80 POMONA JOURNAL OF ENTOMOLOGY 



of the hind coxae, but in other respects it is very different. The species with 

 the coxae spined appear to have the first abdominal segment longer than usual, 

 e. g. 0. acanthopus Cam., and 0. austrinus Cr. O. austrinns Cr. has a dis- 

 tinct curved spine on the hind coxae, narrowed towards the apex. 



Odynerus blakeanus sp. nov. 



Black, the clypeus except narrowly around the apex and two small spots 

 in the middle, a small semi-circular mark on the front, a short line behind the 

 top of the eyes, underside of antennal scape, a large irregular triangular mark 

 on the base of the sides of pronotum, an irregular mark as large as the tegulae 

 at the base of mesopleurae above, a small irregular mark on the sides of the 

 scutelluni in the center, postscutellum, a small irregular mark on the sides of 

 the metanotum at the base, the first abdominal segment from the top of the 

 apical slope, an irregular mark on the sides of the second segment near the 

 base, the apices of the second to fifth segments somewhat broadly, the apices 

 of the second to fourth ventrals more narrowly, and the sides of the fifth, 

 lemon-yellow. The first abdominal segment is yellow from the top of the 

 apical slope, except for an irregular mark which at the base is slightly more 

 than one-third the width of the segment, beyond this dilated into a longish 

 line from the inner part of which it becomes gradually narrowed to a fine point, 

 which does not extend near to the apex. Apices of the femora broadly, and 

 the tibiae, yellow, the tarsi rufous. Wings smoky violaceous, more deeply so 

 in front than elsewhere, the nervures and stigma black. Female, length 12 

 mm. Lee county, Texas, April. 



Head and thorax densely covered with longish fuscous pubescence, closely 

 strongly punctured, the clypeus less closely than the rest of the head, and the 

 latter more closely than the thorax, the metapleurae opaque, bare, and alutace- 

 ous. Clypeus as long as wide, rounded above, the apex depressed, transverse. 

 Temples broad, rounded, not much narrowed. Base of thorax almost trans- 

 verse, the sides of the apex rough, almost margined, the center hardly de- 

 pressed, somewhat coarsely obliquely striated. Apex of postscutellum broadly 

 roundly narrowed and smooth. First abdominal segment large, cup-shaped, 

 the basal slope weakly and sparsely punctured compared with the apex in the 

 center of which is a narrow longitudinal furrow. The second segment is 

 slightly longer than wide, weakly punctured, the apex more strongly and closely 

 punctured, not reflexed, the third to fifth more coarsely punctured. 



Allied to O. arvcnsis Sauss. Apart from the differences in coloration — 

 the presence of a yellow mark on the sides of the second abdominal segment, 

 there being only two small marks on the clypeus, etc. — arvcnsis may be known 

 by the shorter second abdominal segment and by its being strongly depressed 

 and punctured in the center behind the apical line. The mandibles in blake- 

 anus are black save for a small yellow mark near the base ; in arvensis they are 

 for the greater part rufous. 



