162 APHIDS OF THE ROCKY MOUNTAIN REGION 
convex but not tuberculate. Hairs pointed and fairly numerous to sparse, semierect; on tibia 
.03-.04. Cornicle cylindrical, coarsely imbricated and with flange. Cauda tapering, acute, with 
but slight tendency to constriction near base, bearing three hairs on each side. Lateral tu- 
bercles large on prothorax and abdominal I and VII. Anal plate slightly produced on ventral 
margin. 
Fig. 182. Aphis pentstemonicola 
Male. Apterous. Very dark olive-green; all appendages dark dusky brown to black. Body 
length 1.1; hind tibia .40; antenna .70. 
Ovipara. Apterous. Brownish yellow, shading to dusky brown on head; abdomen mottled 
with dusky green; antenna dusky, darker distally; cornicle and cauda dusky; legs sordid white 
with tarsi and tips of tibiae and femora dusky to blackish. Body length 1.40, hind tibia .40-.50; 
antenna .80; cauda .10; hind tibia slightly swollen on proximal half and bearing about 6 large 
scattered sensoria. 
Collections. On leaves and stems of Penstemon sp. Colorado: Fort Collins. 
Utah: Logan. Fundatrix Apr. 23, apterous summer viviparae May 4 to Oct. 20, 
alate viviparae May 1 to Oct. 20, males Oct. 19 and 20, oviparae Oct. 12 to 20; 
rather common. 
Type. U.S.N.M., No. 41465. Paratypes, Colo. Agr. Exp. Sta. Collection. 
This species is very close to A. pentstemonis Williams, but differs from 
cotypes of the latter, which were examined, as follows: Presence of rather 
numerous s2nsoria on IV and V in both alate and apterous viviparae (absent 
in pentstemonis except a few in a few specimens), shape of cauda which is less 
constricted, number of caudal hairs, only 3 on each side. 
Aphis persicae-niger Smith 
The Black Peach Aphid (Plate VII) 
Aphis persicae-niger Smith (E.F.), 1890:101; Smith (J.B.), 1890, Bul. 72; Gillette, 
1908d:308; Cutright, 1925:193 (life history) ; Gillette and Palmer, 1932b :430. 
Early Spring Apterous Vivipara. Same as summer vivipara except as follows: antenna 
1.10-1.25; unguis .17-.22, hardly more than half of III; hind tibia .80; cornicle .20. 
Prothoracic 
Tubercle 
3 Apt. Viv. Hd. Gag Vertex Vertex 
~ VV. 
EC Apt. on 
Fig. 183. Aphis persicae-niger 
Alate Vivipara. Body length 1.60-1.80; hind tibia 1.10; hind tarsal II .12; antenna 1.60- 
1.75, secondary sensoria tuberculate; rostrum attaining between 2d and 3d coxae. 
Apterous Summer Vivipara. Young. Newborn pale or lemon-yellow; in 2d instar salmon 
or amber color, later, dark yellowish brown, becoming black only in adult instar. Adult. Shin- 
