120 THE CANADIAN ENTOMOLOGIST ' 



vertex of the head which is dark excepting the clypeal region. Antennae brown. 

 Legs yellow. 



In the male the second tergite extends much below the level of the collum 

 and is angularly produced below at anterior corner. In the male the second 

 tergite is on the same level below as the collum. The collum is more elongate 

 than in the female, as usual, and the longitudinal stria above the lateral border 

 is strongly marked. On each side of the second tergite below are typically three 

 longitudinal stria; in the male. 



The cardo of mandibles of the male is large. It is concavely excavated 

 below, leaving a larger angular anterior process and a smaller posterior one. 



Segmental suture in a well-impressed encircling groove, widely curved 

 opposite the pore from which it is well removed. 



Cauda of anal tergite straight, caudally rounded, decidedly exceeding the 

 valves in both sexes. 



First legs in male strongly crassate and uncate as usual. 



The species is most readily to be distinguished by the structure of the 

 gonopods of the male, particularly by the form of the second pair. These 

 are distally branched, presenting two acute spurs, visible in anterior view, pro- 

 jecting from beneath the plate of the first pair, one of them being apical, and a 

 larger mesal principal branch which curves mesad against the corresponding 

 branch of the other gonopod as shown in the accompanying figure. 



Number of segments mostly forty-six or forty-seven. 



Length near 27 mm. 



OVIPOSITION OF RHINOGASTROPHILUS NASALIS L. 

 Referring to Mr. A. E. Cameron's article in Science for January 3, 1919, 

 p. 26, I would insist that my observations, as recorded in Can. Ent. for July, 

 1918, are absolutely correct. In repeated instances I saw the fly strike at the 

 muzzle of the horse just as I have described. While the egg of nasalis is easily 

 to be distinguished from that of intestinalis , I still maintain that both are "prac- 

 tically the same size and shape" as compared with that of haemorrJioidalis. I 

 also still believe that my tentative conclusions as to the method of oviposition 

 are extremely probable. As to the observations recorded, they are not inaccurate 

 in any sense. 



C. H. T. TOWNSEND. 



Mailed May 20th, 1919. 



