J. EI\TOMOL. Soc. BRIT . COL UMBI A 82 (1985), DEC. 31 , 1985 59 TAXA OF IDIOCERUS LEWIS NEW TO CANADA (RHYNCHOTA: HOMOPTERA: CICADELLIDAE) K. C. A. HAMILTON Biosystematics Research Institude Research Branch, Agriculture Canada Ottawa, Ontario ABSTRACT Six new species and one new subspecies of Idiocerus are described: I. cabotlii from N.S., I. canae from Alberta, I. glacialis and I. indistinctus from B.C., and I. albolinea, I. musteus arsiniatus and I. setaceus, widespread east of the Cordilleran region. The identities of I. duzeei Provancher (N.S.-Ont.) and I. interruptus Gillette & Baker (N.S.-Colo.) are discussed, and these species are removed from synonymy. with black (Fig. 13); pleura yellow near wing bases, The Cicadellid tribe Idiocerini (subfamily black below; coxae black; legs tan; tegmina hyaline Idiocerinae of authors) is a large and complex with blackish veins interrupted by pale spots on in­ assembly of genera and species. The number of ner edges of basal and anteapical cells, and with genera is relatively small in the Holarctic, but the bold, pale spot on commiss ure at apices of first species feeding on Salix and Populus are numerous. claval veins. Beirne (1956) listed only 13 species and Freytag Female. Width 1.6-1.7 mm; length 4.6-5.2 mm . (1965) listed 19 of the 49 Nearctic species as occurr­ Form as in male, but antennae simple, ovipositor ing in Canada, all in the single genus Idiocerus extending one-quarter to one-fifth its length from Lewis. Since then, many additional species have pygofers, toothed as in I. xanthiops (Hamilton 1980: been discovered. Hamilton (1980) recognized 3 Fig. 120) . Colour as in male, but less boldly mark­ genera containing 82 Nearctic species, of which 1 ed, with eyes edged with pale line, dark areas on species in Rhytidodus Fieber, 3 in Balcanocerus crown and pronotum broken up into black spots, Maldonado-Capriles, and 49 in Idiocerus are now median markings on scutellum brown to tan, and known to occur in Canada. In Idiocerus there are white pronotal stripe usually narrower and greyer; an additional 6 undescribed species, 2 previously face between eyes brown, flecked with pale spots described but unrecognized species, and 1 new near ocelli, and with an arcuate chain of pale spots subspecies. across upper margin of frons; pleura and coxae pale with a black spot each, to as dark as in male; Idiocerus albolinea n. sp. tegmina sometimes with a pale brown "saddle" Nymph. Colour pale yellow, boldly marked with across clavi. deep brown on dorsum , with pale areas restricted to Hosts. A short series was taken on Salix around coronal maculae, lateral margins of pro­ amygdaloides in Manitoba. As this willow does not notum , posterior edges of wing pads, range as far east as does I. albolinea , at least one antepenultimate visible abdominal segment, and other willow host is likely. median line from head to tip of abdomen. Types. Holotype male, Tillsonburg, Ont., 3 June Male. Width across eyes 1.7 mm; length in­ 1961 (Kelton & Brumpton). Paratypes: 2 nymphs, 4 cluding folded tegmina 4.9-5.2 mm . Head much males, 6 females, 27 May and 23 July - IS August, broader than thorax, weakly produced, coronal from the following localities: Patricia Beach, Man.; margin evenly curved, posterior margin arched as Miscou Centre, N.B. ; Lone Sheiling, CBHNP, far forward as eyes (Fig. 13); antenna with very N.S.; St.-Vianney, P.Q.; Ipperwash Provo Pk. and small, narrowly oval disc one-eighth as long as Prince Edward Co., Ont.; Saskatchewan, Sask. All antennal filament, ending in prominent apical fila­ types No. 18457 in Canadian National Collection, ment, as in I. ramentosus (Hamilton 1980: Fig. 17) . Ottawa (CNC). Abdominal apodemes as in I. alternatus Fitch Remarks. This species resembles the eastern I . (idem: Fig. 58). Male genitalia as in I. alternatus alternatus, the western I. freytagi Hamilton and the (Freytag 1965: Figs, 45 , 98, 146, 191) but with northern I. strialus Fieber, but differs from these in apical pair of setae slightly longer, 0.07-0.08 mm, the length of the apical stylar setae (Figs. 17-20) . Its and preapical microsetae almost as long as apical head is also broader and only weakly produced, and setae (Fig. 18). Head pale yellow, face unmarked the median pronotal stripe is highly developed in except for two pale brown streaks down frons, and albalinea (Fig. 13) compared to that of the other gena with grey line edging lora; crown bearing two species (Fig. 9). The long, preapical stylar prominent, black coronal maculae, and broad microsetae are unique, and prevent this species brown areas interrupted at middle and next to eyes from running through the first couplet of the key with yellow ground colour; pronotum blackish (Hamilton 1980: 827) . The male antennae resemble anteriorly, brown posteriorly, with broad, median those of I. indistinctus, but this species has a single white stripe and two indefinite pairs of lateral stylar seta, and the paired apical stylar setae of greyish stripes; scutellum yellow, boldly marked albalinea show that they are not closely related. 