Lasioglossum (Dialictus) timothyi Gibbs, 2010

Gibbs, Jason, 2010, Revision of the metallic species of Lasioglossum (Dialictus) in Canada (Hymenoptera, Halictidae, Halictini) 2591, Zootaxa 2591 (1), pp. 1-382 : 333-337

Lasioglossum (Dialictus) timothyi Gibbs , new species

( Figures 226A–D , 227A–G )

Holotype. ♀ CANADA, Ontario, Norfolk Co., Turkey Point Provincial Park , N42°42.227´W080°19.877´, 7–20.vi.2006 (A. Taylor); [ PCYU].

Diagnosis. Females of L. timothyi can be recognised by the diagnostic combination of a wide head (length/ width ratio = 0.90–0.93), supraclypeal area noticeably convex, mesoscutal punctation moderately sparse medially (i=1–3d), mesepisternum weakly rugose, propodeum oblique carina strong ( Fig. 226D ), strong T1 acarinarial fan complete dorsally, and brown metasomal terga with distinct punctures on the apical impressed areas. They are similar to L. versatum , L. zophops , L. cressonii , and L. ceanothi . Female L. versatum have weak oblique carinae and the T1 acarinarial fan open dorsally. Female L. zophops have a rugulose mesepisternum with distinct punctures on ventral portion. Female L. cressonii have very strongly rugose mesepisternum and coarse mesoscutal punctures. Female L. ceanothi have weak oblique propodeal carinae and moderately dense mesoscutal punctures (i=1–1.5d).

Males of L. timothyi can be recognised by the moderately elongate head (length/width = 0.98), dense tomentum limited to the lower paraocular area, moderately elongate flagellomeres (length/width ratio = 1.54– 1.71), mesoscutum polished due to weak microsculpture and with strong punctures sparsely distributed on central disc (i=1–3d), rugose mesepisternum to strongly reticulate-punctate, lateral surface of propodeum rugose, brown metasomal terga with distinct punctures on apical impressed areas, and metasomal sterna with sparse pubescence. They are similar to L. cressonii which have the mesepisternum coarsely rugose.

Description. FEMALE. Length 5.67–6.53 mm; head length 1.44–1.58 mm; head width 1.61–1.73 mm; forewing length 4.09–4.39 mm.

Colouration. Head and mesosoma blue-green. Clypeus with apical half blackish brown, basal half and supraclypeal area bronze. Antenna dark brown, F2–F10 with ventral surface reddish brown. Tegula reddish brown. Wing membrane dusky, venation and pterostigma amber. Legs brown, medio- and distitarsi reddish brown. Metasoma dark brown, terga and sterna reddish brown to translucent brownish yellow.

Pubescence. Dull white. Moderately dense. Head and mesosoma with moderately dense woolly hairs (1– 1.5 OD), longest on genal beard, metanotum and mesopleuron (2–2.5 OD). Lower paraocular area and gena with sparse tomentum not obscuring surface. Metanotum anteromedial margin with tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metepisternum without tomentum. Metasomal terga with moderately dense, fine setae. T1 acarinarial fan complete dorsally. T2–T3 basolaterally and T4 entirely with tomentum partially obscuring surface. T2 apicolateral and T3–T4 apical margins with weak fringes.

Surface sculpture. Face imbricate, punctation fine. Clypeus polished, basal margin imbricate, punctation moderately dense (i=1–2d). Supraclypeal area with punctation moderately sparse (i=1–2.5d). Lower paraocular area punctation dense (i≤d). Antennocular area punctation moderately dense (i=1–1.5d). Upper paraocular area and frons reticulate-punctate. Ocellocular area obscurely punctate (i≤d). Gena weakly lineolate. Postgena weakly imbricate. Mesoscutum tessellate-imbricate, punctation moderately strong, sparse between parapsidal lines (i=1–3d), dense laterad of parapsidal lines (i≤d), and anterolateral portions punctate-reticulate. Mesoscutellum polished, submedial area punctation sparse (i=1.5–3d). Axilla punctate. Metanotum rugulosoimbricate. Preëpisternum rugose. Hypoepimeral area densely rugulose. Mesepisternum dorsal portion rugose, ventral portion rugulose. Metepisternum with dorsal third rugoso-striate, ventral portion imbricate. Metapostnotum with strong anastomosing rugae reaching posterior margin. Propodeum with dorsolateral slope rugose, lateral and posterior surfaces of propodeum rugulose. Metasomal terga polished except apical T1 declivitous surface and apical impressed areas weakly coriarious. T1 dorsal surface punctation sparse (i=2–5d). T2–T4 punctation on basal halves moderately dense (i=1–1.5d), obscure and sparse on apical halves (i=1–2.5d).

Structure. Head very wide (length/width ratio = 0.90–0.93). Eyes convergent below (UOD/LOD ratio = 1.16–1.20). Clypeus 1/2–2/3 below suborbital tangent, apicolateral margins convergent. Antennal sockets close (IAD/OAD = 0.5). Frontal line carinate, ending 2 OD below median ocellus. Supraclypeal area distinctly convex. Inner metatibial spur pectinate with 3 teeth. Metapostnotum moderately elongate (MMR ratio = 1.24–1.36), posterior surface angled. Propodeum with oblique carina strong, lateral carina nearly reaching dorsal margin.

MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 5.73 mm; head length 1.49–1.61 mm; head width 1.51–1.64 mm; forewing length 3.84–4.51 mm

Colouration. Flagellum with ventral surface reddish brown to brownish yellow. Tegula dark to reddish brown. Wing membrane subhyaline, venation and pterostigma reddish brown. Tarsi pale brownish yellow.

Pubescence. Paraocular area below eye emargination with dense tomentum obscuring surface. Upper clypeus and lower frons with tomentum partially obscuring surface. Metasomal terga without tomentum. S2– S4 with sparse apicolateral tufts.

Surface sculpture. Gena and postgena strigate. Mesoscutum polished, punctation deep, moderately sparse between parapsidal lines (i=1.5–2.5d), closer laterad of parapsidal lines and on anterolateral portions (i≤d). Mesepisternum rugose to coarsely reticulate-punctate. Metapostnotum with strong, mostly longitudinal rugae. Propodeum with dorsolateral slope and lateral and posterior surfaces of propodeum rugose. Metasomal terga polished except apically impressed zones coriarious. T1 dorsal portion and T2–T5 basal portions distinctly punctate (i=1–2d). T2–T3 apical impressed areas punctation scattered.

Structure. Head moderately wide (length/width ratio = 0.98). Eyes strongly convergent below (UOD/LOD ratio = 1.41–1.48). Antennal sockets distant (IAD/OAD> 1.3). Pedicel subequal to F1. F2 length 2.0X F1. F2–F10 moderately elongate (length/width ratio = 1.54–1.71). Metapostnotum truncate (MMR ratio = 1.23– 1.38), posterior margin weakly carinate, sharply angled onto posterior surface.

Terminalia . S7 with median lobe narrowly clavate, apex rounded ( Fig. 227F ). S8 with apicomedial margin weakly convex ( Fig. 227F ). Genitalia as in Fig. 227D–E . Gonobase with ventral arms widely separated. Gonostylus small. Retrorse lobe elongate, weakly attenuated apically.

Range. Manitoba, Ontario east to New Brunswick, south to North Carolina ( Fig. 225 ).

Allotype. CANADA: MANITOBA: 1♂ Aweme, Criddle-Vane Homestead , N49°49´27´´ W099°33´45´´, vii.2007 (L. Packer); [ PCYU].

Paratypes. CANADA: NEW BRUNSWICK: 1♀ Kouchibouguac N.P., 13.vi.1977 (S.J. Miller); [ CNC] ; ONTARIO: 1♀ topotypical, (A. Taylor) ; 1♀ Haldimane-Norfolk Co., Nixon , 11.v.1998 (H. Douglas) ; 4♀ Lambton Co., N43°13.981´W081°51.9´, 23.v.2008 (A. Taylor) ; 14♀ Lambton Co., N43°13.995´W081°51.777´, 20.vi.2008 (A. Taylor) ; 15♀ Norfolk Co., N43°42.365´W080°20.137´, 19.vi.2008 (A. Taylor); [ PCYU] ; USA: INDIANA: 1♀ Jasper Co., Nipsco , 27.v.2003 ( R. P. Jean); [ PCYU]; NORTH CARO- LINA: 1♀ Black Mts. , 1911 [ AMNH] ; MAINE: 1♀ Hancock Co., N44.3686 W068.2298, 17.vi.2002 (H.W. Ikerd) ; 1♀ Hancock Co., N44.3603 W068.2289, 17–18.vi.2002 (H.W. Ikerd) ; MASSACHUSETTS: 1♂ Plymouth Co., Plymouth, Myles Standish St. Forest , 14.vii.2006 (M.F. Veit); [ PCYU] ; MICHIGAN: 2 ♀ Ottawa Co., 4 mi WNW Holland , 26.v.2006, blueberry field, (J.K. Tuell et al.) ; 1♂, Ottawa Co., 3 mi SE Port Sheldon , 8.v.2005 (J.K. Tuell et al.); [ ARC] ; WEST VIRGINIA: 1♀ Hampshire Co., N39.3302 W078.4619, 27.v.2005 (S.W. Droege); [ PCYU] ; WISCONSIN: 1♀ Monroe Co., Fort McCoy , 1.5 mi E of Badger, 23– 26.vi.1997 (J.A. Maxwell; [ IRCW].

Etymology. It is a pleasure to name this species for my father Timothy Gibbs in recognition of his lifelong work with bees.

Floral records. FABACEAE : Baptisia , Tephrosia virginiana .

Figures

FIGURE 225. Distribution of Lasioglossum tenax (light grey) and L. timothyi (dark grey).

FIGURE 226. Lasioglossum timothyi new species. Female (A) lateral habitus; (B) dorsal habitus; (C) face; (D) metapostnotum, propodeum. Scale bars, A–C = 1 mm.

FIGURE 227. Lasioglossum timothyi new species. Male (A) lateral habitus; (B) dorsal habitus; (C) face; (D) ventral view of genital capsule; (E) dorsal view of genital capsule; (F) S7, S8. Scale bars, A–C = 1 mm, F = 0.5 mm.