20 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. Gl. 



fovea medially on the posterior half of segment; second abdominal 

 tergite transverse, short, broader at apex than at base, more than 

 four times as broad at apex as long down the middle, and largely 

 smooth and shining; remainder of dorsum of abdomen smooth and 

 polished; hypopygium large, slightly projecting; ovipositor sheaths 

 nearly as long as the abdomen. Black ; antennae, tegulae, all coxae, 

 most of the middle femora, and hind femora entirely, black; apex 

 of posterior tibiae, and the posterior tarsi, except at base of basal 

 segment, blackish; wings whitish-hyaline; veins hyaline; stigma 

 brown only in the margins ; abdomen black. 



^l/^?e.— Essentially as in the female, differing, however, in the 

 longer antennae, and the less distinct median fovea on first abdominal 

 tergite. 



Type.—C2.t. No. 24961, U.S.N.M. 



Tyj)e Z(9<?«.Z%.— Uvalde, Texas. 



Hosts. — Melitara junctolmeella Hulst, and Mimorista flavidis- 

 sinialis Grote. 



Described from four females and one male reared by J. C. Hamlin, 

 June, 1921. 



Genus MICROGASTER Latreille. 



Microgaster Latreille, Hist. Nat. Crust. Ins., vol. 13, 1805, p. 189. Oeno- 



type. — Ichneumon deprimator Fabricius (Latreille, 1810). 

 JlVitroplitis Thomson, Opusc. Eutom., pt. 20, 1895, pp. 2238, 2244. Geno- 



tijp(,_ — Microgaster russata Haliday (Viereok, 1914). 

 Ilppomicrogastcr Ashmead, Proc. Ent. See. Wash., vol. 4, 1898 (1897), 

 p. 16a; Smith's Insects N. J., 1900, p. 594. Genotype.— Microgaster 

 zonaria Say (Monobasic). 

 Protomicroplitis Ashmead, Proc. Ent. Soc. Wash., vol. 4, 1898 (1897), 

 p. 167. Genotype. — Protomicroplitis garmani Ashmead (Ashmead, 1900). 

 Diolcogaster Ashmead, Smith's Ins. New Jersey (Mar.) 1900, p. 594; 

 Proc. U. S. Nat. Mus., vol. 23, Oct., 1900, p. 132. G.enotype.— Microgaster 

 hrevicatida Provancher (Monobasic). 

 Head transverse ; clypeus separated from face by a raised line ; eyes 

 hairy; antennae 18-segmented ; mesoscutum without parapsidal fur- 

 rows; mesopleurae very rarely with a crenulate hirrow ; stigma never 

 longer than metacarpus ; second intercubitus present, the second cubi- 

 tal cell complete ; posterior coxae large, half as long as the thorax ; 

 spurs of middle tibiae as long as the middle metatarsus; spurs of 

 posterior tibiae more, usually much more, than half as long as the 

 posterior metatarsus; abdomen sessile. 



This genus and the following are very closely allied, and while 

 most species are readily placed a few are so close as to be separable 

 only with great difficuity. HoAvever, the combination of characters 

 given in the key to genera should suffice to distinguish between species 

 of Microgaster and Microplitis. 



