Americana 



VOL. VI. 



BROOKLYN, AUGUST, 1890. 



No. 8. 



PREPARATORY STAGES OF DILOPHONOTA 

 EDWARDSII Butl. and D. ELLO Linn. 



BY HARRISON G. DYAR. 



Mr. Henry Edwards has described some of the stages of the 

 first of these species,-'^ and he is the only author who has described 

 any stage but the mature larYa of the second, and, as his descriptions 

 were made from prepared specimens and chft'er from mine, I haYC 

 concluded to publish the following. Mr. Edwards implies six larval 

 stages for both species, which I do not find to be the case, and he 

 has confounded the pup:e, describing that oi elio and edivardsii, and 

 that of edzcardsii for ello. 



The eggs are laid singly on the underside of the leaves of the 

 food-plant. In shape they are elliptical, slightly flattened above 

 and below, very minutely punctured. Color light yellowish green. 

 Greatest diameter about i.S mm. 



First Larval Stage. — Head whitish, eyes black. Body pale 

 whitish, transversely creased, the caudal horn whitish at base, the 

 rest black. Length 4 mm. It is held nearly erect. Feet concol- 

 orous with body. Length of larva 7 mm. As the stage advances 

 the insect becomes pale green. Duration of this stage about four 

 days. 



Second Larval Stage. — Head pale green, not shiny; eyes 

 black; mouth very slightly brownish. Body long and slender, an- 

 nulated. Caudal horn greenish white, minutely spinose, 5 mm. 

 long. Length of larva about 15 mm. Duration of this stage four 



days. 



* Ent. Amer. vol. iii, p. 165. 

 Entomolog:ca Americana. \o1. \"I. 8 



AuGVST, 1S90. 



