122 APHIDS OF THE ROCKY MOUNTAIN REGION 
spicuous. Rostral IV-+V slender and bearing sparse, short hairs. Hairs on body and antenna 
short and sparse; on hind tibia .02-.04 long. 
Alate Vivipara. Head and thorax black; abdomen brown with slight dusky dashes. 
Body length 1.50-1.90; across eyes .34; hind tibia .70; antenna 1.2. Otherwise as in apterous 
vivipara. 
Ovipara. Apterous. Same as apterous vivipara except hind tibia dark in color, con- 
siderably swollen and thickly covered with irregular-sized, mostly large, sensoria. 
Male. Alate. Head and thorax black; abdomen brown, with lateral areas dark; antenna 
except base of III, cornicle, cauda, anal plate, rostrum, tarsi and tips of tibiae black. Body 
length 1.1; across eyes .35; hind tibia .60; antenna 1-1.50; otherwise same as alate vivipara 
except as shown in figure. 
Apt. Sen.2-6 Sen, 0-3 
‘ IRC MPN INTIS STAND SM NOIDAAU OPS AO AO eg 
25~— 38 Serea-i2 16-2) Gel4=,18, 09m 2 ; (09512 
Se 
me rey 
+0 1 PHA 
Heaney, Beal 
So 2 
3-15 
69-7) 
Fig. 128. Aphis agathona 
Collections. On leaves of Eriogonum inflatum and E. corymbosum and sp. 
Colorado: Gateway, Fort Collins and Clifton. Apterous vivipara May 31 to 
Oct. 19, alate viviparae May 31 to July 21, sexuales Oct. 19. 
Type. U.S.N.M. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Brown body, short unguis (shorter than 
17), short cauda (shorter than broad) and length of rostral IV+V (.13-.15) 
and its slender shape. 
Aphis argentinae-radicis Gillette and Palmer 
Aphis argentinae-radicis Gillette and Palmer, 1932a:140 and 1932b:380. 
Apterous Summer Vivipara. Nymph. Pale, dusky only on head and tips of appendage 
segments. Adult. Pale greenish with mottling of darker green; head, terminal abdominal 
segments and speckles over dorsum dusky; cornicle, anal plate, cauda and entire legs blackish. 
Body length 1.40-1.70; hind tibia .90; hind tarsal II .12; antenna .75-1.05, sensoria circular 
with rather broad rims, strongly convex and set on tubercles; rostrum obtuse, slender attain- 
ing abdomen. Hairs fine, pointed, erect, numerous, .04-.05 on body. Dorsal surface finely - 
denticulate but not showing reticulate pattern. Cornicle tapering, 1.5 times as wide at base 
as at tip, imbrications finely denticulate, flange rather large. Lateral tubercles present. 
Ovipara. Apterous. Body length 1.50; hind tibia .63; antenna .68; hind tibia bearing 
about 2 sensoria near middle, not noticeably swollen. Otherwise as in apterous vivipara. 
Fig. 129. Aphis argentinae-radicis 
Collections. On roots of Potentilla anserina. Colorado: Pingree Park. 
Apterous summer viviparae and one apterous ovipara Aug. 23; rare. 
Types. U.S.N.M., No. 43844. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Prominent erect hairs, denticulate sculp- 
ture of cornicle, very short cauda bearing not more than 3 pairs of hairs and 
the slender hind tibia of the ovipara bearing only about 2 noticeable sensoria. 
