172 APHIDS OF THE ROCKY MOUNTAIN REGION 
Figure of antenna of alate vivipara drawn from specimens collected in 
Illinois and determined by Hottes. 
Aphis rumicis Linnaeus 
The Dock Aphid 
Aphis rumicis Linnaeus, 1758:451; Gillette, 1908c:178 and 180; Borner and Janisch, 
1922:65; Hille Ris Lambers, 1934:27; Jones (M.G.), 1942:167; Jacob, 1945:102, 
Aphis carbocolor Gillette, 1907:391; Gillette and Palmer, 1932b:386. 
Fundatrix. Dull slaty black throughout except proximal half of antennal III, 1st femur, 
middle portion of all tibiae and proximal portion of rostrum. Body length 1.95; antenna .90, 
III and IV coalesced; cornicle .14, Otherwise as in summer aptera. 
Apterous Summer Vivipara. Deep, dull, sooty-black throughout; appendages and ros- 
trum mostly yellowish, blackish at distal ends of segments and entire tarsi. Body length 
2.1-2.5; hind tibia 1; antenna 1.1-1.3. Dorsum of body reticulated. 
Alate Vivipara. Color same as apterous vivipara except that dorsum is polished. Body 
length 1.9; hind tibia 1; hind tarsal II .13; antenna 1.3, secondary sensoria flat; rostrum 
attaining 2d coxa. Hairs pointed, fine; on body very sparse. Cornicle cylindrical, finely im- 
bricated, and without flange. Lateral tubercles well developed on prothorax and all abdomi- 
nal segments. Cauda broadly cylindrical, with slight neck, blunt, bearing about 7 pairs of 
lateral hairs. 
Ovipara. Apterous. Color same as apterous vivipara. Body 1.9 long; antenna barely 1; 
hind tibia .83, proximal two-thirds slightly swollen and bearing about 10 small sensoria. 
Male. Apterous. Color same as females or a little lighter. Length of body 1.30; antenna 
.94; cornicle .11, 
83 
Fig. 196. Aphis rumicis 
Collections. On leaves and stems of Rumex crispus and R. sp. Throughout 
region. Fundatrices April 1 and May 27, apterous summer viviparae April 9 
to Nov. 7, alate viviparae May 2 to Sept. 5, sexuales Sept. 30 to Oct. 18; common. 
Type. Lost. Aphis carbocolor Gillette, U.S.N.M., No. 41925. Paratypes, 
Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Only slightly swollen hind tibia of the 
ovipara, relatively short thick cauda, absence of sensoria on IV of alate vivi- 
para and apterous form of the male. These characters distinguish it from A. 
fabae (A. rumicis L. of Gillette and Palmer, Horsfall and others) also found on 
Rumex sp. but wintering on Enonynius sp. Difference in reticulation on body 
mentioned by Hille Ris Lambers (op. cit.) is not apparent in our specimens. 
Aphis saliceti Kaltenbach 
The Green and Pink Willow Aphid 
Aphis saliceti Kaltenbach, 1843:103; Koch, 1854:118; Buckton, 1879:52; Gillette and 
Bragg, 1918a:89; Theobald, 1927:171; Gillette and Palmer, 1932b:440. 
Aphis salicicola Thomas, 1878:8 and 1879:212; Monell, 1879:24; Cowen (in Gillette 
and Baker), 1895:121 (misspelled ‘‘salicola’’); Gillette, 1910:403. 
Apterous Summer Vivipara. Apple-green in some, often pinkish to rust-red in other indi- 
viduals; with slight tessellation; antenna dusky, lighter on III; rostrum, cauda, anal plate and 
genital plate dusky to blackish; cornicle pale with dusky tip, legs sordid to dusky with tarsi 
and tips of tibiae black. Dorsum of body reticulated. Body length 1.6-2; hind tibia .95; an- 
tenna 1.25; cauda rather Macrosiphumlike, 
