COLLECTING AND PRESERVING INSECTS BANKS. 



27 



Fig. 54.— A Tineid moth, Tischeria malifoliella: a, Moth; 

 6, same, wings closed; c, caterpillar; e, pupa; d, f, en- 

 larged PARTS. 



137) have rather triangular wings. Their larvse often web up the 

 leaves upon which they feed. The Tortricids (Tig. 53) are known 

 as leaf-rollers, since the larva 1 of many species roll and fasten up the 

 leaves, within which they 

 feed and complete their 

 transformations. Others, 

 as the injurious codling 

 moth, bore into fruit, stems, 

 etc. The Tineid moths (fig. 

 .54) are the most minute in- 

 sects of this order, and 

 many are of the most glit- 

 tering colors. The larvse 

 of many kinds mine be- 

 tween the upper and under 

 surfaces of leaves, forming sinuous lines or blisters. Others carry 

 a case about with them, at least for a part of their lives. Their 

 wings are long and slender, and their legs and palpi are often pro- 

 vided with dense brushes 

 of scales. 



This order includes the 

 true flies, those insects 

 with but one pair (the 

 anterior) of wings. The 

 hind wings are replaced 

 by a- pair of short, slen- 

 der, knobbed filaments 

 called halteres, poisers, 

 or balancers. The 

 mouth-parts of Diptera 

 are quite distinct from 

 those of other groups, 

 and formed for sucking 

 liquids, but there is never 

 a curled sucking tube 

 like thai of theLepidop- 

 tera. The body is usu- 

 ally provided with hairs, 

 or, in some cases, as the mosquitoes, with scales. The 



Fig. 55. — A crane-fly, Tipula infuscata. 



bristles 



metamorphosis is complete. The larva 3 are footless, and called mag- 

 gots. The pupa is exposed, not in a cocoon, but in many forms the 

 pupa is formed within the hardened larval skin. This is called a 



