Hylaeus (Pumilaeus) pumilus, Dathe, 2015

Dathe, Holger H., 2015, Studies on the systematics and taxonomy of the genus Hylaeus F. (9) Supplement to the taxonomy and distribution of Afrotropical Hylaeus F. species (Hymenoptera: Anthophila, Colletidae), Beiträge Zur Entomologie = Contributions to Entomology 65 (1), pp. 9-26 : 23-24

Hylaeus (Pumilaeus) pumilus spec. nov.

Figures 18–21 , 25

Diagnosis: This is a small dainty species, possessing special characters in male terminalia (see above).

Description: Male. – TL 4.65 mm, WL 2.95 mm.

Head. Proportions HL:HW 0.89, UFW:LFW 1.91, outline transverse trapezoid. Scapus short, conical, as wide as flagellum, SL:SW 1.7; predominantly white-marked, only the back blackish; flagellum short, yellow, darkened above. Mask ivory white, complete. Foveae faciales indistinct, only recognizable on vertex as a smooth line. Clypeus CL:CW 1.38, silkily shining, with moderate, dense punctation; supraclypeal area with oval impression above, dorsally rounded. Pilosity on frons and vertex very sparse, punctation moderate, subcontiguous with smooth interspaces. Occiput edged, malar areas narrow. Labrum and mandibles black.

Mesosoma. Shape relatively short, compact. Pilosity sparse, short, only at seams between mesonotum, scutellum and metanotum with white felt. Black with bright marks on pronotum, calli and tegulae. Pronotum with white line, narrow, not expanded; anterior margin rounded, posterolateral angle blunt. Mesonotum shagreen, silkily shiny, punctation fine, contiguous to subcontiguous, scutellum with somewhat more scattered punctation, shiny; mesopleura also shagreen, silkily shiny, and punctation more scattered than mesonotum. Sculpture of metanotum other than mesonotum and scutellum, similar basal area with wrinkled meshes. Legs black; bright are the femur tips, tibiae and entire tarsi. Wings hyaline, venation brown. Propodeum rounded, basal area delimited by carina, surface with sharply defined wrinkles; terminal area only laterally and ventrally with sharp margins, on surface with fine wrinkled sculpture, median sulcus expanded like a funnel above.

Metasoma slender, spindle-shaped, surface with short and close white hairs; coloration black. Sculpture of T1 smooth and shiny, with fine, subcontiguous to dense punctation; punctation of following terga still finer, flat and densely punctate. T1 with narrow white lateral fringes. Terminalia see Fig. 25 and description above.

Female. – TL 5.2–5.3 mm, WL 3.6–3.8 mm.

Head. Proportions HL:HW 0.86–0.87, UFW:LFW 1.52, outline transverse-elliptic. Scapus black. Flagellum long, yellow, darkened above. Face markings ivory white, paraocular markings filling lateral parts of face, extended above to foveae. Foveae faciales expanded to vertex, strongly converging. Clypeus CL:CW 1.02–1.06 (1.04), shagreen, matt, with dense flat punctation. Supraclypeal area relatively flat and wide, merging above with stripes/ grooves onto forehead. Frons and vertex with moderate, subcontiguous punctation. Genae and occiput regular, malar areas narrow. Labrum and mandibles brown, mandibles bifid.

Mesosoma compact; pilosity dorsally very short, closely adpressed, ventrally long and erect; pronotum with bright stripe, calli and tegulae with spots. Pronotum not expanded, dorsolateral angle rounded. Mesonotum with fine, dense punctation, intervals shagreen, silkily shiny. Scutellum with more scattered punctation, shiny; mesopleurae shagreen with moderate, close punctation. Sculpture of metanotum with wrinkled meshes, similar to basal area of propodeum. Legs black, bright are tibial bases outside and apical tarsi. Wings hyaline, venation brown. Propodeum rounded, matt; basal area delimited by sharp reticulate wrinkles, shiny; terminal area with sharp edges only laterally below, surface shagreen, matt, with white hairs; medial furrow smooth, expanded above.

Metasoma shape compact, spindle shaped, coloration black but base of T1 ferruginous, surface covered with short white pubescence. Sculpture of T1 smooth and shiny, with fine, dense punctation, becoming denser toward the apical margin; following terga with very minute shallow punctation; T1 to T3 with narrow white lateral fringes and interrupted white hairband on depression. Terminal ventral fringe pale.

Distribution: Cameroon.

Type material: 1 ♂, 2 ♀.

Holotypus: ♂ Cameroon: N Mindif, bord Mayo Boula , 10°27'N 14°25'E, 30.07.1987, A. Pauly lg. – In coll. RBINS .

Paratypes: Cameroon: same data as holotype, 2 ♀, A. Pauly leg. – In coll. RBINS, SDEI .

Flower visit: On flowers of Cassia sp. (Fabaceae) , record by A. PAULY.

Derivatio nominis: The species (and subgenus) name is derived from pumilio (lat.) – dwarf and refers to the dainty shape of the new species. The term is used adjectivally, as it has been defined by the principles of zoological nomenclature since LINNAEUS in 1758.

terga in dorsal view. – 18, 19 Typus male. – 20, 21 Paratypus female. – Scale 1 mm.

Figures

Figs 18–21: Hylaeus (Pumilaeus) pumilus spec. nov.: head in frontal view and surface structure of basal

Figs 22–25: Male terminalia: metasomal sterna 7 and 8 (S7, S8), genital capsule. – 22 Hylaeus (Alfkenylaeus) euphorbiae spec. nov. – 23 Hylaeus (Cornylaeus) adamauanis spec. nov. – 24 Hylaeus (Deranchylaeus) haladanius spec. nov. – 25 Hylaeus (Pumilaeus) pumilus spec. nov., S7: left ventral view, right dorsal view. – Scale 0.2 mm.