164 
The male has the following parts yellow, viz. : — The 
clypeus (wholly or in part) ; the front of the scape 
and the apical joint of the antennse ; some spots on 
the prothorax, on the tegulse and on the tibiae ; and 
the dorsal hind margin of the basal two segments of 
the hind body. Some or other of these markings are 
wanting in most specimens, but I have seen none in 
which the clypeus is not entirely (or very nearly so) 
of a bright yellow colour. The female is quite devoid 
of colour save that in some specimens the apical dorsal 
margin of one or both of the basal two segments of 
the hind body is obscurely testaceous. 
This insect occurs on the sandy isthmus forming the 
middle of the island Maui, and on the adjacent lower 
slopes of Haleakala. 
N.B. — I possess a single 3 specimen of an Odynerus cap- 
tured on Oahu which is probably distinct from the 
species last described, but is too closely allied to be 
treated as new without the examination of a series of 
examples — especially in consideration of my know- 
ledge of the extent to which the coloured markings 
of the Hawaiian Odyneri vary. It has all the yellow 
markings of a cJ insulicola (except those on the 
flagellum), with the addition of the following, — a 
spot on the head behind the base of the antennse, the 
scutellum and post scutellum, and a large spot below 
the tegulse. The posterior margin of the basal seg- 
ments of the hind body is more broadly yellow ; the 
basal segment itself appears a little more strongly 
transverse and the punctuation of the whole insect a 
little more sparing. 
crabronidh:, 
Crabro. 
As it seems desirable to furnish some further remarks on 
the species of this genus already described, I think it will be 
