AET. 21. NORTH AMERICAN SAWFLY LARVAE MIDDLETON. 23 



on inner side at apex. Abdomen: The tergiim of urites 1-9, inclu- 

 sive, is composed of areas A, B, C, and D (C slightly inclined to sub- 

 divide C^'^), B and C^ are sparsely haired, A is usually bare (occa- 

 sionally with one or two hairs), and D is bare and narrow; urite 10 

 consists of an epiproct which is sparsely haired and without 

 pseudocerci ; urites 1-8, inclusive, with the spiracle in a rather well- 

 defined spiracular area and urites 9 and 10 with the spiracle wanting 

 and the spiracular area not demarked; urites 1-7, inclusive, with 

 the alar area large, distinct, bilobed and sparsely haired, urites 8 

 and 9 with the alar area smaller, sparsely haired and not bilobed, and 

 urite 10 with the alar area wanting; pleurum; urites 1-7 with pre- 

 epipleurite distinct and separate from postepipleurite, both large and 

 sparsely haired, urites 8 and 9 preepipleurite and postepipleurite not 

 distinctly separated and forming epipleurite which is sparsely haired 

 and urite 10 with epipleurite not recognizable; urites 2-7, inclusive, 

 with hypopleurite distinct and not divided into prehypopleurite and 

 posthypopleurite and urites 1, 8, 9, and 10 with hypopleurite indis- 

 tinct or wanting; urites 2-7, inclusive, with well-developed uropods, 

 urites 1, 8, and 9 with uropods wanting and urite 10 with postpedes 

 and with a rather prominent postcallus which is thickly haired. 



Color. — Head: Black to yellow brown; portions of epistoma, 

 labrum, maxilla, labium and membranes of antennae and mandibles, 

 pale; eye disks black. Thorax and abdomen, with a broad, tergal (to 

 supraalar line) bronze brown, longitudinal band; spiracular area 

 pale but alar area bronze brown and confluent with the tergal band ; 

 preepipleurite dark brown; D posterior of the alar area and area 

 between preepipleurite and postepipleurite pale; postepipleurite 

 dark brown ; urites 2-7, inclusive, with the anterior of hypopleurite 

 brownish; uropods brown, apex pale and with large ventral spots; 

 urite 1 with small faint, brownish, lateroventral spot; venter pale; 

 urites 8 and 9 with a rather large ventral spot and urite 10 pale. 



Cocoon. — 8 mm. long by 4 mm. in diameter; capsule-shaped, 

 single- walled, of fine texture and colored blackish brown. 



Host. — Alm/s, species. 



Parasites. — Poh/terus oh/mpiae Ashmead, Eomalormna pteronideae 

 Rohwer. 



Remarks. — Described from material collected October 11, 1912, at 

 Falls Church, Virginia, by William Middleton and recorded under 

 Hopk. U. S. number 11329''2 supplemented by notes from material 

 collected same time and place and recorded under Hopk. U. S. number 

 11329 ^\ These larvae were found feeding gregariously on the edges 

 of the leaves carrying their abdomens S-shaped. On October 27, 

 1912, most of the larvae had become prepupae and cocooned— some 

 among the leaves and some in the sand on the bottom of the cage. 

 20107— 22— Proc. N. M. vol. 61 31 



