1970] 
Evans — Spider Wasps 
305 
Fig. 1. Iridomimus violaceus new species, holotype (setae omitted). 
appear to be so rare. I have scanned the collections of Pompilidae 
in all the major museums of Australia, but I have been unable to 
find additional specimens of these or related species. 
Iridomimus, new genus 
Type species: Iridomimus violaceus, new species. 
Generic diagnosis (females only; males unknown). — - Front wings 
in the form of a stalk much longer than the terminal, expanded 
portion, the latter with or without one or two short veins, these 
wings not extending beyond the base of the second metasomal tergite ; 
hind wings minute, not surpassing the postnotum. Postnotum trans- 
versely striate, unusually long, approximately as long as the very short 
scutellum and metanotum combined; thoracic profile markedly con- 
stricted at the postnotum and at the mesopleura, so that the meso- 
soma appears to form two separate nodes both in dorsal and lateral 
views; mesoscutum also unusually small; pronotum large, rounded, 
constricted behind, with no evidence of a furrow extending laterad 
from the collar; mesopleura slender, the transverse furrow weak to 
virtually absent, located only a short distance from the top. Legs 
very slender and with only a few short spines, front tarsus with no 
evidence of a pecten, middle and hind tibiae with a few weak spines 
along the shaft and a few short apical spines which are somewhat 
splayed out; claws dentate. Second sternite of metasoma with a 
transverse furrow, apical tergite strongly setose but without thick 
bristles. Head without unusual features, clypeus transverse, truncate, 
antennae long and slender, base of mandibles slightly separated from 
bottoms of eyes; eyes convergent above, their inner margins not at 
all emarginate; ocelli well developed. 
