157 
ginato ; abdominis segmento primo fortiter transverso 
antice verticali ; segmento secundo vix tuherculato-elevato^ 
postice hand rufo-marginato. 
Long. (? ? 11 mm. 
Head closely set with large but shallow punctures ; thorax 
punctured much as the head, but with the punctures 
becoming more sparing backwards, the metathorax 
strongly rugose ; of the hind body the first segment 
is rather closely and strongly punctured, very trails- 
verse and somewhat abruptly vertical in front, the 
second segment has fine and deep punctures at the 
base which become gradually larger and shallower 
towards the apex; the segment itself only slightly 
approaches the tubercular form, but viewed from the 
side is seen to have a decidedly greater longitudinal 
convexity than the rest ; the following three segments 
are punctured much as the apical part of the second. 
The insect is black with the following parts red : the 
mandibles, a spot between the eyes, the tegulse, two 
spots below the tegulse, the scutellum, the post scut- 
ellum, the first segment of the hind body, a large 
spot on either side of the second segment. These 
markings are probably variable, as some of them, in 
one or other of my two specimens, are more or less 
obscured with black spots or clouds. The wings are 
shining fuscous without any coloured iridescence. 
The legs are blackish, with shining fuscous pubescence. 
The apical joint of the antennae in the male is obscurely 
testaceous. 
Very closely allied to 0. ruhritinctus, Sm., but differs in 
the colour of the wings and in the absence of a red 
hind margin to the second segment of the hind body. 
Of 15 specimens of 0. rubritincUis in my collection 
not one varies in either of these respects. 
Occurred on Kauai in August, 
