ART. 15«. REVISIOX OF SUBFAMILY PLATYGASTERINAE FOUTS. 121 



5. LEPTACIS PALLIPES, new species. 



Female. — ^ Length 0.90 mm. Body moderately robust, entirely 

 polished except for the anterior dorsal surface of the thorax and for 

 the vertex: head lenticular, seen from above twice as wide as long, 

 slightly wider than the thorax; frons, occiput, and cheeks without 

 visible sculpture; antennae nearly bare, the pubescence obscure; 

 thorax convex above, slightly higher than wide, less than twice as long 

 as wide; mesonotum slightly excavated and hairy on each side of a 

 narrow lobe which touches the base of the scutellum; scutellum about 

 one and one-half times as long as wide, triangular, sharply pointed at 

 the narrow angle, sparsely pubescent, arched; seen from the side the 

 upper surface continues that of the mesonotum and is nearly straight; 

 the spine projects apically as far as the base of the first abdominal seg- 

 ment, is as long as the propodeum and thickens rapidly proximad; 

 the spine moreover, is a little less than one-half the the length of the 

 rest of the scutellum, its lower part transparent; abdomen as wide as 

 the head, slightly longer than the thorax, strongly convex above and 

 below, broadly ovate in outline, two-thirds as wide as long; first ter- 

 gite entirely, and second narrowly at base, sparsely pubescent; second 

 tergite as wide as long, four times as long as the following segments 

 united ; terminal tergites broadly transverse, faintly shagreened medi- 

 ally; sides of the abdomen regularly curved ; wings hyaline, with long 

 cilia apicall}^, extending nearly the length of the thorax past the apex 

 of the abdomen. Shining black; scape, pedicel and legs, except pos- 

 terior femora and tibiae apically, which are infuscated, yellow; 

 antennae dark brown; last joint of each tarsus piceous. 



Type locality. — Washington, District of Columbia. 



Type.—C&t. No. 25453, U. S. N. M. Paratypc in the authors 

 collection. 



Described from two female specimens collected by the author, June 

 21 and August 6, 1917 (type), on the leaves of a Catalpa tree. 



6. LEPTACIS AMERICANA (Ashmead). 



Plate 1, fig. 6. 



Amblyaspis amcricanus Ashmead, Can. Ent., vol. 19, 1887, p. 129. — Cresson Syii. 

 N. Am. Hym., 1887, p. 249.— Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 269. 



Female. — Length 1 mm. Very similar to longipes from which 

 it differs as follows : Mesonotum squarely excised posteriorly, without 

 a lobe projecting upon the base of the scutellum; spine of scutellum 

 not sharply pointed apically, seen from the side not much narrowed 

 toward the base; abdomen wider than the thorax, two-thirds as w4de 

 as long; second tergite as wide as long; wings projecting the length 

 of the second tergite past the apex of the abdomen. Shining black; 

 legs golden-yellow; posterior femora distally slightly, and the tibiae 

 distally, strongly infuscated; tarsi stramineous. 



