166 



FORTY-FIBST RePORT ON THE StATE MuSEVM. 



Its Generic Reference. 

 The insect was submitted to Mr. E. T. Cresson for identification. 

 It was unknown to him, and had not been described unless it had 

 been given erroneous generic position, possibly with Nematus, to 

 which it is closely allied, but differs therefrom by the second sub- 

 marginal cell receiving both recurrent nervures. It was believed to 

 belong to the genus Aulacomerus of Spinola {Ann. Soc. Ent. France, 

 ix, 1840, 137), to which only a single North American species has 

 hitherto been referred — A. ebenus Cresson, from Colorado, with larva 

 unknown. 



A Second. Brood Observed. 



A second brood of the insect was observed upon the same tree 

 during the month of August. A large number of the foot-stalks of 

 ' ' „ the leaves at this time bore the 



marks of egg-deposit, in two paral- 

 lel rows on opposite sides, usually, 

 of a rib on the upper side of the 

 petiole. The rows had apparently 

 been made the one after the other, 

 as they were seldom of equal 

 length, and each, for the most part, 

 having the punctures in a perfectly 

 straight line. The foliage of the 

 tree was so badly eaten, that in or- 

 der that it might continue to serve 

 as an ornament, it was necessary 

 to pluck off such of the leaves 

 as could be conveniently reached 

 that had been fed upon, of which 

 only the ribs and a basal section 

 remained. Another tree of the same 

 species, which was daily passed by 

 me in one of the streets of Albany, 

 also showed the attack of this saw- 

 fly — first, in the eaten leaves, and 

 on closer observation, the larvse 



Fig. 22.- Poplar-leaf showing scars made feeding thereon, 

 in oviposition by Aulacomekus lutescens, Larvee of this brood were gath- 

 in natural size and in enlargement. ^^^^ ^^^ f^^^ ^^^ ^^^^ f^-^^^ ^^ 



secure proper care, and none of them, although a few spun up in 

 cocoons, entered into their pupal stage. 



