158 
2S.^0dyneeus montanus. 
Odynerus montanus, Smith, l.c.^ p. 680, 
Common on Mountains of Oahu. 
29.— Odynerus cardinalis. 
0. cardinalis, sp. nov. Bobustus ; nitidus; parum 
puhescens ; perniger, alis splendide purpureis ; capita 
fortius confertim, thorace sparsim suhtilius, punctatis; 
clypeo vix emarginato ; ahdomine sparsim subcequaliter 
punctata, segmento primo fortiter transverso antice haud 
verticali, segmento secundo vix tuberculato-elevato. 
Long $ 9 mm. $ 12—14 mm. 
Though not a large insect, nor structually isolated, this is 
by far the handsomest of the Hawaiian Odynerv 
The body is of a deep shining black, the wings of a 
really gorgeous purple colour. The head is closely 
and deeply punctured, but the punctures are small. 
The whole thorax is brightly shining, the punctuation 
on the prothorax and metathorax being far from 
crowded, that on the scutellum . extremely sparing ; 
the metathorax is almost impunctate, and is quite 
smooth. The hind body is brilliantly shining, 
sparingly set with fine punctures, which are rather 
evenly distributed, but become a little coarser near 
the apex. The first segment is very strongly trans- 
verse, and, viewed from the side, its upper outline 
forms a continuous gently rounded ascent from the 
petiole to the apical margin, no part being at all 
vertical. The second segment has but little indica- 
tion of tendency to a tubercular form. The apical 
joint of the antennae in the male is obscurely tes- 
taceous. 
The nearest ally of this insect is 0. montanus, Sm., from 
which it may be at once distinguished by the richer 
colouring of the wings, the smooth metathorax, and 
