128 APHIDS OF THE ROCKY MOUNTAIN REGION 
Alate Vivipara. Body length 1.2-1.5; hind tibia .70; hind tarsal II .11; antenna 1.1, 
sensoria convex, with narrow margins, arranged in double row on III; rostrum obtuse, attain- 
ing abdomen. Lateral tubercles quite large on prothorax, abdominal I and VII and, in some 
examples, evident on all abdominal segments. 
Collections. On flower stems and leaves of Ceanothus sp. Colorado: 
Boulder and Pingree Park. Apterous viviparae (small form) July 11 to Sept. 2, 
(large) Aug. 25, alate viviparae July 11; rather rare. 
This small form differs slightly from the original description in the length 
of III (not attaining 31) and the width of the aptera (not attaining 1.19). 
Essig, after examining both forms of Colorado specimens which were sent him, 
states in correspondence that they check very well with the California speci- 
mens, which he considers to belong to Clarke’s species. This gives the species 
a very wide range of variation. 
Cotypes. Essig Collection. Cotypes of ceanothi-hirsuti, Essig and Colo. 
Agr. Exp. Sta. Collections. 
Chief Distinguishing Characters. Reddish or amber-brown body with black 
markings on posterior abdominal segments, length of cornicle (ranging about 
the same or slightly longer than III), length of rostral IV+V (about the same 
as that of hind tarsal II, tapering shape of the cauda which is hardly longer 
than broad and shorter on median line than hind tarsal II, number of caudal 
hairs (3-4 lateral pairs) and number of sensoria on III of alate vivipara (11-16), 
in small form. No alatae of larger form were taken but sensoria in specimens 
this size ranged from 19-23 as described by Essig (1911¢:525). 
Aphis cerasifoliae Fitch 
The Chokecherry Aphid 
Aphis cerasifoliae Fitch, 1855:131; Thomas, 1879:93; Patch, 1914a:260; Swain, 1919:97; 
Gillette and Palmer, 1932b:389. 
Fundatrix. Color same as summer aptera but lacking the pulverulence. Body length 
2.25-2.90; antenna .90-1, five-segmented (III and IV fused). 
Apterous Summer Vivipara. Pale yellowish to light green, with darker green markings 
on intersegmental lines and on median line anterior to cornicles; dorsum lightly covered with 
powder in transverse bars; venter heavily powdered; tibiae pale with tips blackish; antenna 
dusky distally; cornicle pale except tip, cauda pale. Body 2.5 by 1.4; hind tibia 1.1-1.2; 
antenna 1.66; rostrum broad, attaining 2d coxa. 
Fig. 137. Aphis cerasifoliae 
Alate Vivipara. Color as in apterous vivipara except head and thorax which are brown- 
ish black and cornicle and antenna, beyond base of III, which are dusky. Body length 2-2.5; 
hind tibia .90-1; antenna 1.35-1.70; rostrum attaining between 2d and 3d coxae. Hairs pointed, 
inconspicuous, sparse; on hind tibia very drooping. Cauda bearing 2-3 hairs on each side. 
Lateral tubercles evident on prothorax and all abdominal segments. Fore wing with 2d fork 
of media unusually short, about one-quarter of the distance from margin of wing to 1st fork. 
Ovipara. Apterous. Light yellow mottled with green; head, antenna beyond base of III, 
tarsi, tips of 1st and 2d tibia, entire hind tibia and tip of cornicle dusky. Body elongated in 
shape, 1.80 long; antenna .80; hind tibia strongly swollen on nearly entire length and thickly 
covered with large, flat sensoria. 
