380 APHIDS OF THE ROCKY MOUNTAIN REGION 
PLATE VI. 
Aphis pomi. 1, fundatrix; 2, adult apterous summer vivipara; 3, alate vivipara; 
4, newborn summer vivipara; 5, alatoid nymph; 6, male; 7, ovipara. 
Aphis bakeri. 8, fundatrix; 9, adult summer apterous vivipara; 10, newborn 
summer vivipara; 11, alatoid nymph; 12, alate vivipara; 13, ovipara. 
Rhopalosiphum fitchii. 14, fundatrix; 15, adult apterous vivipara on oat; 16, 
first instar summer vivipara; 17, alate vivipara, 2nd generation on apple; 18, 
alatoid nymph; 19, ovipara and egg. 
Aphis rosea. 20, adult apterous summer vivipara; 21, first instar summer vivi- 
para; 22, alate vivipara. 
Eriosoma lanigerum. 23, adult apterous summer vivipara; 24, first instar sum- 
mer vivipara; 25, alate vivipara. 
(Figures 1-7 and 23-25 after Gillette and Taylor, 1908. Colo. Exp. Sta. Bull. No. 
133.) 
PLATE VII 
Myzus cerasi. 1, fundatrix; 2, nymph, newborn; 3, apterous summer vivipara; 
4, alate vivipara. 
Myzus persicae. 5, fundatrix; 6, nymph, newborn; 7, apterous summer vivipara; 
8, alate vivipara. 
Aphis persicae-niger. 9, apterous summer vivipara; 10, nymph, first instar; 11, 
alate vivipara. 
Phorodon humuli. 12, apterous summer vivipara; 13, alate vivipara. 
Hyalopterus arundinis. 14, fundatrix; 15, apterous summer vivipara; 16, alate 
vivipara. 
Aphis helichrysi. 17, apterous summer vivipara; 18, alate vivipara.. 
(Figures 3-11 after Gillette and Taylor, 1908. Colo. Exp. Sta. Bull. No. 133.) 
PLATE VIII 
Aphis gossypii. 1, apterous summer vivipara, dark color; 2, same, medium 
color; 3, alatoid nymph; 4, alate vivipara; 5, apterous summer vivipara, pale 
color; 6, early instar nymph, typical color; 7, same, pale color. 
Toxoptera graminum. 8, apterous summer vivipara; 9, alate vivipara. 
Macrosiphum solanifolii. 10, fundatrix; 11, alate vivipara; 12, ovipara. 
Myzus solani. 13, apterous summer vivipara; 14, alate vivipara. 
Pemphigus balsamiferae. 15, apterous summer vivipara; 16, nymph (early in- 
star); 17, alate vivipara; 18, male; 19, ovipara and egg (newly laid). (Original.) 
