374 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



noticeable. The heavily chitinized mouthparts are visible through 

 the translucent glossy, greenish white integument. Length 6-7 mm. 

 This stage requires 15 to 17 days. Three larval instars may be noted. 

 The larva3 are capable of reentering the leaves after being removed 

 from their burrows. When the entire parenchymatous tissue of a 

 leaf is consumed, before the larva reaches its full development, it 

 migrates to another leaf. 



The "rake" or "great hooks" consist of two arms attached to 

 a bifid basal piece. The mandibular sclerites 

 bear four teeth each (Fig. 21a). 



The anterior spiracles have eight lobes open- 

 ing on the margins of a fan-shaped prominence 

 (Fig. 216). 



The posterior stigmatal areas are rather 



widely separated and each spiracle bears three 



^ stigmata arranged as in Fig. 21c. 



^ig. 21. Pegomijia hyo- The Structural details from the author's 



scyamt, a great hooks, specimens agree exactly with the description 



anterior spiracle, c^ -t. r/-. u^i. 4. 



posterior stigmatal area of P. hyoscyanii Panz. of Cameron but not 



with his figures and agree almost exactly with 

 the Riley figures of P. vicina Lint., Insect Life, Vol. 7, p. 380. 



The rL'PARiuM 



The pupa is nearly cylindricax, obtusely rounded at both ends. 

 Color light chestnut brown w^hen first formed, changing to darker 

 brown just before emergence. The anterior spiracles rise in fan 

 shape from rounded rugose bases. The posterior spiracles are slightly 

 raised on globular bases. Between the stigmatal areas are three 

 heavy ridges converging ventrallj'. The longest pupal stage observed 

 occupied 20 days, the shortest 14 days with all graduations in between 

 these extremes. 



The Adult 



The adults bred here agree in all essentials with the descriptions 

 of Stein, and Meade, as given by Lintner, with the correction noted 

 by Sirrine in Bui. 99, N. Y. Agricultural Experiment Station. 



The coloration varies in the series in individuals fron; the same host 

 plant. There are no constant color changes in the series from different 

 hosts. 



The chief point of doubt as to the identity of specimens may be due 

 to collapse of specimens killed too soon. Such specimens often have 

 the frontal stripe obscured by the orbits becoming approximated; 

 especially is this true in the males. 



