Leioproctus (Leioproctus) macmillani, * Houston, 1991

Maynard, Glynn Vivian, 2013, Revision of Goniocolletes and seven Australian subgenera of Leioproctus (Hymenoptera: Apoidea: Colletidae), and description of new taxa, Zootaxa 3715 (1), pp. 1-114 : 44

Leioproctus (Leioproctus) macmillani species-group

Leioproctus (Leioproctus) macmillani Houston was named as an aberrant member of the subgenus because of extraordinary long malar areas of both sexes and modified antennal flagella of males. Both of these characters are found in a species here described and placed with L. (L.) macmillani in this species-group. The shape of the flagellar segments is considered convergent with those of L. (Cladocerapis) bipectinatus ; other examples of males from different groups having similar types of antennal flagella modifications occur within Leioproctus . The 2 species that occur in this group are from central and Western Australia. None has yet been found in eastern Australia.

This species-group has characters in common with at least 2 subgenera of Leioproctus ; it shares similarities with Leioproctus (Cladocerapis) both male and female. The females of both of these groups have spines on the fore basitarsi—those in female Leioproctus (Cladocerapis) are dorsal whereas those in L. macmillani are ventral with stiffened hairs dorsal and polished space between anteriorly, which forms a corbicula-like area; the similarities are quite superficial. Leioproctus (Filiglossa) females also have thickened spines on the distal dorsal fore basitarsus.

Leioproctus (Nesocolletes) , found only in New Zealand, also have an enlarged malar space. This subgenus is densely hairy as is the L. (L.) macmillani species-group, but females have no teeth on the inner hind tibial spur and the hind tibial scopa is densely plumose. Male S7–8 and genitalia of both groups are quite different.

Diagnosis— Ocellocular area strongly depressed, malar space at least as long as the width of the base of the mandibles; males very hairy.

Key to species in Leioproctus (Leioproctus) macmillani species-group

- Malar space greater than one and half times width of base of mandible... Leioproctus (Leioproctus) macmillani Houston, 1991 - Malar space less than one and half times width of base of mandible...... Leioproctus (Leioproctus) crinitus Maynard, sp.n