26 INSECUTOR INSCITI^ MENSTRUUS 



species. From the fact that the quite detailed generic and 

 specific descriptions given by Austen fit the male of lepusculi 

 exactly in every particular except the character of the arista, I 

 was unable to repress the conviction that Austen's specimens 

 had the arista denuded of hairs, especially since the very strik- 

 ing pile coloration described is known to me in no other form, 

 I accordingly wrote to the British Museum for information, 

 and now take the liberty of quoting here the reply kindly sent 

 me by Dr. Guy A. K. Marshall : "I have examined Mr. Aus- 

 ten's type of Bogeria prince ps, but, unfortunately, the head is in 

 a dirty condition, and only one antenna is left. At first sight, 

 the arista certainly does appear to be entirely bare, but, on 

 examining it with a higher power, I find a portion of a hair on 

 the basal half, and it seems to me extremely probable that the 

 arista has really been denuded. In Mr. Austen's second speci- 

 men both the antennae are gone, so that this does not throw any 

 light on the matter." In the female the white pile of pleurae 

 does not follow around the edge of scutellum and is lacking on 

 base of abdomen. Some males also lack this pile on base of 

 abdomen, while others show it conspicuously developed. The 

 species reaches Arizona, California, Nevada, and New Mexico, 

 and attacks both the jack rabbit and the cottontail. The genus 

 is valid on facial characters, as described and figured by Aus- 

 ten. 



Bogeria emasculator Fitch. — This is a valid species and en- 

 tirely distinct from fontinella Clk. It is a parasite of squirrels 

 and chipmunks. C. scutellaris Br. is the same species. It ap- 

 pears to be restricted in range to the northeastern parts of 

 North America. 



Bogeria fasciata Swenk. — This species seems to replace 

 emasculator in the west, and has the same habits. It was reared 

 by me from a larva taken in July, 1898, from the fore leg of a 

 Tamias sp., on the Rio Ruidoso, New Mexico, the fly issuing 

 the following May. The first-stage larvae of both this and the 

 preceding species probably enter such part of the host as hap- 

 pens to be most convenient, penetrating the scrotum when of- 

 fered and not by invariable habit. The headless specimen in 

 the U. S. National Museum labeled "Fitch's type" and "C. 



