HOUSEHOLD AND CAMP INSECTS 19 



The surroundings of the camp should be given careful attention 

 and the dump located so that the usual breezes will carry odors 

 and insects past or away rather than toward the camp. A little 

 discrimination in the location of picket lines will lessen the chances 

 of flies attracted by the animals drifting into camp. A few fly 

 traps along picket lines would materially reduce the numbers of 

 flies in such places, and here it may be advisable to employ more 

 offensive baits than would be tolerated within the camp limits. It 

 is very desirable that all structures within a mile of camp should 

 be kept in a good sanitary condition, and it may be necessary to 

 extend military supervision to a greater distance, since camps near 

 insanitary settlements, city or village dumps, etc., are very likely to 

 be seriously troubled by flies. 



Little House Fly 

 Fannia canicularis Linn. 



This small fly is found rather commonly upon windows in houses 

 and is frequently mistaken for an under-sized or young house fly. 

 It is recorded 42 as being more abundant for a short time during the 

 early part of the summer than the house fly. 



The maggots may be found in decaying and fermenting organic 

 matter, including excrement. They are very different from those 

 of the house fly in that the body segments are ornamented with 

 transverse series of moderately long, somewhat spiny processes. 

 The development of the larvae requires a week and may last for 

 3 or 4 weeks. The pupal period occupies 7 to 21 days or longer. 



A closely related species, F . s c a 1 a r i s Fabr., is called the 

 latrine fly, 43 on account of its commonly breeding in human excre- 

 ment. Its habits are very similar to those of F. canicularis. 



Cluster Fly 

 Pollenia rudis Fabr. 



This fly is responsible, possibly more than any other, for a widely 

 current belief that the house fly winters in dwellings. It is the one 

 commonly found in such places during the winter and early spring, 

 and has received its common name because of its frequently enter- 



42 Hewitt. The House Fly, p. 187. 1914. 



43 Hewitt. The House Fly, p. 193. 1914. 



