIth bladelike WIthoutclust.erofbristles; I)WIthclust.erofnumerousbristles. mesal lobe. (+++) (++) 5. DistiphaHus 0) without basal sclerite, 1) with basal sclerite. 20. Tarsi color • 0) similm to Libiae, 1) paler th8nLibiae. (+) (+++) 21. Female sternite 4 • 0) entire; 1) bipartite; 2) tripartite; 3) 6 IliBtipha 1I11s basaI sclerlt.e • 0) diVidAdj 1)1IndiVidAd (+++) cp.adrlparlit.e or aeoondariIy bipartite Stat.es 1, 2 and 3 are 7. Spennatheca basal apodeme • 0) smallorabsent; 1) large. (+++) hypothesized as independently derived from state O. (++) 8. Frena miaettiehialpattern 0)withbare spats borderingoeelli; 22. Female tergites 6 anti 7 0) entire to mOOer ately trilobed 1) entirelY microtricli08e; 2) entirely bare. States 0 ana 2 are posteriorly(incisions extendedless than213 distance toante· assumed to be mdependentty derIved from state O. (+) nor margm); 1) very deeplY lobate postenorlV ImClSIOll8 9. Hind tibia· 0) with stout anteroapical bristle; 1) without stout extended mare than 2/.3 distance to anterior margin). (++) antlll'Qapical bristle (+) 23 Female teIlJite 6 0) not bipartite; 1) bipartite. (+) 10. EPlproct setation . 0) more than 1 pall'; 1) I paIr. (+) 24. EPlproct • 0) not elongate, not bllobed anteriorly; 1) elongate, 11. Distiphallus basal sclerite • 0) lateral parts not sheathlike; 1) bilobed anteriorly. (+) lateml parts aheathlike. (I I I) 25. IIypoproct 0) anteriw edgenotbilobed; anteromedialpartnot 12. Spennatheca shape· 0) spheroid; 1)teardrop shaped (+++) ooncave; 13. F'em81e sterriites 6 and 'I . 0) anterIorly WIthout transverse 1) antenor edge bdOlJed, anteromediBl plll"t concave. (+) groove; 1) anteriorly with transverse groove. (+++) 26. KIeptoparasitic on 8C8rBb beetles· 0) no; 1) yes. (++) 14. Suratylus,poateloventralpart O)withoutzow ofatoutbriatles, 27. Bristles ofpoateroventralpartofauratylua· 0) allOt L1;0 m0der­ 1)with distinctrow oflong, stout, inwlll'dly directed bristles. ately long; 1) extremely long. (++) (+++) 2B Male cereus. 0) single lobed arnot with jnner lobE' longer than 15. Anepiaternum bare area • 0) BmBlI to moderate sized, dOl'8al outer lobe; 1) bilobed or notched, with long inner and shorL marginmore ax less Ie.elwithor .entra! to •entralmarginof outer lobe. (++ I) spiracle; 1) large, d01'88l margin levelwith ordOl'88.1 to dOl'8BI 29. Pleura of female segments 6 and 7 • 0) simple; 1) rugose or marginofapiracle;2)entirelybare.StatesOand2are 88Sumed striate. (++) to be independently derived from state O.