1914] Brues—The Phorid Genus Platyphora of America 79 
Described from a single male collected at Forest Hills, Mass., 
May 30, 1910, by Mrs. C. T. Brues. The insect was moving about 
among fallen leaves in an open wooded area. Ants of various 
kinds are abundant in the vicinity and it is possible that the species 
may be myrmecophilous like its European congener, P. lubbocki. 
Platyphora coloradensis sp. nov. 
oo. Length1.8mm. Black; antenne dark fulvous, darkened on the tip of the 
third joint; palpi pale yellow; legs testaceous, tinged with fuscous on the tibize and 
fuscous on the tarsi. Pleurze pale fuscous, piceous on the posterior half of the meso- 
pleura. Hypopygium retracted, but apparently brownish as in P. eurynota. Head 
structurally as in P. eurynota, and also the mesonotum, except that the dorsocentral 
bristles are larger. Scutellum dull, not at all shining, with shagreened surface; 
the series of bristles along its margin larger than in P. eurynota. Abdomen with 
the second and sixth segments lengthened, slightly pruinose and nearly bare on the 
first to fifth segments; sixth shining and clothed with sparse hairs. Pleurze and legs 
asin P. eurynota. Wings hyaline; heavy veins pale brown, except the apex of 
the costal vein which is fuscous; light veins very pale; costal bristles larger than in 
P. eurynota; third vein bristly to the fork and second vein bristly; third vein thick- 
ened, but not much stouter than the costa, light veins much as in P. eurynota, but 
the fourth and fifth are less divergent at tip and the seventh apparently farther from 
the margin. Halteres black, except at extreme base. 
Described from a single specimen collected on a window at 
Boulder, Col., by Mrs. T. D. A. Cockerell, July 17, 1908, and sent 
to me by Prof. Cockerell. 
This species is very similar to P. eurynota in structure, although 
entirely different in color and much smaller. It might perhaps be 
considered as a mere color variety, but the scutellum is dull and the 
Wing venation is not identical, so it appears to be a perfectly dis- 
tinct, but allied species. 
DESCRIPTIONS OF TWO NEW GENERA OF PARASITIC 
HYMENOPTERA.* 
By S. A. Rouwer. 
The following new genera and species are parasites of two insects 
which have been proven to be of economic importance in relation 
to the chestnut. The descriptions are offered at the present time 
* A contribution from Branch of Forest Insects, Bureau of Entomology, Washington, D.C. 
