150 APHIDS OF THE ROCKY MOUNTAIN REGION 
asclepiadis Passerini (1863:25). However, Passerini’s name (if applied to this 
species which undoubtedly belongs to the genus Aphis) is preoccupied by A. 
asclepiadis Fitch (1851:65), a different species. 
Aphis maculatae Oestlund 
The Spotted Poplar Aphid 
Aphis maculatae Oestlund, 1887:61; Gillette and Palmer, 1932b:412. 
Aphis populifoliae Fitch (misidentification), Davis, 1910d:489; Patch, 1913a:82, 
Aphis davisi Patch, 1917:418. 
Chaitophoroides populifoliae (Fitch), Knowlton, 1929c:36. 
Apterous Summer Vivipara. Brownish black, lighter brown on head, with conspicuous 
patches of white powder on lateral areas and broken dorsal bands; cornicle, anal plate, genital 
plate and cauda black; appendages pale with dusky tips; rostrum dusky beyond middle of II; 
tarsi black. Body length 2.76; hind tibia 1.6; antenna 2; cauda tapering, rather slender. 
Alate Vivipara. Head and thorax black; abdomen blackish brown; with pulverulent 
spots as follows: Lateral areas anterior to cornicle and a dorsal pair on abdominal I, IV, VII 
and VIII; cornicle and cauda black; antenna dusky throughout; tibiae pale with blackish 
tips; tarsi black. Body length 1.77; hind tibia 1.1; antenna 1.66, sensoria in irregular double 
row; rostrum attaining between 2d and 3d coxae.* Hairs nearly erect, numerous, somewhat 
resembling those in Chaitophorus. Cauda bearing 8-10 pairs of hairs. Lateral tubercles de- 
veloped. Young. Light rusty brown, mostly covered with powder with only middorsum of 
abdominal II and III naked. Alateid Nymph. Similar to apterous vivipara except meso- and 
metathorax gray. 
Apt, e ge ae 
. ce 
Viv—— 000°%9 go O OQo0 00 
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os 
Pee Wa had 
eV mrad rial) 
Fig. 167. Aphis maculatae 
Ovipara. Apterous. Reddish brown; covered with heavy flocculence; cornicle and cauda 
dusky; hind tibia dusky brown; Ist and 2d tibiae pale with dusky tips; tarsi dusky. Body 
length 2.50; antenna 1; hind tibia .90; cornicle .27. 
Male. Alate. Body length 1.40-2; antenna 1.60; hind tibia 1.10; cornicle .20. 
Egg. Newly laid; amber brown; later, black; covered with slight powder. 
Collections. On twigs and leaves of Populus acuminata, P. angustifolia, P. 
nigra var. italica, P. sargenti and P. tremuloides as summer hosts; Cornus 
stolonifera as winter host. Colorado: Fort Collins, Estes Park, Delta and 
Meeker. Utah: Paradise, Saint George, Providence, City Creek Canyon, the 
Upper American Fork Canyon, Birch Canyon, Big Cottonwood Canyon, Immi- 
gration Canyon and Smithfield Cenyon and Tooele. Idaho: Immigration Can- 
yon, Mink Creek and Circleville. Apterous summer viviparae June 4 to Sept. 
*These measurements seem considerably longer than those in the original description 
but agree with specimens received from Minnesota, collected by Hottes and compared 
with types in cooperation with Oestlund. 
