inse;cutor insciti^ menstruus 117 



until its status can be definitely determined. It would appear 

 to mark a good division of the old genus Sarcophaga. 



Carcinomyia Townsend, 1915, Proc. Biol. Soc. Wash., 

 XXYIII, 21 equals Cynomya R. D. (1830). This genus was 

 founded on the male forceps being nearly as long as middle 

 femora, the second hypopygial segment greatly enlarged and 

 elongated, and the very marked hairiness of tlie body ; male 

 Cynomya cadaverina R. D., in absence of male mortuorum, 

 being taken for comparison as typical of Cynomya. Dr. Aid- 

 rich advises' me (in litt. Sept. 30, 1915) : "I find that Hough 

 was in error when he stated that the terminal chitinous hooks 

 in hirta are much smaller than in mortuorum ; they are of ap- 

 proximately the same size and shape. The other characters 

 exist as stated, (1) hairiness in the male, (2) slight chjetotactic 

 characters in the female, but are purely specific in my opinion." 

 1 agree with Dr. Aldrich on this point, after examining male 

 mortuorum sent me by him. Moreover, mortuorum shares 

 with hirta the hairy character of the male, which is merely 

 less developed in the former than in the latter. 



The differences between hirta and cadaverina exist, neverthe- 

 less, as I saw them, and mark two valid groups. It only re- 

 mains to name the cadaverina group, which is truly intermediate 

 between Cynomya and Musca. I agree with Hough that Cyno- 

 mya and its close relatives belong with Musca (Calliphora). 

 Male reproductive-system characters prove this, the vasa de- 

 ferentia being short and moderately slender in Musca (TD- 

 4338) and the cadaverina group (TD41:97), but long and 

 microscopically slender on basal half or more in Sarcophaga 

 and relatives (TD4190, 4482, 4503, 4527). The characters 

 of the four genera of the Cynomya-Musca group are given 

 below. 



Musca L. — Hind tegulse hairy in both sexes. Front femora 

 not swollen in either sex. Male with legs and body not long- 

 hairy ; second hypopygial segment extremely short, not longer 

 than first or but little longer, hypopygium small ; forceps 

 elongate, but not enlarged. Abdomen broadly rounded anally 

 in both sexes. 



