54 



Cincinnati Society of Natural History. 



ish-metallic tinge in certain lights; metathorax, including the 

 post-scutellum, aeneous ; legs, except coxae, white; abdomen 

 3eneotis-black ; antennae 8-jointed, black, the scape with a 

 light yellowish stripe beneath ; flagellum pilose, the joints 

 compressed or flattened: the funicle 3-jointed. loosely joined, 

 the first the longest, almost as long as the 3-jointed club, the 

 other two joints subequal, the second being about three times 

 as long as wide, the third only two and a half times as long as 

 wide; club 3-jointed, the joints compacted, the sutures 

 scarcely distinguishable. Thorax with the mesothoracic fur- 

 rows not defined posteriori}', the surface w r here they should be 

 being only slightly depressed ; metathorax short with a 

 delicate median carina, the spiracles round; wings hyaline, 

 iridescent, the nervures pale; the marginal vein is very long, 

 nearly twice the length of the subcostal vein ; the stigmal 

 short, oblique, while the post-marginal is w T ell developed. 



Abdomen ovate, petiolated, the petiole short but distinct, 

 punctate, constricted at base ; second segment the longest, 

 occupying about one-third of the surface of abdomen proper, 

 the following segments all very short. 



Hab. — Columbus, Ohio. 



Bred by Prof. F. M. Webster from a Cynipidous Gall, Aulax 

 sp. on Lactuea. 



Sub-family Tetrastichin^e. 



Tetrastichoides Ashmead. 



(13) Tetrastichoides lasiopter^e, sp. n. Female — 

 Length 1.8 mm., black, subopaque ; antennae, brown ; scape, 

 tegulae, trochanters, apical third of all femora, and all tibiae and 

 tarsi, light brownish-yellow; mandibles piceous. Head trans- 

 verse, antero-posteriorly very thin, the frons concave, the cheeks 

 flat ; antennae 10-jointed with two ring-joints, clavate, extend- 

 ing to tegulae, the first funiclar joint slender, cylindrical, the 

 two following broadened, subequal. Mesonotum without a 

 longitudinal impressed median line ; scutellum with four im- 

 pressed lines ; metathorax short, with a delicate median keel, 

 forked at apex ; wings hyaline, the venation pale yellowish. 



