14 M-W Ni>KK STATE ML"Sia'.M 



first generation may spin their oval, brown cocoons in leaves or 

 oilier debris. The second generation presumably hibernate in the 

 cocoon, adults appearing the following spring and depositing their 

 eggs in minute slits on either or both sides of the petiole in series 

 of lo to 15 or even more, since Dr Liniiier records as many as 28 

 or 30 in one row. 



Description. The egg is pearl\' wliite, oval and about i mm in 

 k-ngth. its position is indicated by a slight swelling about 1.5 mm 

 long, the swellings being about i mm apart. 



Larva. The young larvae are about 6 mm long, have dark 

 brown or blackish heads and pale green or yellowish green bodies. 



Partly grozvn larva. Length i cm. Head subglobose, jet-black, 

 the most of the body being a very pale green with a conspicuous 

 row of sublateral, subquadrate, black spots, a pair on each segment. 

 The anterior portion of the body, namely the first thoracic seg- 

 ment and the lateral tubercles on the 2(1, 3d and the nth seg- 

 ments, particularly laterally, is variably tinged with pale orange, 

 giving a very characteristic appearance. The larvae are rather 

 thickly clothed with short, whitish setae arising from inconspicuous 

 tubercles. True legs pale yellowish basally, yellowish transparent 

 ?pically. The whitish transparent prolegs occur on the 2d to the 

 7ih and 8th and 9th abdominal segments, each segment also with 

 a small, black, lateral dot. Anal plate subcircular, black with whit- 

 ish setose tubercles. 



Full-grozvn larva. Length 1.5 cm. Head jet-black. Body a deep 

 yellowish orange, sparsely covered with fine, whitish hairs and with 



a conspicuous row of irregu- 



^ 



Fig. 2 Poplar sawfly, side view of larva, en- 



lar subquadrate lateral mark- 

 ings, a pair on each segment, 

 and a substigmatal row of small 

 triangular, black markings. The 

 black anal plate bears several 

 larged." (Original) pairs of submcdiaii white setae. 



Adult. Length .8 cm. Wing spread 1.8 cm. Head shining 

 black, short, broad. Antennae nearly as long as the body, com- 

 posed of nine segments, the first two short, the others long, slender 

 and tapering successively to the apex. Thorax black dorsally, the 

 venter and the abdomen yellowish. Wings yellowish basally, the 

 stigma large, distinct. Legs mostly pale yellowish, the pulvilli 

 dark brown. 



