10 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. (51. 



tudinally tricarinate above and weakly rugulose between the carinae, 

 abdomen beyond the petiole siibcylindrical and polished; whole ab- 

 domen equal to approximately two-thirds the length of thorax and 

 much narrower than the thorax. Color as in the female except that 

 the legs are entirely black, the pronotal pale spots are not so con- 

 spicuous though present, and the marginal and stigmal veins are 

 fuscous. 



Type locality. — Elk Grove, California. 



Type.— C2it. No. 24986, U.S.N.M. 



lype female and ten female paratypes from the type locality, 

 reared April 22, 1921, by B. G. Thompson from stems of Lol'ium 

 temulcntum Linnaeus, and recorded under Sacramento No. 20248. 

 Allotype male, a male paratype and thirteen female paratypes from 

 Bird's Landing, California, reared April 20, 1921, by the same 

 collector from the same host plant, and recorded under Sacramento 

 No. 20292. Also six female paratypes reared b3'' the same collector 

 April 21, 1921, from Lolium multifonim Lamarck, collected at the 

 last named locality, and recorded under Sacramento No. 20294. 



Mr. C. M. Packard, in charge of the Bureau of Entomologj^ Lab- 

 oratory at Sacramento, California, has furnished an interesting sum- 

 mary- of notes on the species made by himself and Mr. Thompson. 

 According to this summary the species is certainly phytophagous. 

 Green and succulent stems of Lolium teimdeyitum collected May 22, 

 1918, were heavily infested. Almost every stem contained one or 

 two of the larvae which hollow out elongate oval cells in the center 

 of the stem. Messrs. Packard and Thompson are not yet sure of 

 the life cycle but state that such scattered observations as they have 

 been able to make indicate that the species has but one generation 

 a year, the adults emerging from the previous year's growth early 

 in spring, ovipositing in the young grass of the current season, the 

 larvae maturing in early summer and remaining quiet in the stems 

 either as larvae or pupae until the following spring. 



Family PTEROMALIDAE. 

 Genus POLYSCELIS (Ashmead) Dalla Torre. 



As represented by P. wehsten Ashmead and the new species here 

 described, this genus very closely resembles Eupteromalus Kurdju- 

 mofP, but may be distinguished by the immargined occiput, the more 

 distinctly hairy dorsal surface of the hind coxae, and the more or 

 less compressed and expanded apical half of the middle tibiae of the 

 male. 



The two American species may be separated as follows : 



1. Females 2. 



Males 3. 



