124 APHIDS OF THE ROCKY MOUNTAIN REGION 
tion by Oestlund (1887:54) and by the decisions of Hottes and Frison (1931a:203) 
as well as examination of specimens sent by the latter, collected in central and 
eastern states. The original description of middletonii is not sufficiently com- 
plete for exact determination and the type specimens seem to be lost. 
Aphis asterensis Gillette and Palmer 
The Little Black-veined Aster Aphid 
Aphis asterensis Gillette and Palmer, 1929a:22 and 1932b:382. 
Apterous Summer Vivipara. Pale greenish yellow somewhat mottled; appendages and 
cornicle pale with dusky tips. Body length 1.3; hind tibia .60; hind tarsal II .09; antenna .75; 
rostrum obtuse, attaining between 2d and 3d coxae. 
Alate Vivipara. Head and thorax yellowish brown; abdomen light yellow mottled with 
pale green; antenna dusky to black; wing veins heavy and black; appendages as in apterous 
vivipara. Body length 1.4; hind tibia .70; antenna 1.1. Cauda parallel-sided distally. Cornicle 
smooth, with encircling depression next to flange. Hairs on body and appendages capitate, 
very short and sparse on antenna; one or two heavy capitate hairs near tip of cauda. 
Ovipara. Apterous. Same as apterous vivipara except hind tibia hardly swollen, bearing 
8-16 large sensoria. 
Male. Alate. Body length .90; hind tibia .55; antenna .83. 
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Fig. 131. Aphis asterensis 
Collections. On leaves and stems of Aster ericoides. Colorado: Fort Col- 
lins. Apterous summer viviparae May 8 to Oct. 5, alate viviparae May 8 to 
May 29, sexuales Oct. 5; rather rare. 
Types. U.S.N.M., No. 41464. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Peculiar shape of the cauda, with cap- 
itate hairs near tip, smooth cornicle with encircling groove at base of flange 
and large sensoria on hind tibia of ovipara. 
Aphis bakeri Cowen 
The Short-beaked Clover Aphid (Plate VI) 
Aphis bakeri Cowen (in Gillette and Baker) 1895:118 (line 20); Davis, 1908a:259; 
Gillette, 1908d:364 and 1915a:101 and 1918b:333; Smith (R.H.), 1923:1; Gillette 
and Palmer, 1932b:383; Hottes, 1949c:160 (proposed synonymy).* 
Aphis cephalicola Cowen (in Gillette and Baker), 1895:118 (line 37). 
Fundatrix. Nymph. Newly hatched, dark green or appearing black, soon streaked and 
mottled with deep red, appearing pink to naked eye; cornicle and cauda very short and pale 
yellowish green; appendages pale green. Adult. Yellowish green, usually mottled with 
salmon-pink to deep red, some individuals entirely deep dark red posterior to head. Body 2.25 
by 1.60; antenna .60-.66, III, IV and V fused; hind tibia .80. 
Apterous Summer Vivipara. Dull yellowish green to pinkish; mottled with dark green 
or rusty-brown specks; without dusky markings except on tip of abdomen, head, and areas 
surrounding bases of hairs; the latter being quite often conspicuous, especially in nymphs. 
Cornicle pale yellow and surrounded at base with pale orange blotch; appendages pale, with 
tarsi, tips of tibiae and of antenna black. Body length 1.7-2.2; hind tibia .80; hind tarsal II . 
.10; antenna .90-1.1; rostrum obtuse, slightly surpassing 2d coxa. 
Alate Vivipara. Head and thorax black; abdomen dull yellow-green to brownish; with 
dusky lateral areas and dorsal bands, which coalesce to form a dark patch. Body length 
*Hottes considers bakeri Cowen a synonym of trifol1i Oestlund. The evidence appears 
to pe writer to be inconclusive. The case is well stated by Gillette (1908d:364, foot- 
note). 
