1916] North American Drosophilidce 343 



Dorsum of thorax strongly convex; a single pair of dorso-central 

 bristles and no prescutellars. Acrostichal hairs in six rows. Dorsum 

 of thorax, scutellum, and pleurae above wings shining blue black. 

 Pleurse below wings, and legs, pale yellow. Apical bristles on second 

 tibiae, preapicals on third. 



Abdomen shining black. First segment with one median and two 

 small lateral yellow spots; second segment with a median one, third 

 with an anterior yellow band. 



Wings black just beyond the base, a black oblique band from the 

 apex of the costal cell to the apex of the anal cell, tip of second vem 

 darkened. The apical portion of the costal cell is drawn out into a 

 rounded process, extending beyond the rest of the anterior margin of 

 the wing. Costal index about 1.1; 4th vein index about 2.2; 5x mdex 

 about 2.0; 4c index about 1.9. 



Length body l^mm., wings IJE^mm. 



Type, San Francisco Mts., St. Domingo, 4. 9. 05, (A Busck) 

 U. S. N. M. collection. A headless specimen from Mont- 

 serrat, Trinidad, W. I. (A. Busck) agrees. 



This species belongs to the same group as D. dimidiata Lw. 

 and D. thoracis Willist. The projecting costal cell, low costal 

 index and spotted wings will serve to distinguish it from those 

 species. 



