294 APHIDS OF THE ROCKY MOUNTAIN REGION 
Chief Distinguishing Characters. Glaucous green body with cauda not dis- 
tinctly black, relatively short cornicle (ranging shorter than antennal V, though 
limits overlap, but longer than cauda) and only slightly broader at base, number 
of sensoria on III of apterous vivipara (not more than 10), moderately long 
acute rostral IV+V (.15-.17 and reaching abdomen), long reticulated area of 
cornicle (.25 or about two-fifths of length of cornicle), length of many-haired 
cauda (not shorter than cornicle) and length of antennal segments. 
Fig. 348. Macrosiphum artemisivulgaris 
Macrosiphum atripes Gillette and Palmer 
The Dark Red Aster and Goldenrod Aphid 
Macrosiphum atripes Gillette and Palmer, 1933:359 and 1934:173. 
Apterous Summer Vivipara. Dark reddish brown to blackish red with dusky hair bases; 
cauda pale; cornicle and antenna black throughout; legs black except bases of femora; rostrum 
black distally; wings hyaline, veins slender. Body length 1.85-3; across eyes .56; hind tibia 
1.60-i.80; hind tarsal II .13-.14; antenna 2.54-3. Cauda slender and tapering, with slight neck 
and acute tip, bearing 6-8 lateral and 3 dorsolateral hairs on each side and a single dorsal 
preapical one. Rostrum attaining abdominal I or II. Hairs on side of abdomen .03-.04. 
Alate Vivipara. Head and thorax black; abdomen dark reddish brown to blackish red; 
cauda pale; cornicle, appendages and rostrum, especially III and IV+V, black. Measure- 
ments same as in apterous vivipara except rostrum attaining to 3d coxa or abdominal I and 
hairs .03 on body, 
Ovipara. Apterous. Color same as in apterous summer vivipara. Body length 2.20-3; 
across eyes .44-.49; antenna 2.8-3.5, III .68-.90, IV .45-.60, V .40-.50, VI .12-.15-+-.65-.82, sensoria 
17-22 on III; hind tibia 1.5-1.8, very slightly swollen for half of its length and bearing scat- 
tered sensoria on three-fourths of length; cornicle and cauda same as in apterous vivipara. 
Male. Alate. Same as alate vivipara except the following: Cornicle .45, reticulated area 
.11; cauda .15 on median line, .20 on side and sensoria on antenna present and numerous on 
III, IV and V. 
2-20 So am 25 
15-16 
Fig. 349, Macrosiphum atripes 
Collections. On leaves and stems of Aster sp., Kuhnia eupatoroides and 
Solidago missouriensis. Colorado: Masonville and Stove Prairie Hill (west of 
Bellvue). Alate and apterous viviparae June 16 to Sept. 13, sexuales Oct. 12 to 
25; rarely collected but very abundant at times on Aster, deforming stems. 
Type. U.S.N.M., No. 49291. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Rather long reticulated area on cornicle 
(longer than third of cornicle), color of cornicle, rostrum and tibiae in aptera 
