HEMIPTERA OF COLORADO, 
119 
Aphis cerasi Fabr. 
Fort Collins, July 16tli on under side of leaves of Early 
Richmond Cherry, not abundant. Hotchkiss, Delta County, 
July 28th, a single individual on the same host plant (Cowen). 
Aphis cerasifoliae Fitch. 
Rist Canon, July 19th on under side of leaves of Prunus 
7 4 / 
virginiana, causing them to curl (Cowen). 
Aphis chenopodii Cowen n. sp. 
“Winged viviparous female: Length, not including style, 1.30 to 1.70 mm. Alar 
expanse 4.60 to 5.30 mm. Head, thorax, and the larger portion of the appendages black, 
thorax green. Antennae strongly annulated, with a few short liairs, third joint with 
numerous irregular sensoria, succeeding joints of conspicuously less diameter and without 
sensoria except the usual ones at tips of joints V and VI; joints III 0.30 mm., IV 0.16 mm., 
V 0.16 mm., VI 0.12 mm., VII 0.34 to 0.38 mm. A frontal elevation occurs between the 
antennae. Beak about reaching the second coxae. Thorax arched, lateral tubercle small 
or obsolete. Cubital obsolete for only a very short distance at base, the base of second 
branch midway. Scigma rounded at apex but attenuate at inner end into the subcostal. 
Honey tubes 0.12 mm., distinctly wider two-thirds of distance from base than at base. 
Style constricted towards the base, with a few long hairs, 0.14 mm. in length. Legs black 
at joints, shafts mostly lighter, hispid, with short hairs. Tarsi 0.14 mm. Apterous female: 
Length 1.60-1.80 mm. Oval and plump, green with black eyes. Antennae about 0 70 mm., 
third joint longest, the fourth, fifth, and sixth joints subequal.” 
Fort Collins and Hotchkiss, Delta County, in July, in 
psendogalls on Chenopodinin album, formed by the Aphids 
locating on the upper surface of the leaf, causing the edges 
to curl together. 
Aphis eriogoni Cotven n. sp. 
“Winged viviparous female: Length of body 1.50 rum., to tip of wings 2.70 mm. Head 
and thorax black, abdomen lighter, somewhat hairy, femora mostly black, tarsi white 
with black joints. Antennae about two-thirds the length of the body, joints III 0.40 mm., 
IV 0.20 mni., V 0.14 mm., VI 0.09 mm., VII 0.18 mm. Beak reaching third coxae. Second 
branch of cubital midway. Stigmatal vein curved uniformly. Stigma long, attenuate at 
basal end and acute at outer end. Border of abdomen nearly completely black, a sub- 
quadrangular patch of yellow on dorsum. Style short conical. Honey tubes 0.10 mm., 
long, slightly incrassate. Apierous individuals: Smaller individuals bright red with 
dark eyes, larger specimens nearly black, concoloi ous. Sensoria on third and fourth joints 
of the antennae quite apparent. Abdomen with honey-comb like reticulations above and 
below, often made more prominent by a white secretion. Interspaces about 0.02 to 0.03 
mm, in diameter. Head al.so finely reticulated. Some parts’of the thorax reticulated. 
The winged individuals show this reticulation, but in much less degree. 
Horsetooth Mountain, July 24tli, a good sized colony on 
the steins and inflorescence of Eriogonum altatuni. Speci¬ 
mens of apparantly the same species were collected at 
Steamboat Springs, July 13th on Eriogonum umbellatum 
(Baker). These are somewhat smaller in size, perhaps due 
to alcoholic preservation (Oowen). 
