Pale green with white pruinosity. On leaves and twigs 
Mindarus abietinus 
24. On larch 2.2204 ere ee ee ee ee 
On other conifers) se 1 Se ee ee ee 
25. Appearing as white woolly masses on the needles, as 
dark individuals on the underside of twigs, or as 
clusters of dark individuals at the base of the leaves 
Adelges strobilobius 
26. Nymphs dark green. On Douglas-fir, often causing ab- 
normal toliace dropre..2- ee ee Adelges cooley 
Noti as above:...... 8.20 ie ae ee a, ee 
27. Cinnamon brown with 4 rows of black spots on abdo- 
men; length about 3 mm.; many specimens covered 
with fluffy white wax above ; body hairs long and fine. 
On black spruce branches and twigs 
Cinara abietis 
Not as'above 202 ee ee etre ee ee eco 
28. Brownish-black with a slight pruinosity, legs brown to 
black, antennae pale; length about 5 mm. On branches, 
twigs, stems, and roots of fir and Atlas cedar 
Cinara curvipes 
Pale green with pruinosity, or with white flocculent 
covering when on balsam fir; length about 2 mm. On 
fir and spruce twigs and leaves, causing curling and 
roushenine Of-twits 202. Mindarus abietinus 
29. Large species, about 6 mm. long; ash gray with triangu- 
lar spots on pronotum; body covered with bluish-white 
bloom: 
On various hosts; common on hickory and sycamore 
— Longistigma 
Smaller species, usually 5 mm. or less in length: 
Alder: Causing mottling or dropping of leaves. 
Insects 114 to 2 mm. long; green or greenish- 
yellow, abdomen uniformly colored or dusky- 
spotted. 4282 ).8U- 38%. EGE eee ree Myzocallis 
On underside of leaves or on stems. Insects 2 to 4 
mm. long; brownish, covered with white flocculence 
Prociphilus 
Beech: On underside of leaves. Insects 2 to 3 mm. 
long; bluish-white to greenish-yellow, covered with 
white. 1LocculenCe =e ea ee Phyllaphis 
On underside of branches or on trunk. Insects 2 to 
4 mm. long; brownish, covered with white floccu- 
VS acy Mi ot Site lt de ore ce apd ek eet gt .... Prociphilus 
Birch: On ieins and leaves; 3 to 4 mm. long; whitish 
to yellow, with or without black stripes on head 
and thorax and dark bands on dorsum of abdomen 
Calaphis 
On twigs and leaves; 2 to 3 mm. long; light green, 
with or without dark patch on abdomen; hind 
tibiae pale with distal part and tarsi black or with 
dark brown stripe ..... ...... Huceraphis 
Boxelder: On leaves and twigs; 2 to 2% mm. long; 
yellowish-green marked with brown on thorax and 
80 
25 
26 
27 
28 
