Hylaeus (Deranchylaeus) oromialis, Dathe, 2014

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 : 56-58

Hylaeus (Deranchylaeus) oromialis sp. n.

Figures 19 , 110–113

Diagnosis

This species is of the tinctulus-group. The male is well characterized by the transversely truncate mask and the short genital capsule. In general it is similar to H camerunensis sp. n. The female is difficult to determine as are most of the females in this species group.

Description

Male. TL 4.4–5.0 (4.62) mm, WL 3.6–4.0 (3.74) mm.

Head. Proportions HL:HW 0.96, UFW:LFW 1.90; outline transversely elliptical. Face strongly converging below, in middle bulged, frons retreating. Scapi black, conical expanded, at end wider than flagella, SL:SW 1.83; flagella long, black, yellow below. Mask ivory white, complete, white patches transversely truncated above at height of scapi bases, rounded at orbits. Foveae faciales clearly, short. Clypeus CL:CW 1.80, shagreen, matt, punctation fine, scattered. Supraclypeal area formed channel-like above. Frons shiny, scapus field without punctation, laterally with wrinkle-streaked punctation, below and on vertex with strong, subcontiguous punctation. Pilosity with scattered erect white hairs, head underside dense and long haired. Genae, occiput and malae normal. Labrum and mandibles black.

Mesosoma depressed; pilosity pronounced, white, especially ventrally and laterally, including propodeum, white toment stripes on posterior margin of pronotum. Pronotum, calli and tegulae entirely black. Pronotum slightly expanded forward; anterior margin in middle sharp, sides sloping outwards. Mesonotum, scutellum and mesopleurae shagreen, matt, punctation strong, close. Legs black, bright are foretibiae in front, mid and hind basitarsi; wings hyaline, venation black. Propodeum edged, matt; medial area transversely impressed, with longitudinal ridges, distally delimited by an irregular carina; terminal area with sharp lateral margins, continued to lower edges of lateral areas, surface coarsely punctate, its median sulcus deep, widened upwards to edge of medial area.

Metasoma stocky spindle-shaped, black. T1 shagreen, silky shining, punctation fine, sparse; T2 with minute, sparse punctation, punctures shallow; following terga shagreen, punctation very indistinct or absent. T1 with narrow white lateral fringes. Terminalia ( Fig. 19 ): genital capsule short and compact, gonoforcipes and penis valves approximately same length; S8 anterior margin deeply emarginate; S7 proximal lobi with 3 comb teeth.

Female. TL 5.2–5.5 (5.32) mm, WL 4.0–4.2 (4.10) mm.

Head. Proportions HL:HW 0,97, UFW:LFW 1,12, outline almost circular, vertex somewhat raised. Scapi black; flagella short, below yellow, top black. Face black except two tiny spots below foveae. Foveae faciales prolonged up to vertex. Clypeus CL:CW 1,40, shagreen, matt, punctation fine, sparse, punctures small, but clearly circumscribed. Supraclypeal area above and frons next to frontline contiguously punctate. Frons shagreen, matt, punctation shallow moderate, subcontiguous to dense, vertex above contiguous. Genae and occiput normal, malae narrow. Labrum and mandibles black.

Mesosoma long, depressed; pilosity clear, especially ventrally and laterally, projecting long white hairs, also on metanotum and propodeum. Pronotum at posterior margin white tomentose. Pronotum, calli and tegulae black. Pronotum laterally expanded forward, anterior margin in middle with sharp edge, sides sloping outward. Mesonotum and scutellum shagreen, matt, punctation moderate, close; mesopleurae shallower punctate than mesonotum; mesepisternum rounded in front. Legs entirely black; wings hyaline, venation black. Propodeum rounded, matt; medial area transversely impressed, basally a shiny row of meshes, apically delimited by coarse irregular carina; terminal area matt, side margins sharply below, surface finely sculptured and punctate, median sulcus deep, expanded upward to a triangular shagreen field.

Metasoma compact, spindle-shaped; black. T1 finely shagreen, shiny, punctation fine, sparse; following terga increasingly rough shagreen and finer punctate. T1 with narrow white lateral fringes, T2 and T3 with broadly interrupted end bands. Fringe of last sternum yellowish.

Distribution

Ethiopia.

Type material: 3 ♂, 5 ♀

Holotypus: ♂ ETHIOPIA. Oromia: Holeta, 09.04N 38.30E, 2450 m, 01.01.2011, Zewdu & Pauly lg.—In coll. RBINS Brussels.

Paratypes: ETHIOPIA. Oromia: Muketuri, 09.33N 38.52E, 07.10.2010, 1 ♂, 3 ♀; Holeta, 09.04N 38.30E, 2450 m, 01.01.2011, 1 ♂, 2 ♀, all Zewdu & Pauly lg.—In coll. RBINS Brussels, HBRC Addis Ababa, SANC Pretoria, SDEI Müncheberg.

Derivatio nominis

The name is an adjective and refers to the Oromia Region, a regional state of Ethiopia, where the new species was collected.

Flower visit

On flowers of Amarante sp., Brassica sp. , Ruta chalepensis , Echium plantagineum (Zewdu & Pauly, label record).

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 110–113. H. (Deranchylaeus) oromialis sp. n.: head in frontal view and surface structure of basal terga.—110, 111 Typus male.—112, 113 Paratypus female. Scale 0.5 mm.