A. E. Verrill—The Bermuda Islands. 741 
The common House-fly, owing to its abundance and familiarity, 
is one of the most dangerous species. Although it breeds chiefly in 
horse manure, it will also breed freely in human excrement, where 
exposed.* The Flesh-flies and Blow-flies feed as larvee on carrion or 
flesh of any kind, bones, etc., but the adult flies alight on, and doubt- 
less feed upon, human excreta, as well as upon cooked foods, fruit, 
etc. The Stable-fly breeds both in horse manure and human excreta. 
87 88 
Figure 85.—Flesh-fly (Sarcophaga carnaria) ; enlarged. Figure 86, a, b.—House- 
fly; young larve much enlarged; after Packard. Figure 87.—Blue-bottle 
(Lucilia cesar); x124. Figure 88.—Blow-fly (Calliphora vomitoria) ; x 124; 
phot. A. H. V. Figure 89.—Stable-fly (Stomoxys calcitrans) ; a, fly; x3; 
b, its head, o, eye, p, proboscis; ¢, larva, nat. size; c’ 
enlarged ; after Howard. 
, its head ; f, pupa; 
The adult fly, which closely resembles the House-fly, bites 
severely both men and horses, and is often seen in our houses and 
on food. Many other common flies have similar habits. 
Flies of all kinds should, therefore, be carefully excluded from 
the rooms of patients suffering from any contagious disease, and all 
infected material should be so disposed of that flies cannot have 
access to it. The disease germs or bacteria adhering to their feet 
. *According to Howard 1200 flies may develop in one pound of manure in 10 
days. 
