INSECT ENEMIES OF EASTERN FORESTS 
547 
KEY TO THE LARVAE OF SOME OF THE MORE IMPORTANT SPECIES OF SAWFLIES 
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AND HORNTAILS THAT ATTACK TREES AND SHRUBS—Continued 
Rose—length about %4 inch. Head yellowish brown with black 
markings; body metallic green and dotted with white above, 
orayish whitevon,venters = sso 22 Allantus cinctus (L.), p. 580. 
Willow, occasionally poplar—Black or greenish black with a row of 
large yellow spots on each side of body. Length about % inch. 
JO DaauaaKel pate 0 Siete pee NO neta eg es, Pteronidea ventralis (Say), p. 575. 
Body marked with one or more prominent blackish longitudinal 
GSU TENG Some ge rat SPR! yee pre MeN A re Re NS pla pas ORE EO papel 
Body without longitudinal stripes, but marked with numerous 
small black vellowish, or browmishtspots- 222 6 a ea 
Alder and birech—Head shiny black; body yellowish and marked on 
each side with a subdorsal and 2 broken subspiracular stripes of 
black. Length about % inch. June—September____Hemichroa 
crocea (Fourcroy), p. 572. 
Willow, elm, alder, basswood, birch, maple, and poplar—Head and 
body yellowish or greenish white, with a black dorsal stripe. 
Length up to 1%4 inches. Usually coiled when at rest. June— 
October ses ee We ee ete ee Cimbex americana Leach, p. 562. 
Head light or dark colored; body rather thickset, subcylindrical, 
with venter flattened; widest on abdominal segments 1 to 3 and 
tapering toward anal end; yellowish green or red; with many 
small spots, some bearing minute setae. Length about % inch. 
TUly Se PLCMMNOCH Mook: Ss eo es Re Los Arge spp., p. 549. 
Birch (gray and paper) __--__- Arge pectoralis (Leach), p. 549. 
Cherrya(wild) 32 seer eer Arge macleayt (Leach), p. 550. 
TDs Dea ee a hs led A eae Arge sp., p. 549. 
Oalkeecus Se eA ey ee a Arge sp., p. 549. 
Poison ivy and poison sumac 
Arge humeralis (Beauv.), p. 549. 
Sila ey Cle Shae ner os a Bh ole SIN Arge coccinea (F.), p. 549. 
AN WAnIMEl Gyyuype reece Mis eM Sans NED PY ota, Soe Sais Bat Arge sp., p. 549. 
Head brownish or black; body not thick-set; usually green marked 
with rows of small blackish spots or more or less broken trans- 
verse stripes on the dorsum; sides speckled, usually the spots 
below the spiracles most conspicuous. Length % to %4 inch. 
Spriosrandesummenrss eee wi ae Pteronidea spp., p. 576. 
FANG I(G US cam ba Sa Ss ea hae ee Pteronidea alnivora Roh., p. 576. 
Currant or gooseberry ____ Pteronidea ribesii (Seop.), p. 577. 
Maz elanutiee sera Sse Pteronidea corylus (Cress.), p. 576. 
Rocustes: =. earns Pteronidea trilineata (Nort.), p. 576. 
Poplar__Pteronidea populi (Marl.) and P. plesia Roh., p. 577. 
aWVaillll Oi Base eet Pteronidea harringtoni (Marl.), p. 577. 
and P. odorata (Dyar), p. 576. 
Head brown, face lighter; body rather plump, grayish green and 
marked with yellowish spots and rows of black dots. Length 
about | inch. June and July. Honeysuckle__(Lonicera) 7araea 
inflata Nort., p. 564. 
Head yellow orange, eyes black; body yellowish with all segments 
except the last marked with black spots, which are uneven in 
size and shape. Length % to % inch. June and August. 
Mountain-ash_____________Pristiphora geniculata (Htg.), p. 572. 
Larvae inhabiting nests of web, frass, and leaves_______--___-._- 
DecistolderssoM Poplar sti aus tae ae ow cal eee eee en Sov ees 
Sa eT CEG eet tte api keer wet Cree Se Ri pe) oye Obed eam Ue ge cele EEE 
Larvae inhabiting galls on leaves, leaf stems, and shoots______---- 
Marvaec inhabiting budsoramentsiom willow -==2-22 252552552 22 
Borerseim shoots, twigs; on leat stems. = ise ea eee 
Borers in wood of dead or seriously weakened trees or in dead parts 
ORS VATM OGRE CS re tether e Faar coy ell es iene fa ge EF leh gree 
Wild cherry—Larvae, prior to last instar, brown with pinkish 
dorsal line, head dark brown or blackish. Gregarious. June-— 
September______._____.._.__._Neurotoma fasciata (Nort.), p. 585. 
Sand cherry and plum—Gregarious. Webs somewhat similar to 
those of the fall webworm. June-September- --_---- Neurotoma 
inconspicua (Nort.), p. 585. 
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