ART. 15». REVISION OF SUBFAMILY PLATYGASTERINAE FOUTS, 85 



Type locality. — Champaign, Illinois. 



Type. — The location of type unknown to author. 



Habitat. — North America. 



Described from reared specimens from Indiana, Illinois, North 

 Dakota, Nebraska, and Oregon. The species probably occurs wher- 

 ever the Hessian Fly infests wheat for it is one of the most important 

 parasites of that destructive insect. Heimalis and vernalis are 

 among the most frequently reared parasites of Phytophaga destructor 

 Say. Specimens of Platygaster vernalis emerge from the puparia of 

 the Hessian Fly in tlie spring and specimens of heimalis in the fall. 



Variations with the exception of size are not common in this 

 species. Some specimens may be twice the size of others but the 

 proportions remain fairly constant. I have examined several thou- 

 sand specimens in the entomological laborator}^ at Carlisle, Pennsyl- 

 vania, and find that with the uniformity in sculpture and color comes 

 uniformity in the number of specimens in the sexes. The males are 

 not more numerous than the females as is the case with Platygaster 

 vernalis Myers. 



xVshmead in his Monograph says that we have types of this species 

 in the National Museum. I can find none and believe he was mis- 

 taken. None of the specimens in the systematic collection bear the 

 date 1888, the year in which Forbes reared the types. 



49. PLATYGASTER MARYLANDICA. new species. 



Female. — Length 1.10 mm. Head twice as wide as long, elliptical 

 seen from above, scarcely emarginate posteriorly, flattened in front, 

 wider than the thorax; occiput rather strongly striate; cheeks flat- 

 tened, shagreened; frons mostly polished, finely aciculate and sha- 

 greened above on the sides, aciculate below ; pedicel twice as long as 

 wide, nearly as long as joints three and four united, about as wide as 

 four; three longer than wide, narrower than two, two-thirds the length 

 of four; four as long and as wide as live, one and one-half times as 

 long as wide; six wider than five, as long as wide at apex; seven and 

 eight a little longer than wide; nine as wide as long; ten longer than 

 the pedicel, blunt at apex, the sides parallel nearly to the tip; thorax 

 higher than wide, strongly convex above; pronotum aciculate later- 

 ally; mesonotura shming, finely shagreened (except on median lobe 

 posteriorly, and on the lateral lobes) ; notauli briefly indicated before 

 the scutellum, the median lobe truncated posteriorly; scutellum trans- 

 verse, very high and convex, polished, sparsely pubescent laterally; 

 abdomen elliptical, the sides regularly curved, as wide as the thorax, 

 twice as long as wide, as long as the head and thorax united, pointed 

 apically; first tergite regularl}^ arched above, with numerous longi- 

 tudinal oarinae, without a flattened area sublaterally; second tergite 

 slightly longer than wide, the sides curved; basal foveae not very dis- 



