of 1st and 3rd abdominal segments and a single 1 
onthe Sthis..065 Se mele ee Acronicta americana. 
(8) Poplar and willow—Head, shield, and true legs black; 
body dull, whitish, clothed in long, yellow hairs; a 
single, long hair pencil on each of Ist, 3rd, 4th, 5th 
and 8th abdominal segments 
Acronicta lepusculina. | 
(9) Poplar, birch, willow—Head greenish-white or marked | 
with black; body clothed with long, fine, curved, . 
white or yellow hairs; a few bristly black hairs at 
ends of the body ............ Acronicta leporina vulpina. 
(10) Maple, cherry—Head rounded and yellowish; body 
whitish or yellowish on the back, except for a row 
of black spots; blackish beneathi; densely clothed 
with long, fine white or yellow hairs; long hair 
pencils on 2nd and 38rd thoracic segments and 
8th abdominal segment ...... Apatelodes torrefacta. 
20. Caterpillars with transverse rows of prominent, branched 
Spines on the dorsum. | 
(1) Elm—Head dark red; body brownish, mottled with 
yellow; spines light colored, some tipped with 
blacket.ck catno. cee 8 Polygonia interrogationis. 
(2) Bireh—Head black; body reddish to blackish on top, 
dotted with green; spines above spiracles black 
Nymphalis j-album. 
(8) Elm, poplar, willow—Head black, bilobed; body black, 
sprinkled with whitish dots; black dorsal line 
broken by row of 7 or 8 reddish dots; spines black; 
abdominal legs reddish ............... Nymphalis antiopa. 
(4) Various hardwoods—Head pea green and glossy; body | 
pea green with a broad, reddish spiracular stripe 
below which is a white stripe and another reddish | 
line; spiracles yellowish ringed with black 
~ Automeris 10. 
(5) Oak—Head reddish brown; body dull brown to black- 
ish, covered with small, pale yellowish dots; spir- 
acles pale; clothed with rusty, brown-tipped bris- 
tles and black or white, branched compound spines 
Hemileuca mara. 
21. Thorax with long, prominent SPINGS: «eee ace 22 
Thorax with short, blunt spines or oy enlarged tu- 
bercles 2 Prone cle) SME aS Geena re 
22. Thorax with 1 pair of spines | De eS de Se SO Sie Lat Mart 23 
Thorax ‘with’ 2-or more pairs Of Splines: sees. ee 24 
23. (1) Head bilobed and covered with small, sharp tu- 
bercles; a pair of large, barbed, club-shaped spines 
On Zndsthoraciessesment eee Limenitis spp. 
(2) A pair of slender, stiff spines, about as long as body 
is thick, on 2nd thoracic segment; other spines 
Short: ehiiuy. ise. Ree te he eee Anisota spp. 
24. (1) Elm, poplar, cherry, willow, etc—Head and hump on 
back of lst abdominal segment red, body black, 
with black and yellow lines; a double row of short, 
282 
