164 APHIDS OF THE ROCKY MOUNTAIN REGION 
Aphis pilosicauda Gillette and Palmer 
Aphis pilosicauda Gillette and Palmer, 1932a:141 and 1932b:432. 
Alate Vivipara. Head and thorax black; abdomen olive-green; lateral areas dusky; 
cauda, cornicle and antenna dusky to black; legs dusky. Body length 1.5-1.9; hind tibia .65-.80; 
hind tarsal II .11; antenna .80-1.05, secondary sensoria flat; rostrum obtuse, IV+V rather 
slender, attaining abdominal I. 
Apterous Summer Vivipara. Olive-green; slightly powdery; cornicle dusky to blackish; 
tibiae yellow with tips black; tarsi black; antenna pale with terminal segments dusky. Dorsal 
surface of body reticulated. Same in measurements as alata except as figured and rostrum 
attaining abdominal I or II, Hairs pointed, fine, sparse. Cornicle cylindrical, rather slender, 
about as wide as hind tibia, imbricated and with flange. Cauda blunt, tapering to cylindrical, 
slightly longer than wide, bearing about 8 hairs on each side. Lateral tubercles present on 
prothorax and abdominal I and VII. 
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Fig. 185. Aphis pilosicauda 
Ovipara. Apterous. Color same as apterous vivipara except color of hind tibia which is 
brownish. Body length 1.80; hind tibia .53-.60; antenna .80, III and IV nearly coalesced; 
hind tibia very slightly swollen in middle and bearing about 1-4 hardly visible sensoria. 
Male. Apterous. Color same as in apterous vivipara. Body length 1.20; hind tibia .53; 
antenna .70-.75, III and IV sometimes coalesced; cornicle .15; rostral IV-+V.12 long, attaining 
middle of abdomen. 
Collections. On stems of Cirsium sp., near ground or on roots. Colorado: 
Fort Collins and Boulder. Apterous summer viviparae June 19 to Sept. 18, 
alate viviparae June 11 to July 18, oviparae Oct. 4 to 30, males Oct. 30; not 
abundant. 
Type. U.S.N.M., No. 43845. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Short, bluntly tapering bushy cauda, 
rather short antenna (hardly longer than 1), few sensoria (6-7) on III of alate 
vivipara, length of unguis (longer than III) and dark green body, without 
dorsal patch. 
Aphis pomi DeGeer 
The Apple Aphid (Plate VI) 
Aphis pomi De Geer, 1773:53; Gillette, 1908d:303; Gillette and Taylor, 1908:23; Baker 
and Turner, 1916c:955; Matheson, 1919:686; Patch, 1923a:45 and 1929:698; Theo- 
bald, 1927:133; Gillette and Palmer, 1932b:433. 
Aphis mali Fabricius, 1794:216; Smith (J.B.), 1900:3. 
Fundatrix. Young. Newly hatched, very dark green; cornicle very short, shorter than 
antennal I and black. Body length .60, antenna .28. Adult. Yellowish apple-green, head dusky 
brown; tip of antenna, cornicle, cauda, anal plate, genital plate, tip of rostrum, tarsi and tips 
of tibiae black to blackish; remainder of appendages slightly dusky. Body length 1.50; antenna 
.75, III and V coalesced. Otherwise as in summer apterous vivipara. 
Alate Vivipara, Head and thorax black; abdomen light yellowish green or apple-green, 
rarely lemon-yellow; with darker green spots laterally but not true dusky areas; cauda, and 
appendages pale or slightly dusky; tarsi, tips of tibiae and of antennal III, IV and V and 
entire VI, cornicle, cauda and anal and genital plates blackish. Body length 1.50-1.90; hind 
tibia 1; antenna 1.15-1.30; rostrum obtuse, attaining between 2d and 3d coxae. 
Apterous Vivipara. Young. First instar, very pale yellowish green. Adult. Same as alate 
vivipara except as follows: Head, thorax and lateral abdomen yellowish green. Hairs pointed, 
drooping; .04 long on body and .02 on antennal III; on hind tibia, length equalling or slightly 
exceeding diameter of tibia. Cauda elongated-cylindrical, with only slight tendency to con- 
striction near base and blunt at tip, bearing 4 lateral and 3 dorsolateral hairs on each side 
and a median preapical pair near tip. Lateral tubercles present on prothorax and all abdominal 
segments except VIII. 
