Lasioglossum (Dialictus) kilpatrickae, Gibbs, 2016

Gibbs, Jason, 2016, Bees of the family Halictidae Thomson, 1869 from Dominica, Lesser Antilles (Hymenoptera: Apoidea), European Journal of Taxonomy 180, pp. 1-50 : 11-15

Lasioglossum (Dialictus) kilpatrickae sp. nov.

urn:lsid:zoobank.org:act:90970C96-A443-4BFA-A205-6A7E6332EC95

Figs 4 C–D, 5A–C, 6A–C

Diagnosis

Lasioglossum kilpatrickae sp. nov. females have the following characteristics: head at least as long as wide (length/width ratio = 1.0; Fig. 5A ); mesoscutal and mesepisternal punctures distinct ( Fig. 5 B–C); mesoscutal setae entirely pale; and T1 appressed setal fan complete. The male is similar but lacks a T1 fan. Lasioglossum dominicense sp. nov. is smaller, with a distinctly shorter head in both sexes (length/width = 0.9) ( Figs 2A , 3A ). Lasioglossum kalinago sp. nov. has less distinct punctures on the mesepisternum and dark setae intermingled with pale setae on the mesoscutum. Lasioglossum punctifrons has granular microsculpture with indistinct punctation ( Fig. 7B ) and lacks a complete T1 appressed setal fan.

Etymology

This species is named for Shelby Kilpatrick (TAMUIC), who collected most of the type series and arranged additional Dominican bee specimens for study.

Type material

Holotype

DOMINICA: ♀, St. David Parish , Castle Bruce Beach & Estuary, 15.432225° N, 61.25539° W, 10 m, 8 Jun. 2015, coll. S.K. Kilpatrick & R. Selking, sweeping ( TAMUIC).

Paratypes

DOMINICA: 1 ♀, 2 ƋƋ, St. David Parish, topotypical ( TAMUIC); 1 Ƌ, St. Andrew Parish, Wo[o]dford Hill, 5–7 Jun. 1987, coll. R.E. Woodruff ( FSCA).

Description

Female

MEASUREMENTS (n = 1). Length 4.7 mm; head length 1.2 mm; head width 1.2 mm; intertegular distance 1.0 mm.

COLOURATION. Head and mesosoma dull metallic golden-green, except as follows. Labrum brown. Mandible brown with red apex. Clypeus distal half dark brown. Antenna dark brown, flagellum with ventral surface dark reddish brown. Tegula dark reddish brown. Wing membrane hyaline with dark setae, venation and pterostigma brown. Legs dark brown, except medio- and distitarsi and portions of metabasitarsus reddish brown. Metasomal terga blackish brown, reddish brown apically.

PUBESCENCE. Dull white. Relatively sparse erect setae throughout, without tomentum, except on gena near eye, pronotum dorsolateral angles and lobe, narrow basolateral patches of T2–T3 and sparsely on T4. Metasomal T1 with complete fan of appressed setae on anterior surface. T2 without apical fimbriae, T3–T4 with only sparse fine setae on apical impressed areas. Scopa well developed on hind leg and metasomal sterna.

SURFACE SCULPTURE. Face imbricate, punctation moderately fine. Clypeus punctation sparse (i = 1–2.5 pd), denser proximally, surface smooth distally (i = 2–3 pd). Supraclypeal area with punctures sparse, present medially (i = 1–2 pd), and lower paraocular area punctation dense (i ± pd). Upper paraocular area and frons reticulate-punctate (1 <pd). Ocellocular area punctate (i ± pd). Gena and postgena polished, finely punctate-lineolate. Mesoscutum imbricate, punctation fine, dense on laterad of parapsidal lines, posterior portion (1 <pd), slightly sparser medially (i = 1–1.5 pd), submedial areas sparser still; mesoscutellum similar with small submedial impunctate area (i = 1–2 pd). Metanotum finely punctate. Preëpisternum finely reticulate rugulose. Hypoepimeral area finely punctate. Mesepisternum below scrobe punctate (i ± d), finely imbricate. Metepisternum dorsal ¼ rugulose, ventral portion imbricate. Metapostnotum medially with longitudinal rugae reaching posterior margin, oblique carinulae on lateral portions extending to dorsolateral slope. Propodeum posterior and lateral surfaces polished tessellate. Metasomal terga polished, finely coriarious on apical impressed areas and T1 anterior face; punctation fine, obscure on basal portions (i = 1–2 pd), indistinct, sparser on apical impressed areas, T1–T2 apical impressed areas impunctate, except near lateral margins. Metasomal sterna coriarious and finely, sparsely punctate (i = 2–4 pd).

