SUBFAMILY APHINAE 137 
genital plates blackish. Body 1.10 by .50; hind tibia .35; antenna .50; hind tarsal II .09; 
rostrum acute, tip needlelike in ventral aspect, proximal hairs on IV longest. Hairs pointed, 
.03 long on body and appendages. Cauda tapering, rounded at tip, bearing 2 curved hairs on 
each side and 1-2 dorsal ones. Lateral tubercles well developed on prothorax and abdominal 
I and II. 
Ovipara. Color and measurements same as in vivipara except body more elongate, length 
1.20-1.50, and hind tibia, hardly swollen and bearing a few large, irregular-sized sensoria. 
Male. Apterous. Color similar to vivipara. Body length 1; hind tibia .38; antenna .60. 
Collections. On leaves and stems of Artemisia filifolia and tridentata and 
Chrysothamnus nauseosus subsp. nauseosus. Colorado: Fort Collins, Denver, 
Estes Park, Lay and Laramie-Poudre Tunnel. Utah: Brigham City and Welles- 
ville. Idaho: Evanston and McCammon. Apterous viviparae July 10 to Aug. 12, 
sexuales Oct. 8; often in large numbers. 
Types. U.S.N.M., No. 41975. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Body color and pattern of reticulation, 
sensoriation of hind tibia of ovipara and relative lengths of III, base of VI, 
unguis and cornicle (base of VI, unguis and cornicle all same length and but 
little shorter than III). 
Aphis forbesi Weed 
The Strawberry Root Aphid 
Aphis forbesi Weed, 1889c:148 and 1889b:273; Sanderson, 1900:3 (desc. of sexuales) ; 
pruith, (J.B.), 1909:24; Marcovitch, 1925:441 (life history); Gillette and Palmer, 
1932b:392. 
Apterous Summer Vivipara. Dark green, mottled with yellowish; cornicle, cauda and 
anal and genital plates yellowish to dusky; tibiae pale to slightly dusky. Body surface reticu- 
lated. Body length 1-1.2; hind tibia .50-.70; hind tarsal II .08-.09; antenna .80-.90; rostrum 
obtuse, attaining abdomen. Hairs inconspicuous, very short aS rather sparse. 
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Fig. 151. Aphis forbesi 
Alate Vivipara. Head and thorax dark; abdomen dark green, mottled with yellowish, 
with dark lateral areas and dorsal bands on abdominal VI, VII and VIII; cauda and cornicle 
yellowish to dusky; antenna dusky; legs yellowish, dusky at tips of segments. Measurements 
same as in aptera except as figured. Cauda broadly spatulate to parallel-sided, bearing 3-4 
hairs on a side. Lateral tubercles blunt, evident on prothorax, and abdominal I and VII. 
Media of fore wing with 2d fork variable from obsolete to arising at half of the distance from 
margin of wing to Ist fork. 
Collections. On roots and crown of strawberry (Fragaria sp.). Colo- 
rado: Greeley and Fort Collins. Utah: Farmington and North Salt Lake City. 
Apterous viviparae July 10 to Sept. 19, alate viviparae July 14 and Oct. 17; 
occasionally abundant. 
Chief Distinguishing Characters. Length of unguis (1.25-1.33 times jenn 
of III), number of secondary sensoria (2-4 on III of alata), short cauda (length 
on median line shorter than base of VI) and length of rostrum (attaining ab- 
domen). 
Aphis frangulae Kaltenbach 
Aphis rhamni Kaltenbach, 1843:64 (preoccupied). 
Aphis frangulae Kaltenbach, 1845:18, new name for rhamni Kaltenbach; Theobald, 
1927:202; Gillette and Palmer, 1932b: 398. 
Alate Vivipara. Dark green; cauda and anal and genital phates dusky; cornicle and 
antenna blackish; legs dusky yellow with tarsi and tips of tibiae blackish. Body length 1-1.2; 
hind tibia .63-.70; antenna .90-.95; rostrum attaining 3d coxa. 
