52 PARASITES OF THE DOMESTIC ANIMALS 



twenty per cent, is also recommended for this purpose. An ordinary 

 machinist's oiler affords a practical method of applying such agents. It 

 has the advantage of deep application without waste of the material. 

 For deeply infested wounds a final packing of oakum and oil of tar should 

 be applied, and this should be covered by a protective dressing of tar 

 and oakum as a prevention from further attack. 



Sarcophaga Sarraceni^ 



A flesh fly. — Muscidse (p. 37) . In markings somewhat similar to the 

 house fly, but considerably larger. The general color is light gray; eyes 

 reddish brown. Body spiny. 



The female deposits larvae upon fresh meat, or in the wounds of living 

 aJiimals. Under favorable conditions the larval stage is completed in 



about six days. The 

 ^rf«?^ z. ^fei^MOT^ ^^^^fefe^ mature larvae crawl to 



a convenient shelter 

 where they undergo a 



Fig. 27.— Metamorphosis of the flesh fly (Sarcophaga): PUpatlOn from whlch 



a, eggs;b , young larvse just hatched; o, d, full-grown larvae; the adults iSSUe in irom 



e, pupa; f, imago (after Orton, by Dodge; Copyright, 1894, twelvC to fourteen 



by Harper & Brothers) . ^^^^ ^p.^ 37) . 



Protection. — The flesh flies are of world-wide distribution, and are 

 of most importance as they affect fresh meats in the household or meats 

 in storage. As a protection in such cases the flies should be screened off 

 at some distance, as larvae which have been deposited in the vicinity of 

 meat wiU crawl to it, though it may not be accessible to the flies. 



To prevent their attack upon wounds, the same general procedure 

 may be adopted as recommended for the preceding species. 



Calliphora Vomitoria 



Blowfly. — Muscidae (p. 37). Somewhat larger than house fly; eyes 

 brownish in color; abdomen bluish green with metalic luster and usually 

 poUinose. 



The eggs are oval, white in color, and are deposited upon decomposing 

 animal and vegetable matter and in woimds of animals. Hatching may 

 occur in from a few hours to one or two days, the shorter periods occurring 

 in hot weather. After from three to niae days of feeding, the matured 

 larvae seek the ground, become buried for a short distance, and in this 

 location enter upon their stage of pupation. The time required for the 

 entire Ufa cycle, including a prepupal period of several days, may be 

 from two to five weeks, depending greatly upon temperature. Under 

 ordinary conditions it would probably occupy about three weeks. 



The blowfly agrees with the flesh fly in its habits, with the exception 



