310 



THE STUDY OF INSECTS. 



spicuous tufts of hairs on the dorsal aspect of the abdomen, 

 and at each end of the body there are long pencils of hairs ; 

 on the sixth and seventh abdominal segments there is on 

 the middle of the back of each an eversible gland supposed 

 to be a scent-organ similar to the osmateria in the larvae of 

 Papilio, and it is stated that a fine spray of liquid is some- 

 times thrown from them. 



Excepting a few rare forms, our native species fall into 

 two genera — NotolopJius and Parorgyia, In Notoloplms the 

 males have short, broad wings ; the females are nearly 







Axrin cr/^rl 



pnH the 



wings are relatively longer than in NotolopJius. 



Our most common species belong to Notoloplms. Of this 



genus the three best-known species are the following: — 

 The White-marked Tussock-moth, NotolopJius leucostigma 



(No-tol'o-phus leu-co-stig^ma). — This is our most common rep- 

 resentative of the family. It fr'equently 

 occurs in such great numbers that it 

 seriously injures the foliage of shade- 

 trees and orchards. The male (Fig. 

 376) is of an ashy gray color ; the fore 



Fig. 376. — NotolopJius leuco- . . . 11111 



stigma. wmgs are crossed by undulated bands 



of darker shade and bear a conspicuous white spot near the 

 anal angle. The female is white and resembles a hairy grub 



Fig. 377. — Notolophtis leucostigma^ larva. 



more than a moth. She emerges from her cocoon and 

 after pairing lays her eggs upon it, covering them with a 



