Leioproctus Subgenus Colletellus Michener, 1965

Leijs, Remko, Dorey, James & Hogendoorn, Katja, 2018, Twenty six new species of Leioproctus (Colletellus): Australian Neopasiphaeinae, all but one with two submarginal cells (Hymenoptera, Colletidae, Leioproctus), ZooKeys 811, pp. 109-168 : 114-115

Leioproctus Subgenus Colletellus Michener, 1965

Leioproctus (Colletellus) Michener, 1965: 70.

Type species.

Andrenopsis velutinus Cockerell, 1929 (not Paracolletes velutinus Cockerell, 1929, homonym in Leioproctus ) = Leioproctus velutinellus Michener, 1965, by original designation.

Diagnosis. Two submarginal cells. Jugal lobe of hind wing extending well beyond level of cu-v. Antennal scape short, not reaching median ocellus. Facial fovea absent.

Description. The original description of L. (Colletellus) by Michener (1965), based on the type species L. velutinellus is no longer accurate with the addition of numerous species to this subgenus. Body length of 5-6.7 mm; eyes converging below; clypeus not protuberant; facial fovea absent; scape short, not approaching level of anterior ocellus, antenna as a whole short, median segments of flagellum much broader than long, with the exception of L. aratus which has an elongated flagellum with median segments longer than wide; two submarginal cells, however some species show incomplete or complete additional submarginal cross veins; stigma large, not parallel sided, more than half of length of costal edge of marginal cell; jugal lobe exceeding cu-v; metanotum not tuberculate ; propodeum in profile with subhorizontal surface, curving onto vertical surface without sharp differentiation; inner hind tibial spur ciliate or pectinate; basitibial plate elongated and pointy or short and rounded; scopa plumose; claws cleft; metasoma in most species without distinct hair bands, but occasionally faint apical hair bands laterally, with the exception of L. aberrans and L. laciniosus which have distinct apical hair bands on T2-4; post gradular areas often depressed, especially in males, with orange-brown integumental colouring; large variation in the shape of male S7, especially with regard to the shape, the number of lateral lobes and the placement of setae.

The species in this subgenus are not difficult to identify because there are clear differences among species in integumental structure, especially on the clypeus, frons, scutum, metapostnotum and metasoma, as well as remarkable diversity of shapes of the male S7.