SUBFAMILY ERIOSOMATINAE 351 
On leaves and tender twigs of Ulmus fulva we have taken a form which 
seems structurally indistinguishable from E. crataegi. It causes a leaf-curl cluster 
similar to E. lanigerum on Ulmus americana but differs from. that species in the 
character of the secretion which froms long filiments instead of forming a fluffy 
covering; also time of leaving the galls by spring migrants was observed to be 
later in this form. Colorado: Denver and Fort Collins. Apterous and alate vivi- 
parae July 11 to 24 and Sept. 11 to Oct. 19; in large colonies; rare. 
Chief Distinguishing Characters. Black color of body also appearing in 
crushed specimens, two long filaments of ccttony secretion extending posteriorly 
and dense felty covering on dorsum instead of fluffy mass, large size of body, 
large cornicle pore (.10 in diameter in apterous vivipara, .05 in alate vivipara) 
and number of sensoria (3-7) on base of VI. 
Genotype Eriosoma lanigerum (Hausmann) 
The Woolly Apple Aphid (Plate VI) 
On apple: 
Aphis lanigera Hausmann, 1802:440. 
Schizoneura lanigera, pilesse: 1908d:306 and 1915a:100; Patch, 1913b:264 and 1916: 
330; Baker, 1915:1; Maxson, 1915:367. 
Eriosoma lanigerum, Becker, 1918:3; Simms, 1927; Marchal, 1928:1; Theobald, 1929: 
275; Hori, 1930:35; Gillette and Palmer, 1934: 210; Schoene and Underhill, 1935: 1; 
Heriot, 1938: Feb. 16; Cox, 1939 :477. 
On elm: 
Schizoneura americana Riley, (misidentification), Gillette, 1898: Fig. 32. 
Schizoneura lanigera, Patch, 1913b:264 and 1916:329. 
Eriosoma lanigerum, Gillette and Palmer, 1934:210. 
Eriosoma rosetti Gillette (in List and Gillette), 1936:3 (nomen nudum). 
Eriosoma crataegi (Oestlund), Heriot, 1938: Feb. 16. 
Hibernating Young Apterous Vivipara. Very dark dusky green, appearing nearly black 
especially on head and thorax; often dingy yellowish brown, lighter after feeding; naked; 
appendages and distal end of rostrum dusky brown. Body length .65-.75; antenna .27, five- 
segmented; a pair of hairs at bases of tarsal claws slightly knobbed. 
Hibernag ing. 
SEL RE SL 
07 07. 064.02 sd Be 
pao 
V. 
Menno) eS (.33- 
TMC PTH I 
a50) (Sen. "30 - 28) W/OEENy Mn. 
Root Galls 
Fig. 421. Eriosoma lanigerum on apple 
Apterous Summer Vivipara. Pinkish to reddish brown, darker on tip of abdomen; cov- 
éred with fluffy waxy secretion; antenna dusky, tibiae yellowish to slightly dusky. Body 
length 2-2.5; across eyes .45; hind tibia .50; antenna .55-.59; cornicle with pore .06-.07 in 
diameter, on slightly raised base which bears scattered hairs; rostrum attaining 2d-3d coxa. 
Alate Vivipara. Color same as apterous summer vivipara. Body length 2.2; across eyes 
.45; fore wing 2.8; hind tibia .75-.90; rostrum hardly attaining 2d coxa; cornicle with pore 
.05 in diameter. 
Ovipara. Apterous. Rusty yellow to rusty brown. Body length .85; antenna .20, five- 
segmented, III+IV (coalesced) .045, V .047, VI with unguis .047. Cornicle and rostrum ob- 
solete. 
Male. Apterous. Yellowish to dusky brown to dark green. Body length .50-.55; antenna 
.20, heavy, III+I1V (coalesced) .047, V .037, VI with unguis .063. Cornicle and rostrum ob- 
solete. 
