174 Journal New York Entomological Society. [Voi. xxiv, 



Genitalia. — Penis and claspers peculiarly modified, head of penis promi- 

 nently spiny anteriorly as seen in profile. Accessory plates short but as seg- 

 ments are pulled out they show from behind as two erect plates parallel to 

 but much shorter than forceps. 



Female. — They differ from the males in the following important characters. 



Head. — Breadth of front at its narrowest part practically equal to eye 

 width, inner eye orbits diverging downward. Vestiture of genae may be longer 

 and more scattered. 



Thorax. — Hairs covering anterior spiracle more distinctly grayish, en- 

 tirely so or dark only basally. 



Legs. — Lower row of bristles on anterior face of third femur more nearly 

 complete than in male ; ventral row of posterior face consisting of long, well 

 separated bristles (usually four or five) on proximal half or slightly more. 

 Anterior and posterior rows of bristles of middle femur complete, very weak 

 on distal half, " comb " absent. 



Chastotaxy. — Bristles of lower sternopleura arranged in three distinct 

 rows. 



Abdomen. — Depth much less than width, outline oval. Vestiture of short, 

 reclinate bristles except that bristles become longer and more erect laterally 

 on second and third nota and laterally and ventrally on fourth notum. Ven- 

 tral plates concealed in part ; first and second plates, sometimes also third and 

 fourth, with one or more pairs of surface bristles besides those of posterior 

 margin. 



Genital Segments. — Dull orange, grayish or yellowish pollinose. Sixth 

 notum not divided into lateral lips, narrow, visible only from behind, margin 

 fringed with bristles; spiracles below center, often concealed by edge of 

 fourth notum ; seventh notum much smaller than sixth, but similar and visible 

 just beneath it. 



Described from seven male and nine female specimens; several 

 others examined. 



Range : New England — Mass., Provincetown, Truro, Horseneck 

 Beach, Nantucket, Cambridge, Saxonville, Lunenburg. 



United States: N. Y., N. J., Pa., O. 



Foreign: Canada (Manitoba?), Cuba (?), Hayti (?). 



This species is peculiarly distinct from all others described. The 

 -character of the genital segments is distinctive in both sexes. The 

 parafrontals and gen?e are silvery gray, and particularly striking in 

 the male because of the unusually wide front for that sex. There 

 has been considerable doubt in my mind into which niche in the fam- 

 ily this species could be sidetracked. Both its genital and external 

 characters differ decidedly from those found in the genus Sarco- 

 phaga. Some time ago I submitted a specimen to Dr. Bottcher for 



