ART. 21. NORTH AMERICAN SAWFLY LARVAE MIDDLETON. 7 



thorax, not large; postepipleurite rather large; prehypopleurite tri- 

 angular, somewhat chitinized and haired; posthypopleurite of me- 

 dium size; legs with 4 joints and a claw, sparsely haired, joint 

 3 with rather long process at apex on inner side. Abdomen : Tergum ; 

 of urites 1-8 composed of A, B^--, C^---^ and D, B^ and C^ with 

 sparse, indistinct spines (fig, 3"=) ; urite 9 the same but with a sub- 

 division of C wanting; urite 10 composed tergally of the epiproct 

 which is sparsely haired and has no pseudocerci; urites 1-8 with 

 spiracular area situated in alar region, rather well defined, and with 

 a rather large spiracle; spiracular area and spiracle wanting on 



Fig. 3. — Mackophya epinota Say. a. Maxilla ; 



iXTENNA ; Cj THIKD URITE. 



urites 9 and 10; alar area distinctly bilobed on urites 1-8, indistinct 

 on urite 9 and wanting on urite 10 ; pleurum ; urites 2-8 with uro- 

 pods and distinct hypopleurite present; urites 1 and 9 with no uro- 

 pods or distinct hypopleurite present ; urite 10 with postpedes but no 

 distinct hypopleurite and with postcallus of fair size and moderately 

 haired ; urites 1-8, epipleurite divided into distinct preepipleurite and 

 postepipleurite; urite 9, epipleurite not distinctly divided, and on 

 urite 10, epipleurite not distinguishable. 



Color. — Head : Brownish spot dorsally on epicranium between the 

 posterior laterodorsal grooves ; eye disks black ; small crescent-shaped 

 brownish spot posterior of eye disks ; remainder pale yellowish green. 

 Thorax and abdomen pale yellowish green. 

 20107— 22— Proc. N. M. v.,1. 61 30 



