Entomological Contkibutions. 145 



or accompanying tubercle. Length from five-tenths to six-tenths of 

 an inch ; diameter from two-tenths to one-fom-th of an inch. 



The larvoB were found very abundantly at Center on the 6th and 

 20th of August, 1869, feeding on the different species of Quercus, on 

 Yacciniura, on Pteris aquilina^ and on other plants ; they were all, 

 at this time, in their white coats. On the 27th of August, at one 

 locality at Center, on a gently sloping hill-side, a thousand individuals 

 could have been taken by a collector in an hour's time : at this date, 

 a few had assumed the brown coat indicative of their fourth molt, 

 and by the 8th of September, nearly all had undergone this change. 

 At a locality frequently visited, in Bethlehem, near Albany, but one 

 individual was observed during the season, on September 14th. 



Notwithstanding the remarkable abundance of the larvae at Center, 

 the imago has not been observed by me, either in that locality or 

 elsewhere. 



During the last of August, 1870, the larvge were again observed in 

 large numbers at Center, but not so abundantly as in the previous 

 year. Of about twenty collected, nearly all, when in their third and 

 fourth stages, gave out a parasitic larva, which transformed into 

 pupie, apparently of some species of Tachina, but of which I did not 

 succeed in obtaining an imago, l^one of my collections of the preced- 

 ing year were thus affected. Mr. C. Y. Riley informs me that his col- 

 lections of the larvge, made in 1870, in the vicinity of St. Louis, were 

 also destroyed by probably the same parasite, which he was equally 

 unsuccessful in carrying to maturity. 



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