Hylaeus (Alfkenylaeus) SNELLING, 1985

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 : 14

Key to species of the subgenus Hylaeus (Alfkenylaeus) SNELLING

Modified from SNELLING (1985: 13–14).

1 Female, antenna 12-segmented ......................................................................................................................................... 2

– Male, antenna 13-segmented ............................................................................................................................................. 6

2 Apical protarsal segment broadest at apex, evenly narrowed toward base; bristles of protarsus slightly or not at all flattened, their apices acuminate; T1 and T2 with close, coarse punctation ............................................................... 3

– Apical protarsal segment narrowest basad, broadened to basal one-third, evenly narrowed apicad; protarsal bristles strongly flattened, apices bluntly rounded; T2 either without evident punctation or punctation fine and scattered ..................................................................................................................................................................... arnoldi (FRIESE)

3 Clypeus entirely black; legs brownish, metatibiae with basal one-third more or less yellowish; T2–T5 with conspicuous preapical pubescent fasciae ................................................................................................................................................ 4

– Clypeus largely ferruginous; legs entirely ferruginous; T3–T5 with short, inconspicuous hairs, a little denser on side of T1 and T2 ............................................................................................................................ acariphorus SNELLING

4 Punctation along middle of clypeus fine to moderate, separated by one-half, or more, puncture diameters; pronotum maculate; hairs on basal face of T1 long, fully erect, and continuous across summit ....... stictifrons (COCKERELL)

– Punctation along middle of clypeus coarse, contiguous to subcontiguous; pronotum unmarked; hairs on basal face of T1 subappressed and limited to margin of sulcus, none across summit ................................. infulatus SNELLING

5 Clypeus entirely pale or pale with apical area ferruginous; lateral face mark filling most of space between complex eyes and clypeus; thorax often dull, punctural interspaces densely tessellate ............................................................. 6

– Clypeus black on upper two-thirds, apical one-third ferruginous; transverse stripe between antennal sockets and clypeal base yellowish; thoracic interspaces shiny, polished on dorsum ........................... psaenythioides SNELLING

6 Sternum 3 flat, without mediobasal glabrous swelling; base of metatibia and entire metatarsus whitish .............. 7

– Sternum 3 with low, semicircular glabrous swelling at base; legs wholly ferruginous .......... acariphorus SNELLING

7 Lateral face marking ending at level of upper margin of antennal sockets; scape with white stripe beneath ........... ................................................................................................................................................................... arnoldi (ALFKEN)

– Lateral face marking ending midway between antennal sockets and top of eye; scape unmarked beneath ........... 8

8 Gonoforcipes of genital capsule with gonostyli ...................................................................... stictifrons (COCKERELL)

– Gonoforcipes of genital capsule without gonostyli ..................................................................... euphorbiae spec. nov. otherwise rounded, dorsolateral angle blunt. Mesonotum and scutellum shiny, very finely shagreen, with strong, sparse punctation; metanotum matt; mesopleura smooth and shining, with strong, close punctation. Legs black, bright basally on tibiae, frontally on foretibiae and whole of tarsi. Wings hyaline, venation brown. Propodeum rounded, evenly domed, its surface wrinkled, dull; basal area delineated by fine carina, surface reticulate-wrinkled; terminal area not delimited, medial furrow short, flatly extended above.