ORDER LEPIDOPTERA. 



143 



veins, one of which has three branches running parallel with 

 the edge. \- the weight or pressure of the air while mak- 

 ing the stroke is borne chiefly by the front of the winj 

 needs t hese rods to strengi ben it. 



■ scales of a butterfly's wing differ much in shape on 

 different parts of the body. On tin- wing of the Cecropia 

 moth the hairs of the body and base of the wing are - 

 to [>ass into broad scales, represented in Fig. L72, They 



I i 'Mftiifc/ torn 



Fio. i ingemeiit of the scales ou a moth's n 



are attached to the wing and laid partially over one 

 another like the tiles on a roof, being inserted in irregular 

 rows.* 



The caterpillar or larva of the Turnus butterfly maj 

 found on the apple or birch and other trees. In July the 

 butterfly lavs a nearly round egg (Fig. 167, .1) upon the 

 leaf, and by the end of summer one may find the great 

 green worm in the same place. The body is round, 

 and smooth: there are twelve segments behind the head. 

 From the top of the segment next to the head is projected, 



* According to Dr. Royston Piggott, the foot-stalk 

 scale consists of two membranes united to form n tub • h ithera 

 up and distributes the nourishing fluid among the striaf i< ns or ri 

 the scale. The scale has been resolved into a series of latticed ribs, 

 connected by irregular cross bars; each rib display ii 

 margins, and the cross bars often beaded. The seal 

 make admirable tests for the highest powers of the mi< 



[nthescalesof Morphoeyprit "thecross barstru ill I 



azure blues, is most delicate, and produces glorii 

 tro&ut "is worth close investigation for reticula SIi< 



Bcopical Advances zxvii.; English Mechanic, Nov. 887J 



