126 CALIFORNIA ACADEMY OF SCIENCES. 



ginous, the tips margined with fuliginous, the hind pair 

 with the anal area black; head and thorax opaque, closely 

 punctate; scutellum, femora and abdomen shining. 



Head transverse, a little narrower than the thorax with 

 the face produced; e3'es slightly emarginated within; face 

 closely, evenly punctured, wnth a median carina extend- 

 ing from between base of antenna?, where it is highest, 

 forward on to the clypeus, where it becomes obsolete; 

 labrum produced; mandibles black, with two yellow spots 

 more or less confluent at base; palpi black; antenna? ex- 

 tending to apex of petiole of abdomen. 



Thorax without furrows, the scutellum deeply impressed 

 at base and connected with the mesonotum by lateral 

 cariniE, posteriorly rounded, shining, but still punctate; 

 meta thorax opaque, finel}' rugose, the posterior face with 

 a slight median impression, but wath no distinct carina?. 



Abdomen shining, much compressed, the segments 

 after the third microscopically aciculated, but still shining. 



Described from one ? specimen from El Taste, at an 

 altitude of 3,400 feet (Eisen). 



This is one of the most beautiful species yet discovered 

 in this genus, and evidently mimics some of the spider- 

 killing wasps (Pompilus and Pepsis) so common in 

 Mexico. 



Opmion Fabricius. 



II. Opiiion subfuliginosus sp. n. 

 S , ? . — Length 12 to 14 mm. Brownish-ferruginous; 

 wings cinereous, subf uliginous toward apex, the stigma 

 brownish yellow, the internal nervures black or blackish; 

 mandibles at tip black. 



Head transverse, polished, impunctate, except face and 

 clypeus, which are rather closely punctate; eyes dis- 

 tinctly emarginated within; ocelli large, the lateral touch- 

 ing the eye margin; clypeus truncate anteriorl}-, well 



