232 



SANITARY ENTO:\IOL0Gy 



prevent breeding in straw wliich falls out of tlic stalls and windows of 

 the stables. Where the stables adjoin a road, considerable straw ma}' 

 fall out of the windows and remain outside the building in a place where 

 the horses do not come, and no one may think of removing this straw 

 with the daily removal of manure. Here is an excellent place for 

 Stomoxys to breed. Wherever marine weeds and debris are washed 

 ashore and form considerable masses, Stomoxj'.s is likely to breed. In 

 plate X^'II is shown the proper method of stacking straw to prevent 

 fly breeding. 



Pi.\TE \\ II — Sti m stack shoNUiiii: iiro])ei uilHiiI ut l)Uil(lino stiiw stick (Bishopp.) 



Horn Flies 



Haematohia sanguisugens is an Indian bloodsucker, which attacks 



cattle and horses. The princi]ial species of horn flies belong to the 



genus Lyperosia,- of which L. irriians Linnaeus (plate XVIII) and L. 



cxigiia jMeijere are the two commonest bloodsuckers. The latter is 



oriental. The horn fly was treated very fully by ]\Iarlatt in a circular 



now out of print. This species is so called because of the habit of the 



adults of clustering on the base of a cow's horn. The flies also cluster 



on other parts of the animal and cause great annoyance. Even when not 



feeding the flies rest on the cattle. The eggs are laid singly on the surface 



of wet dung. The moment the dung is dropped a swarm of flies dart from 



the animal to the dung and remain there a few seconds, during which time 



"Dr. J. M. Aldrich does not recognize Lyperosia, but places our American species in 

 Haematobia. — W. D. Pierce. 



