Report of the State Entomologist. 



45 



Description of the Larvs, 



When near maturity, they were seven-tenths of an inch lon^-, of an 

 oraug-e-yellow color, with two rows upon the back (sul)clorsal) of 

 twelve large irregularly rounded black 

 spots, of which the middle ones are the 

 larger, measuring in diameter about one- 

 half the length of the segment. There 

 is also a row on the side (stigmatal) of 

 twelve smaller black spots, of which the 

 two anterior ones are the largest, and 

 semicircular in form. Numerous short 

 white liairs are given out from two trans- 

 verse rows of tubercles on each segment, 

 the longest of which about equals one- 

 half the diameter of the body. The 

 head is black superiorly and laterally, 

 with a central black spot in front sur- 

 rounded with brown. The tarsal hooks 

 are brown. 



Figure 20, shows the larva in a dorsal and in a side view. 



On the twentj'-fifth of Jane the larvse commenced to spin up in irregu- 

 lar shaped cocoons, between the leaves on which they had been feedingf. 

 Ground had been given them in which to bury, if so inclined, but it 

 Avas refused. By the twenty-seventh they had all made their cocoons. 

 The perfect insects emerged July 13-18. 



Fig. 20.— Larva of the poplar saw- 

 fly, AULACOMEKUS LUTESCENS. 



Description of the Saw-Fly. 



The following memoranda of the more prominent characters of the 

 saw-fly are hastily drawn up, to serve the 

 purpose of identification, until proper 

 description can be made: 



Head, shilling black, short, broad, not 

 so wide as the thorax; antennae brown, 

 the seven long joints are slender, tapering 

 regularly to the last. Thorax black above, 

 yellow laterally and beneath, except j)os- 

 teriorly where it is black. Abdomen yel- 

 low, distinctly incised, short, flat, subo- 

 void; legs yellow. Wings yellowish toward 

 the base and particularly on the costa; Fig. 21. — The poplar saw-fly, 

 the stigma large, conspicuous, with a black Aulacomeeuslutescens, enlarged, 

 spot on its base. Expanse, 0.7 inch; length, 0.3 inch. 



The insect is shown in Figure 21, enlarged to about two diameters. 



