134 APHIDS OF THE ROCKY MOUNTAIN REGION 
Ovipara. Dusky olive-green to brownish; antenna, beyond III, tips of tibiae, cornicle 
and cauda dusky. Body length 1.77; hind tibia .65-.80; antenna .87; cauda .12. 
Male. Alate. Body length 1.50; hind tibia .73; antenna .95. 
Alate =Apt 
Fig. 146. Bee debilicornis 
Collections. On curled leaves and stems of Helianthus annuus and 
H. tuberosus. Colorado: Fort Collins, Colorado Springs and Loveland. Utah: 
Clarkston. Apterous summer viviparae July 2 to Sept. 26, alate viviparae July 
5 to Sept. 24, males Aug. 31 to Sept. 29, oviparae Sept. 17 to 29; not common in 
region, but apparently widely distributed as specimens have been received 
from Iowa, Minnesota, Kansas and New Jersey. 
Type. U.S.N.M., No. 41458. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Slender, weak, flangeless cornicle, taper- 
ing cauda, numerous tuberculate sensoria on III and IV of alate vivipara and 
usual presence of sensoria on III and IV of apterous vivipara. These characters 
separate this form from A. helianthi with which it hasdeen confused. 
Aphis eriogoni Cowen 
Aphis eicgons Cowen (in Gillette and Baker), 1895:119; Gillette and Palmer, 1932b: 
396, 
Apterous Summer Vivipara. Black or brownish black with pattern of white reticulation 
covering all of dorsum except median portions of abdominal II and III, entire dorsum of V, 
and dorsolateral areas on mesonotum; antenna beyond middle of III, tarsi, tips of tibiae, en- 
tire cornicle, cauda, anal plate and rostral III, IV and V dusky. Body length 1.65-2; hind 
tibia .60-1.1; antenna .8-1.1; cauda bearing 2-4 hairs on each side and one preapical one; 
rostrum slender, Adiednrs he 2d-3d coxa. 
4 Co Pe. 
23 (% BS) 
a : = Co. 
od a As Ba09e Pie : Roa aaa ee 20 
Viv .30-.40 .20 ot 09 ~.12 (ny eed 
“Apt. CV. Ad, Uecntued Alate Viv 10-12 ; 
Fig. 147. Aphis eriogoni 
1? BT ESE Pesan naraianned “= 
Alate Vivipara. Head and thorax blackish brown; abdomen yellowish olive-green mot- 
tled with olive-yellow, with dark bands on abdominal VI, VII and VIII and dark lateral 
areas on all segments; cornicle, antenna except base of III, tarsi and tips of tibiae black; 
terminal segments of rostrum dusky; cauda yellowish to slightly dusky; anal plate black. 
Body length 1.25-1.50; cauda tapering, acute, with 2-3 hairs on each side. Other measurements 
as in apterous vivipara. Lateral tubercles evident on prothorax, and abdominal I and VII. 
Hairs pointed, .03-.05 long, drooping to semierect on hind tibia. 
Collections. On leaves and stems of Eriogonum alatum, E. inflatum, E. 
bakeri, E. effusum, E. flavum, E. subalpinum and E. umbellatum. Colorado: 
Fort Collins, Boulder, Eldora, Clifton, Elkhorn, Steamboat Springs, Estes Park, 
