274 | | APHIDS OF THE ROCKY MOUNTAIN REGION 
1.20-1.50; rostrum attaining nearly to 2d coxa. Hairs very slightly capitate on vertex, body, 
antenna and hind tibia. Ocular tubercle small. Lateral tubercles absent. 
Ovipara. Apterous. Reddish yellow or pinkish cinnamon mottled with light yellow aa 
_ marked with green on narrow dorsolateral dashes on intersegmental lines and on lateral areas; 
appendages pale with tarsi, tips. of tibiae, cauda, cornicle and base of antennal VI ‘dusky.. 
Body length 1.40-1.70; antenna .80, III partly coalesced with IV; hind tibia moderately 
swollen over most of length and bearing somewhat scattered rather large sensoria. Otherwise 
as in apterous summer vivipara. 
Male. Alate. Head and thorax brown; abdomen yellow-clay with green markings on 
- lateral areas on IV to VIII and with rusty brown dorsal patch on III, IV and V and paler 
. bands on V and VI; legs brownish; antenna black. Body length 1.50 to 1.70; antenna 1.48, 
III, IV and V bearing numerous rather large sensoria. 
Collections. On underside of leaves of Xanthium orientale as summer host. 
and Hippophae rhamnoides as winter host. Throughout region.. Apterous 
summer viviparae June 29 to Nov. 2 and alate viviparae June 22 to Sept. 29 on 
summer host, males on both hosts Aug. 21 to Oct. 5, oviparae on winter host 
Oct. 5; common. 
Cotypes. Univ. of Minn. Collection. 
This species is very similar to C. shepherdiae with which it is associated — 
on the winter host but differs as follows: Longer unguis (longer than III and 
exceeding 3 times length of base of VI while in shepherdiae unguis is shorter 
than III and shorter than 3 times base of VI), longer cornicle (not shorter than 
40 in alate or .68 in apterous vivipara) and more acute cauda with constricted 
tip. ; 
Capitophorus xerozoous Knowlton and Smith 
Capitophorus xerozoous Knowlton and Smith, 1936c:112. 
Apterous Summer Vivipara. ‘Green’; (Mounted on slide), body immaculate; antenna 
beyond proximal two-thirds of III and cornicle beyond proximal half dusky; tarsi, tips of 
tibiae and of rostrum black; cauda and anal plate pale. Body length 1.7-2.5; across eyes. 
.45-.50; antenna 3; hind tibia .90-1.12; rostrum attaining 2d coxa. Inconspicuous dorsal 
tubercles present on abdomen, one row on either side of median line. Hairs on body infundibu- 
late and sessile, rather numerous. 
Apt. 
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Fig. 330. Capitophorus xerozoous 
es 
Collections. On leaves of Chrysothamnus nauseosus subsp. nauseosus, C. 
greeni, C. wyomingensis, C. parryi and C. sp. Utah: Milford, Fillmore, 
Logan Canyon, Uinta and Tremonton. Idaho: Stone. Apterous viviparae May 6 
to Sept. 23; apparently rare. 
Type. C. F. Smith Collection. Paratypes, U.S.N.M., Knowlton and Colo. 
Agr. Exp. Sta. Collections. 
This species is very similar to C. gregarius but differs as follows: Shorter 
cornicle (not longer than the base of VI), color of cornicle (not black), length 
of IV (distinctly shorter than III instead of about equal) and green body in- 
stead of brown. 
Capitophorus zoomontanus Knowlton and Smith 
Capitophorus zoomontanus Knowlton and Smith, 1936e :234. 
Apterous Summer Vivipara. ‘‘Grayish green.” (Mounted on slide), body immaculate with 
cornicle, cauda and appendages pale, except tarsi, tips of tibiae, of rostrum and of antenna 
which are dusky. Body length 1.5-2-‘‘2.30”; across eyes .50-.55; antenna 3.08-4; hind tibia 
1.40-1.75; rostrum attaining between 2d and 3d coxae. Hairs funnel-shaped, nearly sessile, on 
vertex and body;.on antennal I and II slightly globate and minute; on III blunt, minute and 
