356 APHIDS OF THE ROCKY MOUNTAIN REGION 
Alate Fundatrigenia. (Mounted in balsam), head, thorax. and appendages light brown. 
Stigma pale yellowish brown. Body length 2.2; hind tibia .9-1.05; antenna six-segmented, 
1.03-1.08; fore wing 4; rostrum as in fundatrix. Hairs pointed and sometimes curved; on III 
.03, sparse; on hind tibia .03. Wax glands present on metathorax, with diameter shorter than 
distance between glands. Hind wing with media and cubitus rising either together or apart. 
Collections. On petioles and leaves of Populus tremuloides, causing leaves 
to be bent backward at base and stunting stems so as to form a rosette; (funda- 
trix feeds on petiole and fundatrigeniae on unexposed side of leaves). Colorado: 
Canyon of South Saint Vrain (in Boulder County). Fundatrix and fundatri- 
geniae in July; very rare. 
Type. U.S.N.M., No. 50066. Paratypes, A. C. Maxson Collection. 
Asiphum sacculi Gillette 
The Aspen Leaf-pocket Aphid 
Asiphum sacculi Gillette, 1914b:65; Gillette and Palmer, 1934:217. 
Pemphiglachnus kaibabensis Knowlton, 1938a:264. 
Fundatrix. Slaty-gray with head brown; covered with fine powder; appendages brown. 
Body length 4.5-5; hind tibia .7-.8; hind tarsal II .16; antenna .60-.76; rostrum surpassing 3d 
coxa. Hairs on vertex .10; on hind tibia .06; on side of body .08-.10. 
Fundatrigenix 
SK 00009006 
Fig. 427. Asiphum sacculr 
Alate Vivipara. Head and thorax black; prothorax and abdomen olive-green, ,appearing 
blackish; antenna blackish; tibiae yellowish; fore wing slightly smoky. Body length 3-4; 
hind tibia .85-1.1; antenna .92-1; rostrum attaining 2d coxa. Hairs on vertex .05-.08; on side 
of abdomen .08-.10. 
Collections. In pseudo gall of crumpled leaves with edges turned in, on 
Populus tremuloides. Colorado: Estes Park, Manitou, Pingree Park, Skyway 
and Ward. Fundatrices June 13 to Aug. 9, alate viviparae June 13 to Aug. 20; 
not common. 
Type. U.S.N.M., No. 41930. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Character of pseudo gall, slightly smoky 
fore wing, length of hind tarsal II of fundatrigenia (slightly shorter than an- 
tennal III and equal to antennal VI) and character of hairs on antenna cf 
fundatrix (prominent, length exceeding diameter of segment bearing them). 
[Genotype Asiphum tremulae (De Geer) ] 
Aphis tremulae Linnaeus ?, 1761:261; De Geer, 1773:94. 
Aphis populi Fabricius, 1794:215 (preoccupied). 
Asiphum tremulae, Tullgren, 1909 :64. 
Fundatrix. Dark silver-gray with several more or less distinct dark crossbands. (In 
alcohol), yellow-brown with blackish brown head and sometimes somewhat lighter legs. Body 
thickly covered with relatively long and very fine hairs. Body length 5-6. Antenna five-seg- 
mented, .627; hind tibia .72; hind tarsal II .215. Hairs sparse and long on antenna. 
Funaatria 
cen 
Funda-__sen.27-11 > gen 2-4 
idiz2 
a 27 
Trigenia ee Ulli eh) (Aster Tullqren) 
Fig. 428. Asiphum tremulae 
Alate Vivipara. Fundatrigenia. Head and thorax more or less blackish brown; append-: 
ages, especially antenna distinctly paler; abdomen brownish; slightly powdery. Wax glands 
