SUBFAMILY APHINAE 109 
Pterocomma pseudopopulea nN. Sp. 
The American Poplar Bark Aphid 
Pterocomma populea (Kaltenbach) (misidentification), Gillette and Palmer, 1931:928. 
Fundatrix. Silvery gray due to fine pulverulence, tinged with pinkish anteriorly and 
dusky posteriorly; rostrum mostly blackish. Body length 4; antenna 1.30. Otherwise as in 
apterous summer vivipara. 
Apterous Summer Vivipara. Yellowish olive-brown; slightly pulverulent. Body 3-4; hind 
tibia 1.2-1.8; antenna 1.2-1.7. Lateral tubercles well developed. Cornicle cylindrical, faintly 
rugose. Hairs as in alate vivipara. 
Alate Vivipara. Measurements and color same as apterous vivipara or with slightly 
longer appendages. Wings hyaline. Hairs pointed, numerous; on vertex and body .07-.09; ros- 
trum broadly obtuse, attaining abdomen. 
Ovipara. Apterous. Same as apterous vivipara except hind tibia which is very slightly 
swollen and bearing numerous small sensoria over nearly entire length. 
Male. Alate. Body length 2.2; hind tibia 1.35; antenna 1.6. Otherwise same as alate 
vivipara. 
Collections. On bark of Populus sargenti and P. nigra var. italica. Colo- 
rado: Fort Collins, Estes Park and Longmont. Utah: Smithfield Canyon, Evans, 
Hyde Park, Mount Nebo and Salt Lake City. Idaho: Twin Falls. Wyoming: 
Powell. Fundatrices April 19 to May 8, apterous viviparae May 14 to Oct. 25, 
alate viviparae May 6 to Oct. 10, oviparae Oct. 10 and Nov. 13, males Sept. 18; 
fairly common. 
Type. U.S.N.M., No. 59323. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Cylindrical shape and the length of the 
cornicle (equal to length of hind tarsal II), short unguis (1-1.5 times base of VI, 
shorter than half of III), and shortness of the hairs (.05-.07 on hind tibia). 
This species disagrees with European specimens of P. populea (Kalten- 
bach), determined by Cholodkovsky and Mimeur, in shorter hairs (the Euro- 
pean specimens measuring .10-.15 on vertex and body, .11-.14 on III, .10-.20 on 
hind tibia). Kaltenbach gave no measurements for hairs. 
‘Pterocomma salicis (Linnaeus) 
Aphis salicis Linnaeus, 1758:453. 
Melanoxanthus salicis, Buckton, 1879:21. 
Melanoxantherium salicis, Theobald, 1929:57. 
Clavigerus salicis, Gillette and Palmer, 1931:931. 
Pterocomma salicis, Baker, 1916a:283. 
Fundatrix. Color same as summer apterous vivipara. Body length 3-4; antenna 1.3-1.4, 
III .49-.50, IV .20-.25, V .21-.26, VI .14+.09-.11; cornicle .42; hind tibia 1.55; hind tarsal II 
.20. Other characters as in summer apterous vivipara. 
Apterous Summer Vivipara. Bluish to greenish black with pattern of pulverulence on 
median and intersegmental lines and lateral and dorsolateral areas; cornicle bright orange; 
legs brownish yellow with tarsi and tips of tibiae black; antenna brownish yellow, dusky 
distally. Body length 3.3-4; hind tibia 2.2-2.5; hind tarsal II .25; antenna 2-2.2, III .70-.75, 
