568 NEW YORK STATE MUSEUM 



Poplar sawfly 



TricIiiocaDipus vi)iiiiialis Fallen 



Orange-yellow, black-spotted larvae, al)out ? 'm inch long, feed side l)y side on the 

 foliage of pojilars in the early jiart of June. 



This species was brought to notice liy Dr J. A. Lintner, under the 

 name of A 11 1 a c o m e r u s lutescens as he was imaljle to refer it to 

 an\' tlescribetl sjiecies. 



Life history. He states that he found a number of the larvae in the 

 early jjart of J luie feediny in parallel rows side by side, on two leaves which 

 had been eaten from the tii)s, downward. The scars made by oviposition 

 were observed on the leaf stalks and on the leaves, 30 in the case of one, 

 and 28 in the case of the other. He adds that both lots were probably 

 deposited Ijy one female. The larvae feed heartil)-, and when all Init the 

 basal parts had been eaten on one leaf it was abandoned for another. In 

 some cases some of the !aro;er veins were left uneaten. The larvae fed in 

 C(im])anv till mature, though as the)' a[)proach this period, they separate 

 into smaller groups and would at once do so if disturbed by the removal of 

 some from the leaf. They commenced to spin irregular cocoons between 

 the leaves on which th(/y had been feediuL,^ June 25, and by the 27th all 

 had spun uii. The perfect insects appeared July 13 to 18. A second brood 

 of this species was observed in Augaist. A large numljer of leaf petioles 

 bore the marks of oviposition, the eggs being placed in two parallel rows 

 on oppfjsite sides, usually on the ui)per side of the leaf stalk, the rows 

 ajjparently being made one after another, as they were seldom of equal 

 length, antl each for the most part, having the punctures in a perfectly 

 straight line. The foliage of the infested trees was so badly eaten that it 

 was necessary to pick off such infested leaves as could be conveniently 

 rc^ached, in order to destroy the larvae and prevent further depredations. 

 'Jhe work of this insect was also observed by Dr Lintner on other trees 

 that same year. The )dung of this second generation were not carried to 

 maturity, and consecjuentl}' nothing fiu'ther could be learned regarding its 

 life history in America. This species is stated by an European authority 



