Habralictus antillarus, 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 : 34-38

Habralictus antillarus sp. nov.

urn:lsid:zoobank.org:act:0AF3E368-ACF0-4F9B-99AD-115866D1A12B

Figs 17 A–C, 18A–C, 19A–B

Diagnosis

Males of Habralictus antillarus sp. nov. can be distinguished from H. gonzalezi by head wide (length/ width ratio = 0.84–0.85), clypeus with distal yellow maculation less than 1/5 longitudinal length of clypeus ( Fig. 18A ), and gonostylus short, with numerous distinct setae ( Fig. 19 A–B). In H. gonzalezi males, the head is longer (length/width ratio = 0.95–0.96), clypeal maculation is ¼ the longitudinal length of the clypeus ( Fig. 21A ; Gibbs 2012: fig. 8), and the gonostylus is long, clavate, with a single distinct seta ( Gibbs 2012: figs 12–13).

Females of H. antillarus sp. nov. have a slightly wider head (length/width ratio = 0.90) and distal dark brown maculation of the clypeus is only ¼ the longitudinal length of the clypeus ( Fig. 17A ). In females of H. gonzalezi , the head is longer (length/width ratio = 0.92–0.97) and the clypeal dark maculation is ½ the longitudinal length of the clypeus ( Fig. 20A ). Furthermore, the dark integument of the lower paraocular area extends to the eye emargination in H. antillarus sp. nov. ( Fig. 17A ), but only to the lower margin of the antennal socket in H. gonzalezi ( Fig. 20A ; Gibbs 2012: fig. 2). Lasioglossum roseauense sp. nov. is superficially similar, but can be distinguished by generic characters such as the weak distal venation of the forewing, including the absence of 1rs-m ( Fig. 8B ).

Type material

Holotype

DOMINICA: Ƌ, St. George Parish , Freshwater Lake, 21 Jan. 1965, coll. W.W. Wirth, Bredin-Archbold Smithsonian Biodiversity Survey ( NMNH).

Paratypes

DOMINICA: 1 ♀, St. George Parish, topotypical, ( NMNH); 3 ƋƋ, Freshwater Lake, 2500ʹ, 6 Mar. 1965, coll. H.E. Evans ( NMNH).

Description

Female

MEASUREMENTS (n = 1). Length 5.0 mm; head length 1.2 mm; head width 1.4 mm; intertegular distance 0.9 mm.

COLOURATION. Head and mesosoma iridescent golden-green, except as follows. Labrum brown. Mandible yellow with red apex. Clypeus distal margin dark brown. Antenna dark brown. Pronotal lobe brown. Tegula dark reddish brown. Wing membrane hyaline, with dark setae, venation and pterostigma brown. Legs yellow. Metasomal terga reddish brown, yellow basad of graduli.

PUBESCENCE. Dull white to dark brown. Relatively sparse erect setae throughout, without tomentum, except on gena near eye, pronotal lobe and posterior surface of propodeum. Metasomal T1 anterior surface bare. T3 with sparse, erect dark setae. T4–T5 with very long dark setae, most evident laterally. Scopa well developed on hind leg and metasomal sterna, meso- and metatibia and tarsi with dark setae.

SURFACE SCULPTURE. Head and mesosoma granular-tessellate, punctation indistinct. Metapostnotum medially with weak rugae, not reaching more than half distance to posterior margin, oblique carinulae on lateral portions extending to dorsolateral slope. Metasomal terga polished, T1–T2 virtually impunctate, T3 sparsely punctate (i = 3–6 pd), T4 sparsely punctate (i = 2–4 pd), apical impressed areas impunctate, T1–T2 apical impressed areas impunctate except near lateral margins. Metasomal sterna smooth, piliferous punctures present on apical half (i = 1–2.5 pd).

STRUCTURE. Head wide (length/width ratio = 0.90). Eyes weakly convergent below. Clypeus ¾ below suborbital tangent. Gena narrower than eye. Hypostomal carinae weakly divergent. 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 4 branches, proximal branch much longer than width of rachis. Metapostnotum narrowly rounded onto posterior propodeal surface; longitudinal length greater than apical width. Propodeum with lateral carina reaching less than ½ distance to dorsal margin; oblique carina absent. Metasomal terga strongly reflexed laterally, metasoma appearing relatively flat. T2–T4 impressed areas medially about ½ longitudinal length of basal area.

Male

MEASUREMENTS (n = 3). Length 4.3–4.8 mm (mean = 4.4); head length 0.9–1.3 mm (mean = 1.1); head width 1.1–1.5 mm (mean = 1.3); intertegular distance 0.7–0.9 mm (mean = 0.8).

COLOURATION. Similar to female except labrum yellow, clypeus distal margin very narrowly yellow, F2– F11 reddish to yellowish brown ventrally, and metacoxa metallic.

PUBESCENCE. Similar to female except scopa absent.

SURFACE SCULPTURE. Similar to female except punctation on T4 sparser (i = 4–8 pd).

STRUCTURE. Similar to female, with typical sexual differences. Head wide (length/width ratio = 0.84– 0.85), eyes more distinctly convergent below. F2 length nearly 2 × F1. Scape, pedicel and F1 reaching lower margin of median ocellus. Flagellomeres broadening towards apex. Inner metatibial spur simple, unbranched. Metasoma slender, widening towards T4–T5; not so strongly reflexed laterally. T2–T4 apical impressed areas less than ¼ of median length.

TERMINALIA. As shown in Fig. 19 A–B. Gonostylus short, length and width subequal, with numerous long setae.

Figures

Fig. 17. Habralictus antillarus sp. nov. Paratype, ♀. A. Face. B. Lateral habitus. C. Dorsum of mesosoma. Scale bars = 1 mm.

Fig. 18. Habralictus antillarus sp. nov. Holotype, Ƌ. A. Face. B. Lateral habitus. C. Dorsum of mesosoma. Scale bars = 1 mm.

Fig. 19. Genital capsule of Habralictus antillarus sp. nov. Paratype, Ƌ. A. Dorsal view. B. Ventral view. Scale bar = 1 mm.

Fig. 21. Habralictus gonzalezi Gibbs, 2012, Ƌ. A. Face. B. Lateral habitus. C. Dorsum of mesosoma. Scale bars = 1 mm.

Fig. 20. Habralictus gonzalezi Gibbs, 2012, ♀. A. Face. B. Lateral habitus. C. Dorsum of mesosoma. Scale bars = 1 mm.

Fig. 8. Lasioglossum (Habralictellus) roseauense sp. nov. Holotype, ♀. A. Face. B. Lateral habitus. C. Dorsum of mesosoma. Scale bars = 1 mm.