432 APHIDS OF THE ROCKY MOUNTAIN REGION 
Collections. On Gutierrezia sp. Throughout region. Alate viviparae April 
25 and June 26, apterous viviparae April 25 to Oct. 11. 
Type. U.S.N.M. Paratypes, Colo. Agr. Exp. Sta. and Knowlton Collections. 
This species differs from allied species in the presence of sensoria on IV in 
alate and occasionally in apterous vivipara and few hairs (2 lateral pairs) on 
cauda. 
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sen'25-36 42-44 Sen. 9-12 "365 wre sen. ae) 
i—=——4 C repartee 
J-2  "474.55-259' 
Fig. 398. Macrosiphum zerogutierreziae 
Macrosiphum zerohypsi (Knowton and Allen) n. comb. 
Mucrotrichaphis zerohypsi Knowlton and Allen, 1940:34. 
Apterous Summer Vivipara. (Cleared and mounted), head brownish; abdomen colorless 
with dark areas at bases of lateral and dorsolateral hairs, dorsal ones more or less faint; an- 
tenna beyond proximal portion of III, knees, tarsi and distal half of tibiae black; cornicle, 
cauda, anal plate and rostrum dusky. Body length 1.7-2; across eyes .38-.46; antenna about 2, 
III .55-.63, IV .38-.42, V .36-.40, VI .14-.17-++.40-.47, sensoria 1-5 on III; hind tibia 1.10-1.20; 
hind tarsal II ‘.12’’-.14-.16; cornicle .43-.50, reticulated area .03-.05; cauda on median line .26, 
on side .32; rostrum needlelike in ventral aspect, IV+V .14-.16, attaining 3d coxa. Hairs 
pointed; on vertex .04; on III .04, slightly exceeding diameter of segment; on abdomen .05, 
not very numerous; 3-4 on cornicle, .05-.06 long. 
Collections. On Artemisia tridentata. Utah: Dry Canyon (one mile south). 
Apterous summer viviparae April 8; rare. 
Type and Paratypes. Knowlton Collection. 
Chief Distinguising Characters. Short area of reticulation on cornicle 
(not over .05-.07), hairs on abdomen not numerous and short unguis (shorter 
than .50) and shallow frontal tubercles. 
Not figured on account of close resemblance to zerothermum and flavilum 
which are figured. 
Macrosiphum zerothermum Knowlton and Allen 
Macrosiphum zerothermus Knowlton and Allen, 1938c:83 and 1940:33. 
Mucrotrichaphis toti Knowlton and Allen, 1940:33 (new synonymy). 
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"T1723 45 -~ “42 "40 - 4?" 
Fig. 399. Macrosiphum zerothermum 
Apterous Summer Vivipara. (Cleared and mounted), head dark; abdomen colorless with 
dark areas at dorsal and lateral hair bases; antenna, except proximal half of III, tibiae on 
distal half, cornicle, cauda, anal plate, and rostrum dark. Body length 1.5-2; across eyes 
.88-.45; antenna 2.1-2.6; hind tibia 1.08-1.30; rostrum attaining 3d coxa. Hairs on body num- 
erous. 
