No. 6.] CALLIPHORINAE OF THE UXITED STATES. 285 



Cynomyia. — Our common species is probably C. cadavcrina 

 Desv. (Fig. 4). I described it as C. americana in Ent. Nezi's, 

 May, 1898, and am indebted to Mr. Coquillett for pointing out 

 the synonymy. C. elongata Hough {loc. cit.) may be distinguished 

 by its more elongate form and the uniform presence of an ante- 

 rior intra-alar bristle. C. hirta Hough, Alaska {Ent. Neivs, 

 September, 1898), has a golden yellow face and a long, dense 

 coating of hair on thorax, abdomen, and legs. 



All o\xr Cyjiomyiae have a blackish blue, opaque, faintly striped 

 thorax, a metallic green, blue, or violet abdomen, and black legs. 



Calliphora. — All our species have reddish palpi, bluish black, 



opaque thorax, metallic blue or green, more or less whitish pol- 

 linose abdomen, and black legs. Chaetotaxy alike in all, except 

 that a third posterior intra-alar bristle is regularly present in 

 some species and regularly absent in others. 



Bucca black, beard red ; 3d post. i.a. rarely present . vomitoria L. 



Bucca brownish or reddish, beard black ; 3d post. i.a. rarely present 



erythrocephala Meig. 



Bucca black, but with suggestions of red on its cephalic half, beard black ; 

 3d post. i.a. present; front of male one-fifth to one-sixth as wide as 

 the head (in the preceding species not more than one-tenth) 



colorade)tsis nov. sp. 



Bucca black, beard black ; 3d post. i.a. present : front of male not over one- 

 tenth as wide as head, frequently linear . 7'iridescens Desv. 



Bucca black, beard black ; 3d post. i.a. absent or minute : front of male at 

 vertex (which is the narrowest part) one-fourth as wide as head ; a 

 second large pair of ocellar bristles present . latifrons nov. sp. 



