SUBFAMILY APHINAE 175 
also shorter. There is considerable resemblance to A. sambucaria Passerini as 
described by Theobald (1927:149), but length of the cauda is much less than 
half that of cornicle, the proportion given by Theobald for Passerini’s species. 
Aphis senecio-radicis (Gillette and Palmer) 
Anuraphis senecio-radicis Gillette and Palmer, 1929a:9 and 1932b:442. 
Aphis senecio-radicis, Gillette and Palmer, 1932b:442. 
Apterous Summer Vivipara. Dusky blue-green, shading to brownish on head, and with 
dark bands on terminal segments; slightly pulverulent; cornicle, cauda, anal and genital plates 
black; appendages dusky to blackish throughout. Body 2.80 by 1.70; hind tibia .90-1.05; sec- 
ondary sensoria variable in size. Rostrum hairy, attaining abdominal I or II. 
_ Alate Vivipara. Head and thorax black; abdomen bluish green, dusky on lateral areas of 
all segments and dashes on dorsum of abdominal VII and VIII; appendages, cornicle and 
cauda dusky to black throughout. Body length 2.2; hind tibia, cauda and antenna as in 
aptera: secondary sensoria not tuberculate. Hairs fine, pointed, moderately numerous and 
erect, .04-.05 long on body, antenna and hind tibia. Cornicle imbricated, cylindrical, without 
evident flange. Cauda obtusely tapering with only a very slight constriction, bearing 7 hairs 
on each side. Lateral tubercles present on all segments anterior to cornicles, but hardly evi- 
dent posteriorly. Media of fore wing with 2d fork variable, sometimes absent. 
Ovipara. Apterous. Same as apterous vivipara except hind tibia which is slightly swollen 
distally to middle and bearing 10-24 sensoria. 
Male. Apterous. Body length 1.20; hind tibia .70; antenna .90, III and IV more or less 
coalesced. 
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Collections. On roots of Senecio spartioides and S. sp. Colorado: Salida, 
Grand Mesa, Colorado Springs, Battle Creek (northern Routt County), Fort 
Collins foothills and Virginia Dale. Idaho: Hansen. Apterous summer vivi- 
parae July 25 to Oct., alate viviparae Aug. 16 to Sept. 21, sexuales Oct. 30; 
rather common. 
Types. U.S.N.M., No. 41457. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Absence of dorsal markings on apterous 
summer vivipara, length of unguis (not shorter than III, usually longer), length 
of cornicle (shorter than hind tarsal II); length of rostrum (IV+V .20 and at- 
taining abdominal I or II), hairs erect, numerous and rather long (length 
equaling diameter of III) and slender hind tibia of ovipara, bearing few sen- 
soria. 
Aphis sensoriata Gillette and Bragg 
Aphis sensoriata Gillette and Bragg, 1918b:330; Gillette and Palmer, 1932b:443. 
Fundatrix. Rusty red to chestnut-brown; cornicle pale and with pale area about base; 
legs, cauda at tip and antenna, except most of III, dusky. Color resembles that of the bud 
scales at the bases of which they feed. Size 2-2.50 by 1.50-1.75; antenna .65, III, IV and V 
coalesced; hind tibia .70; cornicle .10. Young. Born from fundatrix, pale greenish with head 
brownish; appendages colorless with grayish tips of segments and tarsi. 
Apterous Summer Vivipara. Appearing black or blackish with cornicle pale greenish 
yellow to blackish; but in alcohol, green with transverse blackish markings on dorsum of 
