thoracic segments unarmed; first 8 abdominal seg- 
ments each have a large forward projecting promi- 
nence ending in a bifid ridge; a pair of small, dor- 
sal tubercles on 9th abdominal segment 
Nerice bidentata. 
(2) Oak, beech, elm, maple—Head orange red; body 
smooth, naked, shining and increasing in diameter 
to orange-red enlargement on 8th abdominal seg- 
ment; a yellow, subdorsal and a yellow, stigmatal 
stripe and several fine blackish lines 
Symmerista spp. 
(3) Oak and beech—Head bilobed and pale, with dark 
brownish, branched band on each side outlining 
whitish patches on the face; large, slightly cleft 
dorsal tubercle on 1st abdominal segment; smaller 
brownish tubercle on 8th abdominal segment; body 
color pea green with shades of brown 
Dicentria lignicolor. 
(4) Poplar and willow—Head oval, flattened in front, and 
vertex slightly lobed; body pearl gray, somewhat 
marbled with brown and marked with a reddish 
brown, dorsal line from head to 2nd tubercle; 
conical tubercles directed posteriorly on 2nd and 
3rd segments; prominent hump on 8th abdominal 
Seoment 2h) i et. hee Hyperaeschra stragula. 
29. Body naked, with two anal projections 
(1) Poplar, willow, wild cherry—Prothorax with lateral 
tubercles wider than the head; body green and 
brown, tinged reddish or purplish, and tapering 
gradually to the rear; anal legs filamental and 
BVOVOD NY Wes TOONS MOVIL” soars sa msccresrserncnes Cerura spp. 
(2) Beech, maple, poplar, oak, etc. —Head conical, pinkish 
on sides; thickest in middle, a yellowish dorsal 
stripe; filamentous and legs not quite as long as 
body aismthichksiic.. a eee Fentonia marthesia. 
(8) Hackberry—Head broad and armed with branched 
antlers; body greenish often marked with yellow 
stripes and spots, widest in middle and tapering 
toward each end. Two anal projections 
Asterocampa spp. 
30. Measuring worms—not over 1 inch long 
(1) Birch (gray and paper)—Body green to yellowish 
brown, with fine yellow ten lines and a broad sub- 
spiracular SUPIPC Wels ee. | Brephos infans. 
(2) Elm, apple, etc.—Light green to dark brownish green ; 
darker dorsal stripe; rudimentary prolegs on 5th 
abdominal segment .................. Alsophila pometaria. 
(3) Elm, apple, etc.—Reddish or yellowish brown _ to 
greenish; body lines numerous and _ irregular, 
sometimes almost invisible; prolegs on 6th and 
anal segments only ...Paleacrita vernata. 
(4) Hemlock—Head broader than thorax, brown, and bi- 
lobed; body greenish tinged with redish brown; 
286 
