HEMIPTERA OF COLORADO. 119 



Aphis cerasi Fabr. 



Fort Collins, July 16th 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 cerasifoUae Fitch. 



Rist Canon, July 19tli on under side of leaves of Prunus 

 virginiana, causing them to curl (Cowen) . 

 Aphis chenopodii Cowen n. sp. 



"Winged viviparous female: Length, not including stylo, 1.30 to l.TO mm. Alar 

 expanse 4.60 to 5.20 mm. Head, thorax, and the larger portion of the appendages black, 

 thorax green. Antennae strongly annulated, witli a few short Iiairs, 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 0.10 mm., 

 V 0.16 mm., VI 0.12 mm., VII 0.21 to 0.28 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 ot second 

 branch midway. Soigma rounded at apex but attenuate at inner end into the siibcostal. 

 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 long-^st, th>i fourth, fifth, and sixth joints subequal." 



Fort Collins and Hotchkiss, Delta County, in July, in 

 pseudogalls on Chenopodium album, formed by the Aphids 

 locating on the upper surface of the leaf, causing the edges 

 to curl together. 



Aphis eriogoni Cowen n. sp. 



"Winged viviparous female: Length of body l..")0 mm., to tip of wings 2.TU mm. Head 

 and thorax black, abdomen lighter, somewhat liairy, 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 mm., 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. Apterous individuals: Smaller individuals bright red with 

 dark eyes, larger specimens nearly black, concoloious. Sensoria on third and fourth joints 

 of the antennae (luite apparent. Abdomen with honey-comb like reticulations above and 

 below, of r,en made more prominent by a white secretion. Interspaces about 0.02 to 0.03 

 mm, in diameter. Head also finely reticulated. Some parts of the thorax reticulated. 

 The winged individuals show this reticulation, but in much less degree." 



Horsetooth ^lountain, July 24th, a good sized colony on 

 the stems and inflorescence of Eriogonum altatum. Speci- 

 mens of apparantly the same species were collected at 

 Steamboat Springs. July 13th on Eriogonum umliellatum 

 (Baker). These are somewhat smaller in size, perhaps due 

 to alcoholic preservation (Cowen) . 



