OF WASHINGTON, 159 



Type. — No. 10067, U. S. National Museum. 

 Differs from E. mirabile Ashm. in the white tarsi and in hav- 

 ing the abdomen purplish. 



Family PTEROMALID^. 

 Subfamily Pteromalin.^. 



Tribe Pteromalini. 

 Zatropis, n. gen. 



Type. — Z. catalpcB Crawford. 



Mandibles strongly four-toothed; head very thin antero-posteriorly, 

 the lateral ocelli touching the vertex and at the upper angle the eyes 

 almost touching; antennae with three ring joints, the pedicel slightly 

 longer than the first joint of the funicle, the first joint being the longest 

 of the funicular joints; punctures of head and thorax small, thimble- 

 like; postmarginal vein longer than stigmal ; stigmal uncus long; 

 neck of metathorax short; metathoracic spiracles large, long-oval; 

 median carina of metathorax strong, on each side of it a depressed, 

 V-shaped, punctured area bounded laterally by the lateral folds which 

 posteriorly form carinee running to the neck of the metathorax, the 

 neck being a raised area; segments 1-5 of abdomen almost equal in 

 length, 2, 3, and 4 slightly emarginate medially at apex. 



In Doctor Ashmead's table of the Pteromalini this runs to 

 No. 10, but does not agree with either alternate ; going one way 

 runs to number 17, a genus never described by Doctor Ash- 

 mead, and the other way it runs to 18, where none of the 

 genera has three ring joints in the antennae. 



Zatropis catalpae, n. sp. 



?. — Length, 2-3.5 mm. Head and thorax above aeneous, pleurae and 

 beneath bluish ; metathorax and abdomen greenish or bluish ; head 

 slightly broader than thorax ; antennae brown, scape light ; head and 

 thorax with scattered, appressed, scale-like white hairs ; head and thorax 

 covered with small thimble-like punctures, those of the scutellum the 

 finest; wings clear; legs dark, the knees, anterior tibiae almost entirely, 

 middle and hind tibiae apically, and tarsi light. 



c^. — Unknown. 

 Type. — No. 10062, U. S. National Museum. 



Wooster, Ohio (H. A. Gossard), bred from the buds of 

 Catalpa bearing a species of Cecidomyia. 



Genus CATOLACCUS Thomson. 



This genus was founded for forms having two ring joints 

 in the antennae, but the American species which have been 

 referred to the genus do not all come under this head. The 



