552 CALIFORNIA ACADEMY OF SCIENCES. 



pedicel is half as long as the first joint of funicle very 

 little longer than thick at apex; funicle 5-jointed, without 

 counting the single ring-joint, the first joint being the 

 longest, or fully twice as long as thick, the following very 

 slightly decreasing in length so that the fifth joint is only 

 slightly longer than thick; club 3-jointed, a little shorter 

 than the scape. The pronotum seen from above is almost 

 as long as the mesonotum, the scutellum to its tip being 

 considerably longer than the mesonotum. Metanotum 

 medially sulcate, the sulcus having two delicate parallel 

 carina, the space between them being filled with delicate 

 transverse raised lines. Marginal vein of front wings 

 rather stout, i^ times as long as the stigmal, the latter a 

 little shorter than the postmarginal. 



Abdomen subsessile, not longer than the thorax, blunt 

 at apex,, the fifth segment the longest, about 2^ times as 

 long as the fourth, the sixth about half the length of the 

 fifth, the seventh a little longer than sixth, bearded with 

 white hairs and bearing spiracles, the eighth segment re- 

 tracted. 



Described from one ? specimen from Tepic. 



EvoxYSOMA Ashmead. 



31. -EvOXYSOMA DECATOMOIDES Sp. n. 



S . — Length 2.5 mm. Black; face, orbits, streak be- 

 hind ocelli, prosternum, middle lobe of mesonotum pos- 

 teriorly the axillae and the scutellum, brownish -yellow; 

 basal half of scape, palpi and legs, white; flagellum 

 black; wings hyaline, the veins pale brownish, the post- 

 marginal vein a little longer than the marginal, or more 

 than twice as long as the stigmal. The head is wider 

 than the thorax, with large prominent eyes, the occiput 

 deeply roundedly emarginate, while the face has a deep 

 antennal emargination. The flagellum is long, filiform, 



