350 APHIDS OF THE ROCKY MOUNTAIN REGION 
Alate Vivipara. (On Amelanchier). Same as alate vivipara on elm. 
Ovipara, Apterous. Bright yellow to sordid amber; appendages pale. Body length .7; 
antenna .18; legs short and stout; tarsi one-segmented; rostrum lacking. Laying single egg. 
Male. Apterous. Brown. Body length .4; antenna .2 long, five-segmented; rostrum lack- 
ing. 
r Egg. Newly laid, bright, shining yellow almost orange; later, black. Size .50 by .20. 
Collections. As winter host, in curled leaves of Ulmus americana, (leaves 
rolled on underside); as summer host, roots, base of trunk and leaves of Ame- 
lanchier alnifolia. Throughout region. Fundatrices on elm May 18 to June 24; 
apterous summer viviparae on elm May 19 to July 19 and Sept. 28, on Ame- 
lanchier* June 9 to Oct. 23; alate viviparae (spring migrants) on elm leaves 
June 2 to July 26, on elm** bark (fall migrants) Aug. 24 to Oct. 18, on Amelan- 
chier* July 9 to Sept. 20; sexuales Oct. 6; common. 
Chief Distinguishing Characters. Length of IV, V and VI (sum of which 
exceeds length of III in alata), length of III in fundatrix (.20-.25) and nature of 
leaf deformation on elm. 
This species is very close to E. lanigerum. 
Eriosoma crataegi (Oestlund) 
Schizoneura crataegi Oestlund, 1887:27. 
Eriosoma crataegi, Baker, 1915:15; Gillette and Palmer, 1934:211; Heriot, 1938: Feb. 
16; Cox, 1939:477. 
Apterous Summer Vivipara. Dark slaty; appendages brownish; woolly secretion form- 
ing two long filaments from tip of abdomen, covering on dorsum dense and felty, not fluffy. 
Body fluid from crushed specimens dark brown to black. Body length 2-3; across eyes .43; 
hind tibia .55-.70; antenna .70-.80; rostrum attaining 3d coxa. Cornicle showing as a large 
pore,-.10 in diameter, with chitinized bow on medioanterior side and on slightly raised base 
which bears scattered short hairs. Wax glands in four rows, one pair dorsal and one lateral. 
(.09=,15)(.14--.17) 610 )+-02) 
TTT 
NLT) on a 
(338) CS eS 
Fig. 420. Eriosoma crataegi 
Alate Vivipara. Head and thorax dull black; abdomen slaty black, slightly lighter on 
the ventral surface; antenna, rostrum and legs brownish; dorsum with secretion in cottony 
projections. Body length 2.1-3; across eyes .42; antenna .77-1.10; hind tibia .80-1; rostrum 
attaining hardly to 2d coxa. Cornicle a mere pore .05 in diameter, with chitinized bow half- 
way around and on slightly raised base which bears scattered short hairs. Fore wing 4.1 long. 
Ovipara. Apterous. Golden yellow, often with head slightly green. Eyes black. Body 
length .75; antenna .16; legs very short, anterior pair very little longer than antenna. Rostrum 
lacking. 
Male. Apterous. Dusky yellow. Size much smaller than female; antenna apparently 
six-segmented, V longest. Rostrum lacking. 
Collections. On stems of Crataegus sp. Colorado: Denver, Boulder and Fort 
Collins. Apterous summer viviparae July 8 to Oct. 3, alate viviparae Sept. 3 to 
Oct. 27, oviparae obtained Nov. 2 (deposited by imprisoned fall migrants); not 
common, They seem to all leave the Crateaegus in the fall.** 
*The alternate, summer host, Amelanchier sp. has been demonstrated by Patch (op. 
cit.) and confirmed by L, C, Bragg co-worker here but the specimens here listed have 
been determined by comparison as have the fall migrants on elm bark in the fall and 
there may be some uncertainty as to whether the sexual forms are confused with the 
rosette forming species. 
**Heriot (op. cit.) reports this species as migrating to U/mus americana and there pro- 
i panel ge se galls. However, Cox (op. cit.) maintains that this species does not 
migrate to elm. 
