APPENDIX. 



THE HORN FLY OF CATTLE. 

 {HcBtnatobia serrata R.-Desv.; Order, Diptera.) 

 This cattle pest has not yet made its way into Kansas * (at least, 

 is so far unnoticed here,) but its appearance in Illinois this sum- 

 mer, (Dr. Williston, on August 25, received specimens from Mr. 

 John Marten, Champaign, III, Assistant State Entomologist,) 

 and its steady migration westward, induces me to append here a 

 brief account of its habits, etc. The Horn Fly in America has 

 been studied independently by Prof J. B. Smith, and by Mr. L. 0. 

 Howard and Mr. C. L. Marlatt, of the division of entomology. 

 United States Department of Agriculture, under the direction 

 of Dr. C. V. Riley, chief of the division, and their observations 

 have been recorded in Insect Life, vol. ii, No. 4, (October, 1889,) 

 pp. 93-103. From this account the following brief notes are 

 chiefly taken. 



Diagnosis.— Attacking cattle ; swarms of small, black flies in 

 summer, gathered, when feeding, "over the back and flanks and 

 on the legs" of cattle, sucking the blood. When resting, the 

 flies, if abundant, cluster around the bases of the horns (whence 

 the name). To distinguish the Horn Fly from other cattle-infesting 

 flies, note the habit of clustering on the horns, and compare speci- 

 mens with the description. See "Description and Life-history" 

 to follow. 



Description and Life- history. —The fly is about one-sixth of 

 an inch long, black, with brownish and grayish tinges. Wings 



* since writing this (September), an article on "the Cow-horn Fly," by Prof. E A 

 Popenoe, of the Kansas State Agricultural College, Manhattan, appeared in the Indus- 

 trialist, October 8, in which the author states that the fly has appeared in Kansas He 

 ays: 



" So far as recorded, Manhattan is the westernmost point yet reached by this flv and 

 It has been noticed here only since the 19th of September last, when it was observed 

 by Assistant Marlatt on milch cows a mile from the college. Since that date it has been 

 found on various herds in this immediate vicinity, but is apparently vet restricted to a 

 narrow area, herds a few miles away showing no evidence of Its presence!" 



A newspaper account of the appearance of a "small black fly " in "great numbers," 

 infesting cattle about Guthrie, O. T., these flies gathering in clusters on the bases of 

 the horns, leads me to suspect the presence of this pest among the cattle of the Indian 

 Territory. 



—8 (113) 



