4RT. 4. NEW PARASITIC HYMENOPTERA GAHAN. 9 



entire thorax, and middle and hind coxae, black; abdomen, except 

 at base, blackish or piceiis; antennae entirely, lower part of frons, 

 face, more or less of cheeks, front coxae, all femora, tibiae and tarsi 

 and transverse band at base of abdomen pale yellowish; wings 

 subhyaline. 



Male. — Unknown. 



Type-locality. — "WHiittier, California. 



Type.— C2it. No. 26177, U.S.N.M. 



Host. — Macrosiphutn solanifolii Ashmead. 



Described from nineteen card-mounted and five slide-mounted 

 specimens, apparently all females, reared from the potato aphid 

 by H. Compere, Februarj^ 20, 1922, and received by the Bureau of 

 Entomology from H. M. Armitage. Also two females taken at the 

 same place by E. A. Hartley, who first called the writer's atten- 

 tion to this form. 



APHEUNUS AUREUS, new species. 



Agrees very closely with automatus Girault but differs in its beau- 

 tiful bright orange color and in having the scutellum and posterior 

 half of the mesoscutum reticulated instead of shagreened. 



Femnle. — Length, 1 mm. Pedicel barely as long as thick; first 

 and second funicle joints small and transverse; third funicle joint 

 subquadrate; club approximately four times as long as the penul- 

 timate joint and somewhat thicker than usual. Mesonotum ante- 

 riorly granular, the posterior half and the scutellum reticulate, the 

 areas hexagonal or pentagonal and rather large; forewings moder- 

 ately broad, the marginal and submarginal veins subequal, disk of 

 wing distad of the hairless streak with moderately dense ciliation; 

 basad of the hairless streak with very sparse coarse cilia; abdomen 

 oval with the exserted portion of the ovipositor sheaths about equal 

 in length to the hind metatarsus. Eyes and ocelli dark; head, thorax 

 and abdomen bright orange or golden yellow but with a narrow 

 median line on the mesoscutum and scutellum and the sutures for 

 the most part paler; wings hyaline; the venation and the legs con- 

 colorous with the body or only slightly paler. 



Male. — Similar in every way to the female except that the 

 abdomen is somewhat shorter. 



Type-locality. — Santa Paula, California. 



Type.— Cdit. 1^0. 26178, U.S.N.M. 



Host. — Chaitophorus salicicola Essig. 



Described from a single female and two males mounted on slides 

 and reared by E. O. Essig from the above named host. 



The writer at first determined these specimens as automatus 

 Girault but after a study of all the species in the National Collection 

 is now convinced that they should be held distinct. 



