24 PROCEEDINGS OF THE NATIONAL. MUSEUM. vol. 61. 



Adults began emerging May 9, 1913, and continued to issue until 

 May 24, 1913. Parasites emerged May 24 and June 11, 1913. This 

 species has also been collected at Dismal Swamp, Virginia, and East 

 River and Lyme, Connecticut. 



PTERONIDEA CORYLUS (Cresson). 



^^^5,_The eggs are laid in August about first to middle of month. 

 They are placed in slits made in the midrib of the hazel leaf on the 

 under side. The egg is about 1 mm, long and 0.25 mm. wide ; oval. 

 Hatching: In hatching the eggs seem to become distended just be- 

 fore it is time for the young larvae to emerge. A bubble-like pro- 

 trusion appears, sometimes in the middle and sometimes at one end 

 of the egg membrane. This bubble seems to disappear as soon as the 

 larva begins its struggle to emerge. The larva usually emerges from 

 the shell, head first, but sometimes backs out. It rests for one or 

 two hours before beginning to feed. 



Larva. — Stage VI. 



Structure. — Similar to P. alnivora. 



Color.— Head: Blackish. Body: Similar to P. alnivora but less 

 dark brown. 



Cocoon.— 9 mm. long by 4 mm. in diameter; single-walled; me- 

 dium texture; capsule- shaped and brownish black in color; is spun 

 in ground. 



Host. — Oorylus, species. 



/?emar7.;5.— Described from material collected July 21, 1915, at 

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

 U. S. number 10752*. These larvae were found feeding gregariously 

 on the edge of the leaves. The first cocoons appeared August 2, 

 1915, and cocoon spinning continued until August 17, 1915. Adults 

 emerged August 20 to September 9, 1915. 



Genus PRISTIPHORA Latreille. 



PRISTIPHORA BETULAVORA Rohwer. 



Larva. — Stage VI. 



Structure.— Head : Similar to Pteronidea; antennae of the cone 

 and disk type, cone about as long as basal diameter, consisting of 4 

 joints; maxilla with palpifer and 4-jointed palpus, apical 2 palpi 

 joints small, second basal joint with process at apex on inner side, 

 lacinia broad and flattened with an unbroken row of setae on apical 

 margin (similar to P. winnanae) ; labium with palpiger and 2-jointed 

 palpus. Thorax : The tergum is composed of A, B, C, and D and a 

 rather large alar area in the mesothorax and metathorax ; the x^leu- 

 rum is composed of preepipleurite, postepipleurite, prehypopleurite, 

 and posthypopleurite, which are similar to Pteronidea; and the legs 



