153 
rubbing would account for. The length of these 
males is 13 mm. Their differences from the female 
do not seem to call for remark, being only the usual 
structural differences. The small apical joint of their 
antennae is of a testaceous colour. 
22. — Odynerus hawaiiensis. 
0. hawaiiensis, sp. nov. Minus rohustus ; suhopacus ; 
suhtiliter puhescens ; niger, mandihulis rujis, alis viola- 
ceis ; clypeo vix emarginato ; capite ahdomineque obscure, 
thorace vix evidenter, punctatis; abdominis segmento primo 
vix transverso antice subverticali, secundo tuberculato- 
elevato. 
Long. (? 12 mm. ? 13 13-13J mm. 
Rather an obscure looking species. The head is some- 
what closely punctured, but the punctures are faintly 
impressed ; the rest of the trunk appears impunctate 
but opaque ; when examined with a lens, however, 
it is seen to have a double system of punctuation, 
but it is all so faintly impressed as to be hardly 
noticeable. The metathorax is delicately alutaceous 
rather than punctured. The basal segment of the 
hind body is about as long as its greatest width, is 
somewhat (but not abruptly) vertical in front, and is 
thickly covered with large shallow punctures; the 
next two segments have fine punctures in front and 
large ones behind; the remainder (except the last) 
are coarsely but not deeply punctured. The apical 
joint in the antennae of the male is testaceous. 
Allied to 0. vulcanus this species is easily dis- 
tinguishable by its mandibles, more or less red, and 
by the shape of the first segment of the hind body, 
which is especially noticeable if looked at from the 
side, when it is seen to be longer (from the apex of 
the petiole) than high, whereas the proportion is 
reversed in 0. vulcanus. 
