SUBFAMILY ERIOSOMATINAE - 365 
Apterous Summer Vivipara. Same as fundatrix excepting antenna which is as figured, 
body length 2-2.5, wax glands which are not evident and rostrum attaining between Ist and 2d 
coxae. 
Ovipara. Apterous. Buttercup-yellow with head and appendages whitish and trans- 
parent. Body length .70-.90; antenna .15, four-segmented, segments about equal in length, I 
and II longest. 
Male. Apterous. Pale yellowish green. Body length .60-.65. Legs very stout. 
Egg. Newly laid, dull white to yellow, glistening; later, black. Size .48-.57 by .19-.24. 
Gall. Same color as petiole but often with reddish tinge. Size, usually 12-18 mm in di- 
ameter, occasionally 25. 
Collections. As winter host on Populus sargenti in petiole galls, as summer 
host on cruciferous plants (in Louisiana, not recorded on summer hosts in this 
region, but to be expected); Colorado: throughout state. Utah: Farmington and 
Santa Clara. Fundatrices June 8 to Aug. 29, alate fundatrigeniae June 12 to 
August 31; not abundant. ' 
Chief Distinguishing Characters. Petiole gall with transverse: mouth and 
large permanent sensorium containing chitinous islands on base of VI. 
Sexupara and ovipara described and figured from Louisiana specimens 
sent by T. H. Jones. 
Pemphigus populi-venae Fitch 
The Poplar-vein Gall Aphid 
Pemphigus populi-venae Fitch, 1859:851; Thomas, 1879:154; Jackson, 1908a:194; Max- 
son and Knowlton, 1929:264; Gillette and Palmer, 1934:228. 
Fundatrix. Head black, abdomen pale with greenish tinge; appendages and rostrum 
brown. Body length 2; hind tibia .35-.40; hind tarsal II .10; antenna .30-.34. 
Alate Vivipara. Fundatrigenia. Head and thorax black; abdomen greenish; rostrum 
and appendages brown. Body length 1.1-1.8; fore wing 2.8; hamuli usually 2-3 but occasion- 
ally 4 in number; hind tibia .60-.75; hind tarsal II .15-.19; antenna .60-.80. Rostrum attaining 
nearly to 2d coxa. i 
Gall. Greenish or yellowish, sometimes with blush of red. Pocketlike excrescence vary- 
ing from oblong to semicircular on upperside of leaf with slitlike mouth on underside next to 
midrib, similar to that of P. balsamiferae but on opposite surface of leaf. 
Fundatrix acer 
Eg yee 
on eae 
Ti0-.13k (08-09) 
i Fundatrigenia(alate) Gen2-5) (sen,2 
Apeainie 
Vi regi ee me QS 
Ci7=.2ayeen.7-12) (09-13) 610-14) : 
Fig. 440. Pemphigus populi-venae \ 
Collections. As winter host on Populus angustifolia, in pocketlike leaf galls. 
Colorado: Masonville, Boulder, Longmont and Fort Collins. Utah: Hyrum. 
Fundatrices May 18 to July 4, alate fundatrigeniae June 11 to July 12; rare. 
This species is doubtfully separated from P. populi-globuli except by the 
character of the gall, located on leaf blade, not involving petiole. 
Species Not Included in Key. 
Not included on account of lack of alate viviparae and unavailability of 
type specimens. (Known only from the original description.) 
Pemphigus lasii (Cockerell) n. comb. 
Tychea lasii Cockerell (W. P.), 1903:217. Me ; , 
“Apterous Female’ (presumably viviparous). Smooth, shining, greenish yellow with 
sutures inconspjcuous, head broad and subtruncate, eye not on tubercle; legs and tip of 
rostrum dark brown; cauda light brown. Body length 2; antennal segments as follows: I 
.06, II .09, III .099, IV .036, V .115+.03, sensoria on antennal IV and V large and conspicuous. 
Hairs not evident on body or appendages. 
Collections. In ants’ nest with Lasius americanus. New Mexico: Las Vegas; 
as recorded by Mrs. W. P. Cockerell. (Data for above description taken from 
original description.) 
This form is probably the summer form of a species of Pemphigus at present 
known only ‘from the primary host. 