60 j. E:\TO~IOL. Soc. BnIT. COLl.: ~tB I A 82 (1985), DEC. 31, 1985 Figs 1-8. Facial aspect of Idiocerus spp. omitting antennae: 1-3, males; 4-8, fem ales. 1-2, 5-6, I. mus/ellS verrllCOSUS Ball; 3, 7, I. mustells arsiniatus n. subsp. , holotype; 4, I. glacialis n. sp .; 8, I. cana n. sp. , holotype. Idiocerus (I. ) cabottii n. sp. Remarks. This species keys to I. distinct us Nymph. Unknown. (Hamilton 1980: 827-828) but resembles I. alter­ Male. Width across eyes 1.6-1. 7 mm; length in­ natus in its more strongly arched head margins and cluding folded tegmina 4.8-5.0 mm. Head much darker, unbanded colour pattern. Idiocerlls broader than thorax, strongly produced, coronal femoratus Ball, I. glacialis n. sp. and I . xanthiops margin sinuately curved near eyes, posterior margin have a similar style, but these have enlarged arched before eyes (Fig. II); antenna with small , mesofemora, even in "sex reversed" individuals. oval disc one-fifth length of antennal filament, as in The only other species with a similar style is I. in­ I. alternatus Fitch (Hamilton 1980: Fig. 24 ). Ab­ di.~tin c tus n. sp., a much paler western species (Fig. dominal apodemes as in alternatlls (idem: Fig. 58). 12). Male genitalia as in I. distinctus Gillette & Baker This species is named for the discoverer of Cape (Freytag 1965: Figs. 48, 100, 149, 194), with apical Breton Island, known to the English as "John seta of style small and fine, 0.05 mm long (Fig. 21 ). Cabot", who is reputed to have landed near the Dorsum chocolate- brown w ith pale flecks on crown type locality. near black coronal maculae, on anterior margin of pronotum and disc of scutellum; face pale yellow Idiocerus (I.) canae n. sp. with 2 short, brown lines on disc of frons, brown Nymph and male. Unknown. lines down sides of frons, and a heavy brown line Female. Width across eyes 1.7 mm; length in­ extending from eye across each gena, bordering cluding folded tegmina 4.9 mm. Head much lora; pleura and lateral triangles of scutellum black; median stripe of pronotum grey; legs tan; tegm ina broader than thorax, prominently produced, cor­ brownish hyaline with dark brown, setigerous veins onal margin evenly curved, posterior margin arched interrupted with white spots on inner edges of basal before eyes (Fig. 15); frons broad and inflated; and anteapical cells, and with a large, white spot on clypellus nearly parallel-margined (Fig. 8); commissure at apices of first claval veins. ovipositor extending one-fifth its length from Female. Size, shape and colour as in male, but pygofers, with toothed portion two-fifths its length, coronal margin evenly curved, antennae simple, teeth coarse and well spaced, as in I . delongi and face evenly tan; ovipositor extending one-fifth Freytag (Hamilton 1980: Fig. 121 ). Colour pale its length from pygofers, with toothed portion one­ yellow boldly patterned with a widely separated third its length , teeth fine and very close-set, as in I. double row of black spots on frons, prominent black xanthiops Hamilton (1980: Fig. 120). coronal maculae, a curvilinear row of black freckles Host. The holotype was taken on Salix on front of pronotum, black lateral triangles and eriocephala. discal spots on scutellum, black lower half of Types. Holotype male, Cheticamp River pleuron, and indefinite brown markings on frons, [mouth], Cape Breton Highlands N.P. , N.S ., 28 lora, vertex, pronotum and scutellum (Figs. 8, 15); May 1984 (H. Goulet). Paratypes: 1 male, 1 female, tegmina tan, with outer vein (R) prominently same locality, 23 May. All types No. 18450 in setose, other veins barred with dark brown as in I. C.N.C. alternatus. J. ENTO~lOL. Soc. BHlT. C OLUMBIA 82 (1985), DEc. 31, 1985 61 Hosts. The only known specimen was taken on Type. Female, No. 386 in Provancher collection, shrubs of hoary sagebrush , Artemisia cana, high on Laval University, examined by Hamilton (1976). the banks of the South Saskatchewan River. It may The size and colour are distinctive. have fl own up from a moister area. Remarks. I had previously supposed (op. cit.) Type. Holotype female, Medicine Hat, Alta., 14 that the black abdominal terga (usuall y a male August 1981 (K.G.A. Hamilton); No. 18451 in character) in an otherwise normal female specimen C.N.C. showed that the type is a "sex-reversed" individual. Remarks. This unique specimen resembles weak­ I have now examined an additional 23 females and ly patterned individuals of Idiocerus musteus Ball 3 males of this colour form from N.B., N.S.