ENTOMOLOGY

SANITARY ENTOMOLOGYprevent breeding in straw which falls out of the stalls and windows ofthe stables. Where the stables adjoin a road, considerable straw mayfall out of the windows and remain outside the building in a place wherethe horses do not come, and no one may think of removing this strawwith the daily removal of manure. Here is an excellent place forStomoxys to breed. Wherever marine weeds and debris are washedashore and form considerable masses, Stomoxys is likely to breed. Inplate XVII is shown the proper method of stacking straw to preventfly breeding.PJ.ATE XVII.-Straw stack showing proper method of building straws tack.(Bishopp.)Horn PliesHaemotobia sa'flguisugens is an Indian bloodsucker, which attackscattle and horses. The principal species of horn flies belong to thegenus Lyperosia,2 of which L. irritans Linnaeus (plate XVIII) and L.exigua l\feijere arc the two commonest bloodsuckers. The latter isoriental. The horn fly was treated very fully by 1\1arlatt in a circularnow out of print. This species is so c/lllcd because of the habit of theadults of clustering on the base of .1'1 cow's horn. The flies also clusteron other parts of the animal and causc great annoyance. Even when notfeeding the flies rest on the cattle. The eggs are laid singly on the surfaceof wet dung. The moment the dung is dropped a swarm of flies dart fromthe animal to the dung and remain there a few seconds, during which time2 Dr . .J. M. Aldrich does not recognize Lyperosia, but places our American species inHaematobia.-"W. D. Pierce.