June, 1915.] Aldrich : The Deer Bot-Flies. 145 



E. rupium Fabricius, a well-known European species, here recorded 

 from northern British Columbia for the first time as a North 

 American species. 



E. tenax (Linne), now distributed over nearly the whole world, 

 though formerly limited to the eastern hemisphere. The records 

 for this species in North America go back only to 1870. 



Eristalis latifrons Loew. 



This species has been considered as limited in its distribution to 

 the western part in North America, where it has been listed from 

 nearly all the western states east to Kansas, north into British Co- 

 lumbia and south into Mexico. During the summer of 1901 I took a 

 number of specimens at Fargo, N. D., and supposed that this was 

 about the eastern limit for the species. Later, on examining the col- 

 lections in the American ^Museum of Natural History, I found speci- 

 mens taken by Prof. W. M. Wheeler in Wisconsin. Within recent 

 years, however, several specimens have been taken in the vicinity 

 of New York City. The first of these, as far as my observations 

 go, was taken near Brooklyn, N. Y., on July 15, 1908, by Mr. Geo. P. 

 Engelhardt. Another was taken at Snake Hill, N. J., on July 16, 

 191 1, by Mr. John A. Grossbeck, and I have seen others. These 

 eastern specimens are indistinguishable from western ones. 



THE DEER BOT-FLIES (GENUS CEPHENOMYIA 



LATR.) 



By J. M. Aldrich, 



La Fayette, Ind. 



■ The discovery of adults of a North American species of Cephe- 

 nomyia seems to justify some discussion of the history, taxonomy 

 and biology of the genus. 



There are four European species, all quite fully treated by Brauer 

 in his classic "Monographic der Oestriden" of 1863. All live in the 

 larval stages in the nasal passages, on the soft palate, at the base of 

 the tongue, in the Eustachian tubes and pharynx of various members 



