SUBFAMILY APHINAE 167 
Aphis ribiensis Gillette and Palmer 
A elu fa oe Gillette and Palmer, 1929a:20 and 1932b:435; Allen and Knowlton, 
3126. 
Fundatrix. Pale to medium yellowish green or apple-green; cornicle and cauda nearly 
colorless; tibiae pale to slightly dusky at tips; antenna pale with dusky tip. Body 1.90-1.10; 
hind tibia .55; antenna .54, III and IV coalesced; cauda .14 on side. Otherwise as in summer 
aptera. 
Alate Vivipara. Alatoid Nymph. Head slightly dusky; thorax very pale yellow; abdomen 
yellowish green, some individuals with distinct mottling; cornicle colorless; wing-pads black. 
Adult. Head and thorax black; abdomen yellowish green; rostrum and antenna dusky, lighter 
on proximal part of III; tibiae pale yellowish with tips black; cornicle pale; cauda pale to 
slightly dusky; anal and genital plates dusky. Body length 1.90; hind tibia .85; hind tarsal II 
.10; antenna .95; rostrum obtuse, hardly attaining 2d coxa. Hairs pointed, drooping; on hind 
tibia moderately numerous. Cauda elongate, blunt and with slight neck and bearing 2-3 pairs 
of lateral hairs. Lateral tubercles present. 
ae % 2 ssa ; aman R Fund, 
Fig. 189. erty: ribiensis 
Apterous Vivipara. Same color as fundatrix; measurements same as alata except as fol- 
lows: Body length 2-2.14. Hairs on body .04, very sparse. 
Ovipara. Apterous. Color same as summer aptera. Body length 1.55; hind tibia .40; 
antenna .55; hind tibia moderately swollen and bearing about 20 large sensoria scattered over 
proximal two-thirds of length. 
Male. Alate. Head and thorax black; abdomen dusky dark green; antenna black or 
blackish throughout; cornicle and cauda dusky; tibiae pale with tips black. Body length 
1.33; hind tibia .65; antenna .85. 
Egg. Newly-laid, greenish yellow; later, shining black. 
Collections. On leaves and stems of Ribes aureum and R. inerme, curling 
leaves. Colorado: Fort Collins and Pingree Park. Utah: Mount Tinipanogos, 
Richmond, West Point and Willard. Fundatrix May 26, apterous summer vivi- 
parae May 26 to July 24, alate viviparae May 31 and Aug. 25 to Nov. 9, sexuales 
Oct. 11 to Nov. 9; not abundant. Apparently leaving Ribes early, perhaps for 
summer host, and appearing again on the Ribes in the fall. 
Type. U.S.N.M., No. 41463. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Numb2r of sensoria (8-20) on III of alate 
vivipara, length of cornicle (.10-.15 long) in alate vivipzra, number of hairs (3 
pairs) on cauda, size of body (1.9-2.14 long) and pale cornicle. 
From A. nasturtii this species seems to show no distinguishing characters; 
however, since no host transfer tests have been dene the two species will be 
held distinct for the present. 
Aphis ribi-gillettei Allen dnd Knowlton 
Aphis ribi-gillettei Allen and Knowlton, 1939:128. 
Apterous Summer Vivipara. Light green; cornicle and cauda pale; tips of appendages 
dusky. Body length .90-1.30; hind tibia .56-.60-‘..69"’; tarsal II .08; antenna .71-.80; rostrum 
attaining abdomen. 
Alate Vivipara. Pale green; antenna and tips of tibiae blackish; cauda, anal and genital 
plates and cornicle pale to slightly dusky. Body length .90-1.50; hind tibia .50-.70; hind tarsal 
II .07; antenna .70-.94; rostrum attaining 3d coxa. 
