66 [January 



or two spots beneath the stigma; nervures and stigma blackish. Legs 

 black, the four anterior coxae rufous at base ; posterior coxae, femora 

 and tibiaa, except tips, rufous. Abdomen oblong-ovate, subdepressed, 

 smooth and polished, the second segment deeply incised at base; ovipo- 

 sitor about half the length of the abdomen, pale rufous, valves black. 

 Length 3| lines; expanse of wings 7 2 lines. 



Male. — Resembles the female, except that the head is slightly dusky ; 

 the wings somewhat paler; the middle tarsi white, except tips (the an- 

 terior legs wanting), the posterior tibiae entirely dusky, and the third, 

 fourth aud fifth segments of the abdomen also incised at base, although 

 not so deeply as the second segment. 



Collection. — Ent. Soc. Philad. % , Dr. J. Gundlach $ . Two specimens 

 examined. 



Genus MICROGASTER, Latr. 

 Microgaster mediatus, n. sp. 



Pale rufous; antennae, most of pleura and the metathorax, black ; wings fusco- 

 hyaline ; metathorax coarsely rugose, carinated ; abdomen depressed. 



Male. — Pale rufous, shining; antennae longer than the body, stout 

 and flattened at base, gradually attenuated to the tips, black, basal joint 

 rufous beneath. Thorax polished ; mesothorax smooth, without im- 

 pressed lines ; pleura sometimes entirely rufous and sometimes almost 

 entirely black, with a deep excavation on each side beneath; scutellum 

 rufous, convex, the space on each side finely striated ; metathorax en- 

 tirely deep opaque black, sometimes rufous at the base above, coarsely 

 rugose, with several sharply defined, longitudinal carinas ; teguloe ru- 

 fous. Wings f'usco-hyaline, varied with subhyaline, the apical third 

 uniformly fusco-hyaliue ; nervures and stigma black, the latter rather 

 large, and more or less pale at base; the inner half of the first submar- 

 ginal cell subhyaline, or paler than the outer half. Legs pale rufous, 

 sometimes orange-yellow ; tips of the posterior femora, and most of their 

 tibiae and tarsi, blackish Abdomen ovate, depressed, polished, pale 

 rufous, sometimes orange-yellow ; basal segment deeply excavated. 

 Length 'Z\ — 3 lines; expanse of wings 5 — 5| lines. 



Collection. — Ent. Soc. Philad. Two specimens. 



Readily distinguished by the black metathorax, which is very con- 

 spicuous in contrast with the rufous color. 



Microgaster flaviventris, n. sp. 



Blackish; abdomen and legs deep yellow ; thorax varied with dull rufous ; 

 wings hyaline, iridescent. 



Female. — Head black, face tinged with rufo-piceous, palpi whitish ; 

 antenna; nearly as long as the body, pale testaceous, tinged with fus- 



