PROC. ENT. SOC. WASH., VOL. 22, NO. 4, APRIL, IQ2O 69 



The genus Platygaster as limited by the writer may be separated 

 from the other genera of Platygasteridae by the following de- 

 scription : 



Head broadly transverse to subquadrate ; face with a truncate or emargin- 

 ate projection between the antennae; lateral ocelli remote from the eye mar- 

 gin; mandibles bidentate, the teeth approximately equal; antennae in female 

 clavate, gradually increasing in thickness toward tip, the third joint shorter 

 and narrower than the fourth ; antennae in the male filiform ; fourth antennal 

 joint as long as or longer than the pedicel, not connate with the third which 

 is shorter and usually narrower than the fourth; thorax short to moderately 

 elongate, the notauli either absent, incomplete, or complete; scutellum con- 

 vex, more or less transverse or semicircular, unarmed, and either margined 

 or immargined laterally; propodeum short, with two parallel, median, longi- 

 tudinally elevated carinae; wings pubescent, cilia te at the margins; abdomen 

 in female as short as the thorax to several times as long as the head and 

 thorax together, but always depressed, never compressed; abdomen in male 

 about as long as the thorax; second tergite in both sexes with two more or 

 less distinct basal foveae. 



Platygaster leguminicolae, new species. 



This species runs to mrginiensis in Ashmead's table to the 

 species of Polygnotus (Monogr. Proctotrypidae, Bull. 45, U. S. 

 N. M., 1893, p. 301), but differs from that species in the sculpture 

 of the fourth tergite in the female and the color of the legs in the 

 male. P. leguminicolae has the fourth tergite in the female 

 strongly longitudinally striate, and the middle and posterior legs 

 in the male black; while P. mrginiensis has the fourth tergite tra- 

 versed by a row of punctures and the male with lighter colored 

 legs. 



Female. Length 1.5 mm. Head as wide as the thorax, broadly trans- 

 verse; vertex transversely striate, not produced over the eyes; cheeks very 

 finely striate; face shining, striate all over, but more coarsely so below, the 

 striae converging to an indistinct longitudinal impression in the middle of 

 the face; scape about as long as next four articles, curved and aciculate; 

 club fusiformly developed, composed of five articles not well differentiated; 

 pedicel of the same length as and a little wider than the next two articles; 

 third joint small, two-thirds as long as and a little narrower than joint four 

 which is subequal in length and width to joint five; sixth joint subconical, 

 longer and larger than the fifth; joints seven, eight, and nine oblong, sub- 

 equal, the last slightly longer and narrower, obconical; thorax ovoid, polished; 

 notauli distinct on basal half of mesonotum; middle lobe of mesonotum ad- 

 vanced close to the scutellum; propodeum bare, carina widely divided; legs 

 black to brownish black; apices of anterior tibiae yellow; all the tarsi lighter 

 colored than the other parts of the legs; abdomen broad and long, about as 