STRUCTURE. Head round (length/width ratio = 1.00). Eyes weakly convergent below. Clypeus ¾ below suborbital tangent. Gena narrower than eye. Hypostomal carinae subparallel. Pronotal dorsolateral angle obtuse. Pronotal ridge rounded, interrupted by sulcus. Tegula ovoid. Submarginal cells three (1rs-m present). Distal hamuli arranged 2-1-2. Inner metatibial spur pectinate, with 3 branches, proximal branch much longer than width of rachis. Metapostnotum narrowly rounded onto posterior propodeal surface. Propodeum with lateral carina reaching ¾ distance to dorsal margin; oblique carina fine. T2–T4 impressed areas medially about ½ longitudinal length of basal area.

Male

MEASUREMENTS (n = 3). Length 3.9–4.7 mm (mean = 4.4); head length 1.3–1.4 mm (mean = 1.4); head width 1.3–1.4 mm (mean = 1.4); intertegular distance 0.8–1.0 mm (mean = 0.9).

COLOURATION. Similar to female, except F1–F11 yellowish brown ventrally.

PUBESCENCE. Similar to female, except scopa absent. Face below eye emargination with sparse tomentum, obscuring lower paraocular area. T1 fan absent. T2–T4 with at most very sparse tomentum basolaterally.

SURFACE SCULPTURE. Similar to female, but more polished, with less evident imbricate microsculpture. Metanotum sparsely punctate (i = 1–1.5 pd). Metepisternum densely punctate (i ± pd). Metapostnotal rugae not reaching posterior margin. Lateral surface of propodeum distinctly punctate. T1–T4 apical impressed areas impunctate.

STRUCTURE. Similar to female, with typical sexual differences. Head round (length/width ratio = 1.00– 1.04). F2 length nearly 2 × F1. Scape, pedicel and F1 reaching lower margin of median ocellus. T2–T4 apical impressed areas less than ¼ of median length.

TERMINALIA. As shown in Fig. 4 C–D.

Remarks

Lasioglossum kilpatrickae sp. nov. is similar to L. plumbeum in many respects, most notably the shape of the head. Despite a close similarity, the two species can be readily differentiated. Lasioglossum plumbeum females have distinct medial punctures on the apical impressed area of T2, finer and denser punctures on the mesepisternum, as well as a dark blue colour of the head and mesosoma. Male L. plumbeum lack the tomentum on the lower face present in L. kilpatrickae sp. nov.

Figures

Fig. 4. — Genital capsule of Lasioglossum (Dialictus) dominicense sp. nov. Paratype, Ƌ. A. Dorsal view. B. Ventral view. — Genital capsule of Lasioglossum (Dialictus) kilpatrickae sp. nov. Paratype, Ƌ. C. Dorsal view. D. Ventral view. Scale bars = 1 mm.

Fig. 5. Lasioglossum (Dialictus) kilpatrickae sp. nov. Holotype, ♀. A. Face. B. Lateral habitus. C. Dorsum of mesosoma. Scale bars = 1 mm.

Fig. 2. Lasioglossum (Dialictus) dominicense sp. nov. Holotype (A, C) and paratype (B), ♀♀. A. Face. B. Lateral habitus. C. Dorsum of mesosoma. Scale bars = 1 mm.

Fig. 3. Lasioglossum (Dialictus) dominicense sp. nov. Paratype, Ƌ. A. Face. B. Lateral habitus. C. Dorsum of mesosoma. Scale bars = 1 mm.

Fig. 7. Lasioglossum (Habralictellus) punctifrons (Crawford, 1914). Holotype, ♀. A. Face. B. Dorsum of mesosoma. Scale bars = 1 mm.