Vot. II, Part IT] WILLIAMS—BEES AND WASPS 351 
dark apically; compound eyes nearly black; ocellus enclosing 
a blackish area; legs very pale, almost straw color; wings 
hyaline; stigma brown. Head smooth, only sparsely punctate ; 
antennz with article three shorter than four, which is about 
equal to five; right mandible with one rather reduced and two 
distinct, apical teeth, left mandible with two distinct apical 
teeth, the inferior one the longer ; inferior margin of mandibles 
notched about mesad so that the basal is wider than the apical 
portion; clypeus gently rounded out at the sides, then con- 
tinuing towards the transverse middle portion as a nearly 
straight line; the middle portion with a small tubercle on either 
side. At the middle base of the clypeus is a large rather low 
tubercle. Thorax shining with rather large well separated 
punctures ; forewings with the third submarginal and the third 
discoidal cells incomplete on the outer side; stigma fairly large; 
venation of hind wings quite indistinct. Propodeum with 
rather large though not coarse reticulations, a few of the 
transverse carinulz lacking mesad towards base; at each side 
at the distal end the propodeum is armed with a rather fine 
spine. First abdominal segment (pedicel) smooth, about three- 
fourths as long as the hind femora; its base flaring laterally 
into a spine; dorsally it is well arcuate, laterally gently, while 
its ventral profile is nearly straight and smooth, only slightly 
punctuate (for reception of hairs). At the apex, which is not 
constricted, the pedicel is about two times as wide as at base. 
The insect is sparsely clothed with pale erect hair; antennz 
with very short pile. A male paratype is about 8 mm. long, 
and another of the same size lacks the head. The ocelli of the 
males of these nocturnal insects are very large. The females 
are apterous and not commonly taken. They are most abun- 
dant in arid or semi-arid regions with warm summers, and 
frequently come to light in large numbers. 
Type: Male, No. 1870, Mus. Calif. Acad. Sci., taken by 
F. X. Williams, November, 1905, on South Seymour Island, 
a low, dry bit of land near Indefatigable Island. Paratypes, 
two males, same data. 
