abdomen or with head, antennae, thoracic lobes, 
sternal plates, and cornicles black or yellowish to 
apple green; antennae rather hairy 
Periphyllus 
Butternut: On leaves; 114 to 2 mm. long; pale yellow, 
costal vein yellow or brown, or a brown band ex- 
tending beyond stigma; antennae ringed with 
DEOWiine teeth Ain eee Wer area Monellia 
Elm: Causing mottling or dropping of leaves; 114 to 
2 mm. long; green or greenish-yellow, abdomen 
uniformly colored or spotted dusky 
Myzocallis 
Hickory: 
Large species, about 6 mm. long; mostly on 
branches and twigs; ash gray with triangular 
spots on pronotum covered with bluish-white 
GUN OSEUV getter. race Oey eee tt © ee certine Longistigma 
Smaller species, 1144 to 2 mm. long; occurring 
on leaves: 
Causing mottling or dropping of leaves; 
green or greenish-yellow, abdomen uni- 
formly colored or spotted dusky 
Myzocallis 
Pale yellow, costal vein yellow or brown or 
a brown band extending beyond stigma; 
antennae ringed with brown ......Monellia 
Linden: On underside of leaves; 2 to 3 mm. long; 
yellow; antennae uniformly yellow or ringed with 
EOWA LN RE A, ee Myzocallis 
Maple: 
Brownish, often covered with white flocculence: 
Without white flocculence; egg-laying fe- 
males with 7th and 8th abdominal seg- 
ments prolonged into ovipositor 
Drepanaphis 
Usually with white flocculence; 4th anten- 
nal segment about one-half or less as long 
as third segment; length 2 to 4 mm.; al- 
ways with white flocculence on underside 
of leaves or on trunks .............. Prociphilus 
Either yellowish, reddish, or shading to green: 
On soft maple leaves and twigs; 3 to 4 mm. 
long; dusky reddish to dark yellowish- 
GRECH EY Oe ch, SOLE eS Se Pterocomma 
On Norway and sugar maple, on underside 
of leaves; 2 to 214 mm. long; yellowish- 
green marked with brown on thorax and 
abdomen, or with head, antennae, thor- 
acic lobes, sternal plates, and cornicles 
black or yellowish to apple green; anten- 
mae xather jhainy $26. ee Periphyllus 
On Norway, sycamore, or English maple, 
on underside of leaves; 2144 to 3 mm. 
long; yellow or reddish to green, with 
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