Hylaeus (Deranchylaeus) tinctulus Cockerell, 1932

Dathe, Holger H., 2014, Studies on the systematics and taxonomy of the genus Hylaeus F. (8) Revision of the Afrotropic subgenus Hylaeus (Deranchylaeus) Bridwell (Hymenoptera: Anthophila, Colletidae), Zootaxa 3874 (1), pp. 1-84 : 71-73

Hylaeus (Deranchylaeus) tinctulus Cockerell, 1932

Figures 16 , 40 , 140–143

Hylaeus tinctulus Cockerell, 1932e: 172 . ♂ ♀, Belgian Congo [ DR Congo]: Tshibinda. Typus ♂ NHM London, no. 17.a.39.— Cockerell 1936e: 10; Cockerell 1942: 3; Eardley & Urban 2010: 36.

Hylaeus (Deranchylaeus) tinctulus Cockerell : Snelling 1985: 8.

Diagnosis

This is an almost completely black species, with characteristic reduced mask in the male ( Fig. 140 ). The male scapi are expanded.

Characteristic features

Male. TL 4.9–5.4 (5.19) mm, WL 3.7–4.1 (3.86) mm.

Head. Proportions HL:HW 0.96, UFW:LFW 1.72, outline rounded trapezoid. Face in region of antenna bases strongly depressed. Scapi black, conical expanded and apically shiny, apically wider than flagella, SL:SW 1.8; flagella long black. Mask yellowish to ivory white, reduced: supraclypeal area black, clypeus patched only in lower half, side spots narrowed inwards. Clypeus CL:CW 1.63, shagreen on face sides, matt, punctation moderate, sparse. Supraclypeal area narrow; frons and vertex with strong, subcontiguous punctation. Labrum and mandibles black.

Mesosoma entirely black. Pronotum expanded forward, anterior margin with edge, dorsolateral angles blunt. Mesonotum and scutellum slightly shining, shagreen, punctation strong, close. Legs black, only foretibiae in front yellow stained; wings darkened, venation dark brown. Propodeum rounded; medial area in middle transversely impressed, lateral and distal with irregular transverse edge; terminal area without edges to lateral areas, surface moderately dense punctate, median propodeal furrow deep.

Metasoma narrow slender spindle-shaped, black. T1 shagreen, silky shining, submetallic, punctation fine, sparse, punctation of following terga somewhat finer and increasingly indistinct shagreen; T1 without lateral fringes and terminal band. Terminalia ( Fig. 16 ): gonoforcipes of genital capsule expanded and narrowed, S8 compact, apical lobi widened, laterally emarginate, S7 with apical lobi forming a short lamella, basal lobi with a few (2–3) short teeth.

Female. TL 5.4–5.7 (5.51) mm, WL 4.1–4.8 (4.41) mm.

Head. Proportions HL:HW 0.99, UFW:LFW 1.39, outline nearly circulate. Face black, sometimes with a tiny white spot below foveae. Flagella yellow below; foveae faciales long. Clypeus CL:CW 1.23, anterior margin slightly expanded forward and bent but without smooth impression, shagreen, punctation moderate, sparse, significantly finer than on adjacent face sides ( Fig. 40 ). Supraclypeal area narrow dorsally, sides next to frontal line punctate.

Mesosoma. Pronotum, calli and tegulae black. Pronotum expanded forward, rounded in front, dorsolateral angles rounded. Mesonotum and scutellum shagreen, silky shining, punctation strong, close; mesopleurae with moderate, close punctation. Legs entirely black, tarsi remarkably long; wings dimmed, venation dark brown. Propodeum rounded, terminal area edged only laterally down.

Metasoma slender spindle-shaped, black. T1 shagreen, silky shining, fine and sparse punctate, punctation of following terga somewhat finer and increasingly indistinct in shagreen; T1 with narrow white lateral fringes.

Distribution

Democratic Republic of the Congo ( Eardley & Urban 2010); Burundi.

Specimens examined: 3 ♂, 2 ♀ coll. NHML, SANC.

BURUNDI. Kibira National Park, Nyamugari, 02.5515S 29.3047E.

DEMOCRATIC REPUBLIC OF THE CONGO. Tshibinda.

Remarks

According to the male terminalia, this species forms a group with H. chimani , H. oromialis and H. camerunensis spp. n., which are closely related to the melanosoma-group.

Figures

FIGURES 16–19. Male terminalia in species of tinctulus-group.—16 H. tinctulus Cockerell (typus).—17 H. camerunensis sp. n. (typus).—18 H. chimani sp. n. (typus).—19 H. oromialis sp. n. (typus). Scale 0.5 mm.

FIGURES 40–41. Structure of female clypeus.—40 H. tinctulus Cockerell.—41 H. melanosoma (Cockerell).

FIGURES 140–143. H. (Deranchylaeus) tinctulus Cockerell: head in frontal view and surface structure of basal terga.—140, 141 Male.—142, 143 Female. Scale 0.5 mm.