NOTES ON CORYTHUCA BULBOSA O. & D. 



Harry B. Weiss 



The following notes are the results of observations made at 

 Uhlerstown, Pa., during the first half of the summer of 1919 

 at which time and place, Corythucha bidbosa was noted on the 

 bladder nut tree Staphylea trifolia. 



On June 11 eggs and adults were present. The blackish 

 eggs were found in groups of from ten to two hundred and 

 fifty, each egg being inserted in the tissue of the lower leaf 

 surface usually more or less at right angles to the leaf. Groups 

 of eggs were noted at various places on the lower surfaces, 

 but in most cases they seemed to be near the edges. The 

 adult feeding was scattered and showed as light spots on the 

 upper surfaces. On June 24 many eggs were found, a few 

 adults and first, second and third stage nymphs. The nymphs 

 were feeding in colonies on the under leaf surfaces. The 

 individuals of a colony tend to scatter out somewhat and the 

 groups are not as compact as those of Gargaphia tilicE. 



On July 8 adults were missing, but all stages of the nymphs 

 were present with fourth and fifth stages most plentiful. These 

 were shining brownish-black or black in color. A very few 

 eggs still remained unhatched. The leaflets bearing the fourth 

 and fifth stages were badly injured, many of them being per- 

 fectly white and some from which the nymphs had moved were 

 dried and curled. On July 12 the first adults appeared. While 

 an opportunity for visiting this locality again was not afforded, 

 it is extremely probable that this insect is two brooded as in 

 this latitude most species of Corythucha are and as adults 

 collected in Ohio and received from Mr. C. J. Drake bear the 

 date September 30. 



EGG. 



Length 0.65 mm. Width 0.18 mm. Subelhptical, slightly 

 curved, one side almost straight; basal portion with rounded 

 tip; extremity of apical and truncate with rim-like collar and 

 central projecting cone-shaped nipple; sides of apical third 

 almost parallel; widest across middle third. Entire surface 



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