﻿CAMERON. SOME ODYNERINAE OF THE SOUTHWESTERN UNITED STATES 127 



shaped with a short neck, the second is, if anything, wider than long, nar- 

 rowed at the base, the apex reflexed. Wings hyaHne, tinged with violaceous ; 

 the basal nervures, costa and stigma, testaceous, the apical nervures blackish. 

 Allied to O. sapelloensis Cam., but that species may be known by the 

 second abdominal segment being clearly longer than wide, by the yellow basal 

 line being enclosed, not open, by the apical part of the black mark on the first 

 abdominal segment being narrower and broader on the projecting sides, by 

 the black mark on the second ventral segment being larger, having a larger 

 more rounded incision on the sides, and the apex having a broad rounded 

 incision. 



Odynenis viereckii n. sp. 



Black, the clypeus, base of mandibles, a triangular frontal mark (the nar- 

 row end below and with a short pedicel), the eye incision, the greater part of 

 the outer orbits, the basal half of pronotum, sides of scutellum, postscutellum, 

 a broad conical spot below the tegulae, the sides of the first abdominal segment 

 from the top of the basal slope, its apex more narrowly, the second segment 

 except a large broad mark on the center of the basal two-thirds (this mark 

 has the basal half obliquely narrowed, the narrowed apical part of equal width), 

 and all the rest of the abdomen pale orange yellow. Legs fulvous, the under- 

 side of the coxae pale yellow, the upper black, the apex of the femora and of 

 the tibiae in front, yellow. Antennal scape rufous. The center of the clypeus 

 tinged with rufous ; the apical half of pronotum, the center of the scutellum 

 broadly, the upper edges of the sides of metanotum broadly, and a broad band 

 bordering the sides of the black spots on the center of the first and second 

 abdominal segments, rufous. Wings fulvo-hyaline, the apex slightly infus- 

 cated, the nervures blackish, the costa and stigma fulvous. Female. Length 

 12 mm. Claremont, California (Baker). 



Clypeus as wide as long, the upper half strongly but not closely punc- 

 tured, the lower flat with scattered punctures ; the apex broad, transverse, 

 furrowed behind. At the end of the vertex in the center, there is a smooth 

 transverse curved space roundly dilated behind, and with a curved trans- 

 verse depression on the hinder half. Base of thorax transverse, the apex 

 laterally becomes gradually widened from the top and bottom to the middle ; 

 the center of the apex is roundly depressed and closely transversely striated. 

 The puncturation is strong and close, and on the pleurae running into reticu- 

 lations. First abdominal segment smooth, cup-shaped, the second slightly 

 longer than wide, sparsely weakly punctured, the apex strongly punctured 

 with a smooth reflexed border, the other segments are much more coarsely 

 punctured, the ape.x of the third is strongly reflexed. 



This species might be taken for a form of annulatus hut may readily be 

 known by the reflexed borders of the second and third segments, by the 

 fulvous tinted wings and by the longer second abdominal segment. 

 Odynenis trichiosomus n. sp. 



Black, the clypeus, mandibles except the teeth, labrum, a mark over the 

 antennae (broad and transverse above, the lower part of it obliquely roundly 



