COLLECTING AND PRESERVING INSECTS BANKS. 



23 



plicated metamorphosis. The first larva, called a triungulin, is 

 a minute insect with six long legs and a pair of bristles at tip 

 of body. All stages should 

 be mounted upon slides. 



TRICHOFTERA. 



Fig. 45.— A caddicefly, larva, and its case. (From 

 Packard.) 



This order includes the 

 caddiceflies (fig. 45), or 

 watermoths. They have 

 a general resemblance to 

 moths, or millers, but have 

 hairs instead of scales upon 

 the wings and body. Many 

 are attracted to electric 

 lights. The antennae are slender and simple, the hind wings broader 

 than the fore pair, and the posterior part folds as a fan. The adult 

 insects have very weak mouth-parts and take no nourishment. The 

 larvae and pupae live in the water of ponds and streams. Many of 

 them make cases of pebbles, sticks, or leaves, which they carry about 

 with them. Others spin a web or net in the water. The former live 



upon aquatic vege- 

 tation; the latter are 

 predaceous. They 

 pupate within their 

 cases, closing up 

 the entrance with 

 a mesh of threads. 

 None of them are 

 of economic impor- 

 tance, and they are 

 most abundant in 

 the colder parts ot 

 the country. 



LEPIDOPTERA. 



This order com- 

 prises the butterflies 

 (figs. 46, 131, 132) 

 and moths, or millers 

 (figs. 133, 134, 158). 

 The handsome col- 

 ors of many species 

 have made this order the most popular one with entomologists. 

 The metamorphosis is complete, and the transformation from the 

 pupa or chrysalis to the butterfly has been a marvel to all observers, 

 and frequently applied to human life. The beauty of these frail 



Fig. 46.— A butterfly, Euptoieta clattdia: a, Adult; 6, cater 

 pillar; c, chrysalis. 



