Lasioglossum (Dialictus) kalinago, 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 : 3-6

Lasioglossum (Dialictus) kalinago sp. nov.

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Fig. 1 A–C

Diagnosis

Lasioglossum kalinago sp. nov. females can be distinguished from congenerics in Dominica by the presence of dark mesoscutal setae; other characters which are diagnostic in combination include the following: mesepisternum punctation indistinct dorsally, dull due to microsculpture; head wider than long (length/width ratio = 0.9; Fig. 1A ); mesoscutal punctures distinct; and T1 appressed setal fan complete. Lasioglossum dominicense sp. nov. is smaller in size, with deep and distinct punctures throughout the mesepisternum including the hypostomal area. Lasioglossum kilpatrickae sp. nov. has a longer head (length/width ratio = 1.0; Fig. 5A ) and distinct mesepisternal punctures. Lasioglossum punctifrons ( Crawford, 1914) has a longer head (length/width ratio = 1.0; Fig. 7A ), granular microsculpture with indistinct punctation and lacks a complete T1 appressed setal fan. Lasioglossum roseauense sp. nov. has only two submarginal cells and lacks a T1 fan. The male of L. kalinago sp. nov. is unknown.

Etymology

The specific epithet is named for the indigenous people of the island. It is treated as a noun in apposition.

Type material

Holotype

DOMINICA: ♀, St. Paul Parish , “Parish of St. Joseph” [sic], Springfield Estate, 15.34667° N, 61.3683° W, 430 m, 15–20 Mar. 2003, coll. M.E. Irwin & M. Shepard, Malaise trap ( BBSL).

Paratypes

DOMINICA: 3 ♀♀, St. Paul Parish, topotypical ( BBSL); 1 ♀, St. Paul Parish, ATR[E]C Springfield, Fifi trail, ‘site 2’, 15°21’ N, 61°22’ W, 442 m, 24 May–4 Jun. 2003, coll. T. Decker & W. Wells, Malaise trap, voucher #645 ( TAMUIC); 1 ♀, St. Paul Parish, ATREC, Springfield, 345 m, 15.34656° N, 61.36901° W, 7–8 Jun. 2014, coll. S.K. Kilpatrick, pan traps ( TAMUIC).

Description

Female

MEASUREMENTS (n = 4). Length 4.3–5.0 mm (mean = 4.6); head length 1.2–1.4 mm (mean = 1.3); head width 1.4–1.6 mm (mean = 1.5); intertegular distance 1.0– 1.3 mm (mean = 1.2).

COLOURATION. Head and mesosoma dull metallic green with some blue reflections, except as follows. Labrum brown. Mandible brown with red apex. Clypeus distal half dark brown. Supraclypeal area bronze. Antenna dark brown, flagellum with ventral surface dark reddish brown. Tegula dark reddish brown. Wing membrane faintly dusky with dark setae, venation and pterostigma brown. Legs dark brown, except medio- and distitarsi reddish brown. Metasomal terga blackish brown.

PUBESCENCE. Dull white, intermixed with darker setae on mesoscutum, dorsal surface of metatibia, and metasomal terga. Relatively sparse erect setae throughout, without tomentum, except narrow basolateral patches of T2–T3. 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 coarse, finer on frons. Clypeus punctation sparse (i = 1–2.5 pd), surface smooth distally (i = 2–3 pd), supraclypeal area with punctures sparse, absent medially (i = 1–2.5 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 finely carinulate. Mesoscutum with tessellate-imbricate punctation moderately coarse, dense on lateral and posterior portions (1 <pd), sparser on anterior portions and medially (i = 1–1.5 pd); mesoscutellum similar, with small submedial impunctate area (i = 1–2 pd). Metanotum imbricate. Preëpisternum rugulose. Hypoepimeral area finely rugulose. Mesepisternum below scrobe reticulate-rugulose (1 <pd), imbricate ventrally with coarse punctures. Metepisternum dorsal ¼ rugoso-carinulate, ventral portion imbricate. Metapostnotum medially with irregular rugae reaching ¾ distance to posterior margin, oblique carinulae on lateral portions extending to dorsolateral slope. Propodeum posterior and lateral surfaces polished tessellate, with some fine carinulae. Metasomal terga polished, finely coriarious on T1 anterior surface and apical impressed areas; punctation fine, obscure on basal portions (i = 1–2 pd), virtually absent on apical impressed area of T2, very obscure on apices of remaining segments. Metasomal sterna coriarious and finely, sparsely punctate (i = 2–4 pd).

STRUCTURE. Head round (length/width ratio = 0.9). Eyes weakly convergent below. Clypeus ½ 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 3–4 branches, proximal branch much longer than width of rachis. Metapostnotum slight depressed, narrowly rounded onto posterior propodeal surface. Propodeum with lateral carina nearly reaching dorsal margin; oblique carina distinct. T2–T4 impressed areas medially nearly equal to longitudinal length of basal area.

Male

Unknown.

Remarks

Lasioglossum kalinago sp. nov. bears some similarity to other West Indian species, such as L. magdalena ( Baker, 1906) , L. sanctivincenti ( Ashmead, 1900) and L. plumbeum ( Ashmead, 1900) . Lasioglossum magdalena is from Cuba and has finer punctation and a more polished mesepisternum. Specimens from the type series of L. sanctivincenti , L. plumbeum and L. cyaneum ( Ashmead, 1900) , collected in St. Vincent and the Grenadines and deposited in the NHMUK and NMNH, were examined in 2012 and 2015. Images of specimens from the type series of the latter two species are available from the NMNH. Non-types of L. sanctivincenti and L. plumbeum from St. Vincent and the Grenadines (deposited at FSCA) were also examined, and these species were found to be distinct from the Dominica fauna. Lasioglossum kalinago sp. nov. can be distinguished from these species based on multiple characters, including the distinct mesepisternal punctures of L. sanctivincenti , the long head of L. plumbeum and the bright blue metasoma of L. cyaneum .

Figures

Fig. 1. Lasioglossum (Dialictus) kalinago sp. nov. Holotype (A) and paratype (B–C), ♀♀. A. Face. B. Lateral habitus. C. Dorsum of mesosoma. 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. 7. Lasioglossum (Habralictellus) punctifrons (Crawford, 1914). Holotype, ♀. A. Face. B. Dorsum of mesosoma. Scale bars = 1 mm.