174 Psyche [December 



both resemble the otherwise quite distinct A. dimidiahim apicale. 

 In ydkima, however, the apical third of the anterior wings is black. 



True A. ccquabile, of which I examined a very long series, is 

 readily separated by the apical black of the wings, which is con- 

 spicuously less intense, having its inner side less well defined, and 

 projecting toward the base of the wing in the middle, the shape of 

 the inner margin being roughly that of a broad V. The hudsoni- 

 cam form, which seems weakly characterised, goes with cpquabile. 



Possibly A. ydkima should be considered a valid species, and 

 coloradicuin a subspecies of it. 



The type of coloradicuin has been placed in the National 

 Museum. 



DIDACTYLOMYIA CAPITATA SP. NOV. 



By E. P. Felt, 



Albany, N. Y. 



The peculiar male described below was collected by Mr. Owen 

 Bryant in August, 1907, either at North Adams, Mass., or on 

 Greylock Mountain. It is closely allied to D. longimana from 

 which it is most easily separated by its slightly smaller size, the 

 capitate terminal clasp segment and the relatively longer harpes. 



Didactylomyia capitata sp. nov. 



Male. Length 1.25 mm. Antennae probably a little longer than the body, 

 sparsely haired, the stems white, the basal enlargement dark brown; probably 

 fourteen or sixteen segments, the fifth with a stem one-fourth longer than the 

 cylindric basal enlargement, which latter has a length two and one-half times its 

 diameter. Palpi; the first segment irregular, with a length about twice its diameter, 

 the second lanceolate, with a length nearly four times its diameter, the third a 

 little shorter and more slender than the second, the fourth about as long as the 

 third, somewhat dilated. Mesonotum, scutellum and postscutellum mostly red- 

 dish brown, the scutellum slightly yellowish apically. Abdomen yellowish, reddish 

 basally. Halteres and legs pale yellowish white. Genitalia; basal and terminal 

 clasp segments both greatly produced, the latter decidedly capitate apically; dor- 

 sal plate short, broad, deeply and narrowly incised, the sparse setose lobes nar- 

 rowly rounded; ventral plate short, broad, broadly and roundly emarginate. 

 Harpes, basal portion broad, obliquely truncate, the inner angles produced as a 

 somewhat irregular, capitate process as long as the basal portion and extending to 

 the tip of the style, which latter is stout, tapering and narrowly rounded. Type 

 Cecid. 1439. 



