THE CANADIAN ENtOMOLOGlST. 287 



Walter Faxonf added an interesting contribution to our knowledge on 

 this subject, when he described some pits and pimples found in the skin 

 of cattle and caused by the presence of the parasite in question. Faxon's 

 paper seems to have remained unknown to most authors, while a few who 

 have evidently seen it ignore it, with the remark that the description and 

 figures are so poor that no confidence can be placed in it. Only a few 

 authors have accepted his results. 



While forced to admit that from a zoological standpoint Faxon's paper 

 is not all that could be desired, I believe it should have received more 

 attention than has been given to it, and I am now in position to support 

 Faxon in his statements. 



This past winter and spring Pfister and Vogel have sent to the Hon. 

 Secretary Rusk several hides which were covered with " pimples " or 

 pustules, and which, according to their letters, have been noticed occa- 

 sionally in former years, but never in such alarming frequency as this 

 year. 



The hides were referred to me for examination, with the following 

 result : — 



They were dotted with numerous swellings about as large as a pea, 

 and with numerous small punctures about the diameter of a pin. 



Upon opening the swellings it was found that they contained a granular 

 mass, which, owing to the preparation through which the hides had passed, 

 was greatly changed histologically ; besides the granular substance there 

 were immense numbers of D. folliculorum var. bovis. The parasites 

 were easily recognizable, but were too macerated to warrant my giving 

 figures of them in this note. The punctures were evidently the entrances 

 to hair-follicles, while the lumen of the pimples evidently represented 

 enlarged hair-follicles, the enlargement being due to the immense numbers 

 of the parasitic mites present. 



Dr. Michener requested Messrs. Pfister and Vogel to informs us in 



regard to the frequency of these pimples in hides which came through 



their hands, and received the following reply : — 



" Milwaukee, Wis., April 28, 1892. 

 "Dr. C. B. Michener, Asst. Chief, Bureau of Animal Industry, Washington, D. C, : 



" Dear Sir, — Yours of the 22nd inst. received, and we are very thankful for the 

 information you have furnished us. We have had such a variety of opinions on just what 



+0n the Presence of Dentodex follicitloruut in the skin of the Ox : Bulletin of the 

 Museum of Comp. Zool. of Harvard College, Cambridge, Mass., 1878. Vol. 5, No. 2, 

 p. 11-16. I ri. with 9 figs, 



