22 PROCEEDINGS OF TPIE NATIONAL, MUSEUM. vol.61. 



Color. — Head : As P. mendicana. Thorax : Prothorax pale, ex- 

 cepting neck plates and leg joints, which are black; mesothorax pale, 

 excepting laterodorsal blackish spots on B and C, grayish spots on 

 preepipleurite and postepipleurite and black prehypopleurite and 

 leg joints; metathorax the same but with small grayish middorsal 

 spot on A and the alar area with a siipraalar gray spot. Abdomen : 

 Urite 1 pale, with grayish middorsal spot on A, laterodorsal blackish 

 spots on A, B, and C ; supraalar blackish spots on B and one on each 

 lobe of the alar area, alar spot on the posterior lobe of the alar area, 

 preepipleurite and postepipleurite with black spots; urites 2-6, in- 

 clusive, similar to urite 1, but possessing a lateroventral spot on 

 hypopleurite ; urite 7 similar to 2-G, but without lateroventral spot on 

 hypopleurite ; urite 8 pale, excepting laterodorsal spot on B, supra- 

 alar spots on B and the alar area and blackish preepipleurite and 

 postepipleurite; urite 9 pale and with spot on epipleurite and urite 

 10 pale with large black spot dorsad caudad on epiproct. 



Host. — Populus grmididentata Michaux. 



Remarks. — Described from material collected August 7, 1916, at 

 East Eiver, Connecticut, by C. R. Ely and recorded under Hopk. 

 U. S. number 13656^^ Adults emerged August 25, 1916. 



PTERONIDEA ALNIVORA Rohwer. 



Egg. — The eggs are laid in the mid or side ribs on the under side 

 of the leaf. 



Larva. — Stage VI. 



Structure. — Head: Face view, circular in outline; epistoma and 

 labrum with 4 hairs each and epicranium and frons sparsely haired ; 

 eye disks not elevated and eye slightly convex ; antennae of the cone 

 and disk type, cone longer than basal diameter, membrane with disks 

 rather prominent, disks except outermost are bands partially or wholly 

 surrounding cone, outermost a free plate, disks 4 in number and 

 joint-like; maxilla with palpifer and 4-jointed palpus, lacinia much 

 similar to P. whwanae; labium with palpiger and 2-jointed j^alpus. 

 Thorax: The tergum is composed of areas A, B, C, and D; A, except- 

 ing in prothorax, B and C are sparsely haired; A of the prothorax 

 is bare and constricted, D bare and narrow ; mesothorax and meta- 

 thorax with the alar area enlarged, sparsely haired and well sepa- 

 rated from preepipleurite (A and B terminating in alar region with 

 acute angles) ; the alar area absent in the prothorax; pleurum; pre- 

 epipleurite rather small in the prothrorax and large in the meso- 

 thorax and metathorax, sparsely haired; postepipleurite rather large 

 and bare; prehypopleurite large, triangular, heavily chitinized, and 

 sparsely haired ; posthypopleurite rather large and sparsely haired ; 

 legs with 4 joints and an apical claw, joint 3 with small, soft pad 



