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. lubboci. Platyphora coloradensis sp. nov. o . Length 1.8 mm. Black; antennm dark fulvous, darkened on the tip of the third oint; palpi pale yellow; legs testaceous, tinged with fuscous on

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... e tibiae and fuscous on the tarsi. Pleurae pale fuscous, piceous on the posterior half of the mesopleura. 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. Pleurae and legs as in 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 thickened, 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. Hindawi Publishing Corporation