er me ram RET 
black markings or bands; legs and cor- 
nicles yellow to dark orange 
Drepanosiphum 
On underside of leaves; 214 mm. long; 
olive green or pale sordid green 
Drepanaphis 
Oak: 
Causing mottling or dropping of leaves; 114 to 
2 mm. long; green or greenish-yellow, abdo- 
men uniformly colored or spotted dusky 
Myzocallis 
On leaves; 114 to 2 mm. long; pale yellow; costal 
vein yellow or brown or brown band extend- 
ing beyond stigma, antennae ringed with 
brown i hee eee eee ee eee Monellia 
On underside of leaves; 2 to 3 mm. long; yellow, 
antennae uniformly yellow or ringed with 
Drown ee eee ee ee Mayzocalits 
Poplar: 
On sprouts or tender growth; 2 to 214 mm. long; 
yellowish or greenish, with brown mottling; 
head: brownie. a eee Chaitophorus 
On leaves and twigs; 3 to 4 mm. long; dusky 
reddish to dark yellowish-green 
Pterocomma 
On leaves and twigs; about 5 mm. long; ash 
gray due to white pruinosity over base color 
of brown, abdomen marked with black spots; 
large black tubercle on 4th abdominal segment 
Lachnus 
Sycamore: 
Length about 6 mm.; body covered with bluish- 
white\ PEUINOSIty | 27 ee Longistigma 
Length 2 to 4 mm.; covered with white floccu- 
ETI CEs ieee ae es coe opie eres enn Prociphilus 
Walnut: On leaves; 114 to 2 mm. long; pale yellow 
or brown, or brown band extending beyond 
stigma; antennae ringed with brown 
Monellia . 
Willow: 
Length 3 to 4 mm.; dusky reddish to dark yel- 
lowish-green ............ _Pterocomma 
Length about 5 mm. - ash. gray due to pruinosity 
over base color of brown, abdomen marked 
withdarkespotse. . 70. ee ee Lachnus 
The giant bark aphid, Longistigma caryae (Harris), the largest 
of all North American aphids, occurs throughout much of Eastern 
United States and feeds on a wide variety of deciduous trees such 
as elm, pecan, sycamore, oak, maple, basswood, birch, beech, wal- 
nut, and willow. Adults are about 6 mm. long, and are covered 
with a bluish-white bloom. Males are winged; egg-laying females 
wingless. Eggs are laid on twigs, a single female laying many. 
The aphids usually occur in clusters on the undersides of twigs 
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