IDENTIFICATION OF INSECTS INJURIOUS TO CROPS 91 



(c) Brownish flattened tick-like insects sucking the blood; common on lambs in 

 spring. — Sheep Tick (Melophagiis ovinus), p. 279. 



B. Cattle 



(a) Swellings or "warbles" along the back in winter; bee-like flies bothering 

 cattle in June and July. — Ox-warble {Hypoderma linealum and H. bovts), p. 255. 



(b) Small flies clustering on base of horns, flanks and belly of cattle in summer, 

 causing them much annoyance. — Horn Fly {Hcemalobia scrrata), p. 272. 



(c) Slaty-colored sucking lice, often abundant on neck and shoulders of neglected 

 cattle. — Short-nosed Ox Louse {Hcematopinus etiryslernus), p. 000. Long-nosed Ox 

 Louse {Hamatoplnus vituli), p. i6g. 



(d) "Little red lice" feeding on the rough parts of the skin and on the hairs, 

 causing irritation; most abundant in spring. — Biting Cattle Louse (Trichodectes 

 scalaris), p. 100. 



(e) Hair falls off in patches and large scabs form — with much itching^due to 

 mites. Common Cattle Scab Mites (Psoroptes Communis bovis), Sarcoptic Scab Mite 

 (Sarcoptes scabiei bovis), Tail Mange Mite (Chorioptes bovis bovis). (See Farmers' 

 Bull. 1017, U. S. Dep. Ag.). 



C. Horses 



(a) Bots attached to wall of stomach — adult fly light brown; does not bite 

 but horse is worried; eggs laid on hairs of legs and shoulders. — Horse Bot-fly (Gastro- 

 philus intestinalis) , p. 258. 



(b) Similar to (a) but eggs are attached to hairs of lips and nostrils. — Chin 

 Bot-fly (Gastrophilus nasalis) and the Red-tailed Bot-fly (G. hcemorrhoidalis) , p. 259. 



(c) Large black fly that flies swiftly and bites severely, giving much annoyance 

 to horses. — Horse Gadfly (Tabanus atratus), p. 252. 



D. Hogs 



(a) Gray sucking lice, often quite large. — Hog Louse (Hmnatopinus urius), p. 

 169. 



E. Poultry 



(a) Yellowish or reddish mites infesting hens and chicks at night; piercing the 

 skin and sucking the blood, causing much irritation and often death. — Chicken Mite 

 (Dermanyssus gallincB), p. 364. 



{b) Small pale yellow active insects feeding on rough parts of skin and bases 

 of hairs and feathers, causing much irritation. — Common Hen Louse (Menopon 

 pallidum), p. 100. 



(c) Minute mites burrowing under the scales of foot, leg, comb and beak, pro- 

 ducing "scaly leg" with much irritation. Contagious. — Itch Mite (Sarcoptes 

 mutans), p. 365. 



(d) Small mites causing the feathers to break off. Contagious. — Depluming 

 mite {Sarcoptes gallince). 



