268 CALIFORNIA ACADEMY OF SCIENCES. 



pubescence, strongly furrowed down the middle, how- 

 ever, sides shining, delicately striato-punctate; abdomen 

 long and slender, first segment subnodose at apex, fully 

 one -third longer than the second, second and third seg- 

 ments united about one -quarter longer than the first. 

 Black; mandibles, darker apically, greater part of fore 

 tibiae, their tarsi and a ring at base of middle tibiae, not 

 always present, however, reddish -yellow, sides of the 

 second, third and fourth abdominal segments basally red- 

 dish ; tegulas pale testaceous ; calcaria whitish ; wings 

 hyaline throughout, iridescent, nervures and stigma black, 

 space between the recurrent nervure and the transverso- 

 cubital nervure on the cubital vein distinctly greater than 

 the width of the submarginal cell at apex; clypeus, head 

 in front, including the eye-emarginations, cheeks, and 

 thorax beneath less densely, with silvery pubescence. 

 Length, 9 mm. 



San Jose del Cabo. Two specimens. Distinct by the 

 longitudinal ridge of front, sculpture of middle segment 

 above, clear wings, shape of clypeus, coloration, and po- 

 sition of ocelli, which are not connected by a furrow. 

 Its form and coloration is similar to those species with 

 the middle segment trisulcate above, but in this there is 

 but one sulcus. It is evidently more clearly related to 

 frigidiiTn and bidentatam. 



EUMENID^. 



Odynerus dorsalis Fabr. Tepic. One specimen 

 representing the red variety of this species. 



Odynerus fusus Cress. San Jose del Cabo. One 

 specimen. Differs from Texan examples by having the 

 truncation of the clypeus a little narrowed, and abdomen 

 more suffused with yellow. 



Odynerus lacunus Fox. San Jose del Cabo. One 

 ? specimen. 



