92 APHIDS OF THE ROCKY MOUNTAIN REGION 
As described by the last four authors this species possesses the essential 
characters ascribed to this genus, as shown in accompanying figure. Several 
apecies seem to be confused under this name. 
Habbitat. On leaves of Populus sp. and Salix sp. Not recorded from region.) 
Chaitophorus populifoliae Davis 
The Clear-winged Aspen Aphid 
Chaitophorus populifoliae (Fitch) (misidentification), Oestlund, 1887:38. 
Chaitophorus populifoliae Oestlund, Davis, 1910d:489; Gillette and Palmer, 1931:918. 
Alate Vivipara. Head and thorax black; abdomen pale green, with blackish bands; wings 
hyaline. Body length 2-2.20; hind tibia .60-.70; antenna about 1.25-1.5, sensoria circular, irreg- 
ularly arranged on III; cornicle .09 long. Hairs on antenna rather short, .03-.05 long; on hind 
tibia .05-.06, slightly longer than diameter of tibia; on vertex .05-.09; on body .05-.07; cauda 
knobbed, anal plate sinuate. Rostral IV+V .09-.10, attaining 2d coxa. 
Apterous Summer Vivipara. Same as alate vivipara except body color mottled with dark 
green and unguis generally shorter than III, but sometimes equal.* Hairs spinelike; on body 
.03-.09; on hind tibia semierect, .05-.09 (diameter of tibia .04). 
Ovipara. Apterous. Body length 1.8-2.0; otherwise as in apterous vivipara except hind 
tibia which is .58 long and moderately swollen and bearing numerous sensoria along almost 
entire length. 
Male. Apterous. Body length 1.2-1.4; otherwise as in alate vivipara except that antenna 
bears numerous small sensoria on III, IV and V. 
aaa ace a) 
Fig. 100. Chaitophorus cece 
Collections. On leaves and twigs of Populus tremuloides and P. acuminata 
and Quercus gunnisoni. Colorado: Throughout the state. Utah: Mount Timpan- 
ogos and Mount Carmel. Apterous summer viviparae June 13 to Oct. 2, alate 
viviparae June 22 to Sept. 25, sexuales Oct. 2; rather common. 
Cotypes. Univ. of Minn. Collection. 
Chief Distinguishing Characters. Number of secondary sensoria (9 - 17) and 
their irregular arrangement on III of the alate vivipara, dark dorsal bands on 
the abdomen of the alate vivipara only and the absence of the green circle on 
abdomen of both alate and apterous forms, and short rostral IV-+V (.09-.10). 
The latter character distinguishes this species from C. populeti Panzer and C. 
populi-albae Boyer de Fonscolombe as determined by Hille Ris Lambers. 
Chaitophorus viminalis Monell 
The Little Black and Green Willow Leaf Aphid 
Chaitophorus viminalis Monell, 1879:31, Hottes and Frison, 1931a:165; Gillette and 
Palmer, 1931:919. 
Chaitophorus nigrae Oestlund, 1887 :40. 
Fundatrix. Light yellowish green, darker on head and thorax and lighter posteriorly; 
antenna, rostrum and legs pale with tips blackish. Body and appendages hairy. Body length 
1.86; antenna six-segmented, 1,14, III .17, IV .08, V .07, VI .07-+-.07; hind tibia .50. 
Apterous Summer Vivipara. Light gteen, brown, yellow or colorless with 4 green spots, 
often with a pair of green longitudinal stripes or broad black vittae extending to sides of body, 
cornicle pale surrounded by pale area; legs pale with tips of tarsi black. Body length 1.5-2; 
surface somewhat denticulate; antenna .90-1.2; rostrum attaining between 2d and 3d coxae. 
Hairs simple, on body some spinelike .05-.08 long, others fine .03 long; on vertex .08-.10, 
spinelike; on antenna rather fine, spinelike, .06 long; on hind tibia fine, erect, .08 (diameter 
of tibia .04). 
Alate Vivipara. Head and’ thorax black; abdomen green with black lateral areas and 
bands on all abdominal segments; head and thorax black; wings hyaline. Measurements same 
*Two collections were taken Aug. 12 and 20 at Pingree Park and Black Mesa, Colo., 
in which the specimens had unguis never shorter, usually longer than III and sensoria 
6-10 in a row on III in alate vivipara. These resemble Chaitophorus essigi Gillette 
and Palmer excepting in the dark bands of the alate vivipara. 
