June, 1915.] Aldrich : The Deer Bot-Flies. 149 



violent sneezing. I satisfied myself of this by capturing a female 

 fly, when by pressing the abdomen I could secure a drop of fluid 

 with from 9 to 12 larvae. The ejection occurred with force; whether 

 this would be the case in life I will not say, but it is possible, as the 

 female only approaches the host and does not alight. . . . 



" Cephenomyia tronipe deposits young like rufibarbis; I found 

 young larvae sticking to the hairs of the abdomen of a female in my 

 collection." 



Generic Characters of Ccphenoinyia.—Kohust species with rather 

 dense and long pile. Wing with apical crossvein, the cell open ; pos- 

 terior crossvein joining the fourth vein some distance before the be- 

 ginning of the apical crossvein; fourth vein distinctly continued 

 beyond the latter (see figure). Eyes rather widely separated in the 

 male, more so in female ; antennae small, third joint very short, arista 

 bare, thick at base, dorsally attached to third joint; ptilinal suture 

 widely diverging to near the eyes below, antennal cavity small but 

 deep, continued below as a narrow groove to the oral opening; 

 mouthparts entirely concealed by the long pile, apparently not de- 

 veloped, but by removal of the hair a small proboscis and a pair of 

 palpi are found. 



The nearest ally, at least in North America, is Hypodcrma, in 

 which the posterior crossvein is almost continuous with the apical, 

 there is no continuation of the fourth vein beyond the latter, there 

 are two separate antennal cavities, etc. Ciiterebra is much less 

 pilose, the head especially being almost bare, the arista is plumose, 

 fourth vein with a rounded bend, etc. 



Cephenomyia abdominalis new species. (Plate XI.) 



Male.— A robust black species, thorax with yellow pile except a tuft of 

 black over each wing ; that on head yellow except on parafrontals, running 

 somewhat down on parafacials ; pile of abdomen black except on basal half 

 or more of first segment (and in one of three a few pale hairs on fourth 

 among the black) ; basal half of femora with long yellow pile behind. 



The only known species with solid black pile on abdomen, beyond the first 

 segment ; differs fronj all the European species in not having conspicuous red, 

 yellow or white pile on the abdomen, and in having no black pile on the 

 thoracic dorsum except a tuft over the base of each wing. 



Head black ; front not very prominent, at vertex about one-fourth the 

 entire width of head ; middle stripe with yellow pile ; the eyes diverge from 

 each other rapidly below ; in profile the bucca is about one-fourth as high as 



