LEPIDOP^ERA. 201 



which are really not veins at all. These veins vary greatly 

 in their arrangement in different moths and butterflies, 

 and are used as a basis of classification. 



FIG. 86. Army- worm moth (Leucania unipuncta\ From Riley. 



While the larvae are biting insects, the adult is adapted 

 for taking liquid nourishment by means of a so-called 

 " tongue" which when not in use is coiled beneath the head 

 like a watch-spring. This tubular structure, which, in 

 function, is so like the beak of the bugs, is much different 

 in structure, as it is formed by the union of the two max- 

 illae, while the other parts labrum, mandibles, maxillary 

 palpi, and labium, are present, but in a more or less reduced 

 condition. 



There are two great divisions of the Lepidoptera, the but- 

 terflies and the moths of common language. The day-flying 

 butterflies hold the wings erect over the back when at rest, 

 and they have the antennae enlarged into clubs at the tip. 

 In the moths, which are mostly nocturnal, the wings are 

 carried nearly horizontally when at rest, and the antennae, 

 while frequently feathered, are never clubbed. 



Among the smallest, and at the same time the most 

 troublesome, of the moths are those pests, the clothes-moths 

 and their relatives, which do such damage to woolen goods, 

 furs, etc. These are among the few larvae of moths which 



