4 University of Michigan 



Cm close to the fork of M, in most cases at or immediately 

 beyond this fork. 



Abdominal tergites dark brown; sternites yellow or brown- 

 ish yellow, the subterminal segments especially darkened. 

 Male hypopygium with the pleurites moderately stout, the 

 outer caudal angle produced caudad into a short, cylindrical 

 lobe ; two pleural appendages, the ventral appendage elongate, 

 fleshy, with the long apex obliquely truncated, the proximal 

 face not setigerous ; dorsal pleural appendage a triangular 

 fleshy lobe, the cephalic portion produced proximad into seti- 

 gerous beak, the caudal angle produced into a conspicuous 

 blackened blade that is directed dorsad, the apex shallowly two- 

 toothed. Penis-guard straight, comparatively slender, the apex 

 truncated ; before the apex on the ventral face with a conspic- 

 uous subapical spine. Gonapophyses straight, slender, broad 

 at the base, the extreme tip of each produced into a small, 

 pale spine. 



Holotype, male, Clifty Ravine, near Hanover, Jefferson 

 County, Indiana, June 15, 192 1 (Alexander). 



Allotopotype, female, 



Paratopotypes, 40 males and females (Alexander and 

 Rogers). 



Gonomyia (Gonomyia) armigera, sp.n. 



Male. — Length, about 4.8 mm.; wing, 5.5 mm. 



Closely related to G. Horens Alexander, differing as follows : 



Longitudinal pleural pale stripe slightly wider and less 

 tinged with yellow. 



Male hypopygium with the dorsal pleural appendage not 

 conspicuously dilated basally, gradually narrowed into the 

 comparatively short but stout stem, this provided with from 



