Families Micropezidse, Sepsidae, Psilidas and Diopsidse 



is cylindrical and tapers 

 toward the anterior end. 

 It completes its growth 

 in from seven to eight 

 days, and if the food sup- 

 ply is sufficient, it does 

 not move much, but 

 when mature it jumps 

 in an extraordinary way, 

 from which it derives its 

 name of cheese skipper. 

 The leap is made by 

 bringing the two ends of 

 the body together, and 

 suddenly releasing them 

 like a spring. In this way 

 they sometimes jump 



Fig. 103. — Piophila casei : a, larva; ^^H 



b, puparium; c, adult. J3- \ / 



three or four inches. 

 When full grown it 

 moves away to some 

 dry spot, contracts and 

 assumes a yellowish 

 color, the skin hard- 

 ens, and within the 

 last larval skin the 

 pupa is formed. In 

 ten days the adult fly 

 issues. As a cheese 

 insect in this country 

 this fly does not play 

 as important a part as 

 it does as an enemy to 

 smoked meat. In Eu- 

 rope, it is noted prin- 



Fig. 104. — Nemopoda minuta. (Author's 

 illustration. J 

 1 So 



