328 APHIDS OF THE ROCKY MOUNTAIN REGION 
Male. Alate. Head and thorax dark brown; abdomen yellowish brown; cauda and anal 
plate pale brownish; other appendages black except lighter on base of antennal III and of 
cornicle. Body length 1.65-2.2; hind tibia 1.8; antenna 3-3.33, III .75-.80, IV .53-.65, V .50-.60, 
VI .18+.60?-.85, sensoria 48-50 on III, 9-16 on IV and 10-18 on V; cornicle .30-.45, reticula- 
tions about .10-.15; cauda .12 on median line. Otherwise as in alate vivipara. 
Collections. On leaves of Aster laevis and A. sp. Colorado: Boulder, Bell- 
vue, Poudre Canyon, Estes Park and Fort Collins. Apterous and alate summer 
viviparae July 15 and 16 and Aug. 2 and 4, sexuales Oct. 4 and 5; not common. 
On Chamaenerium angustifolium occurs a form (Nectarophora sp. Cowen— 
in Gillette and Baker—1895:124, line 30 and M. epilobii Pergande, Gillette and 
Palmer, 1934:177, misidentification) apparently, structurally inseparable from 
the above-described species. Records are as follows: Colorado: Manitou and 
Fort Collins. Apterous summer viviparae June 30 and Sept. 18, alate viviparae 
Sept. 18; rare on this host, at least. As no transfer tests were attempted the 
status of this form is not proven. 
Type. U.S.N.M., No. 49288. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Character. Long, slender hind tarsal II and base of 
antennal VI (longer than rostral IV-+V), long cauda with slender tip and bear- 
ing about 13-16 hairs, apple-green body with pale cauda and anal plate and 
blackish cornicle and appendages, length of rostral IV-+-V (.14-.15), absence of 
sensoria on IV and fewer than 40 on III in alate vivipara, fewer than 20 in 
aptera, length of unguis (not shorter than III or than cornicle), length of cor- 
nicle and character of reticulation and alate condition of male. 
Macrosiphum thermopsaphis Knowlton 
Macrosiphum thermosaphis Knowlton, 1938a:15. 
Apterous Vivipara. ‘‘Green; pruniose.” (Cleared and mounted on slide), body immac- 
ulate; antenna beyond middle of III, distal end of cornicle, tips of tibiae and of rostrum and 
entire tarsi black; cauda pale. Body length 3.50-5; across eyes .60-.70; antenna about 6; hind 
tibia 3-4-‘'4.40”; rostrum attaining between 2d and 3d coxae. Cauda rather broad, irregular 
parallel-sided to tapering, bearing 6-8 pairs of lateral and dorsolateral hairs and 1-2 single 
dorsal preapical ones: Hairs on body slightly capitate, marginal ones .05. 
= a+ sen, G- 20 
Ee 
PEW OAAS AM CUA Eee SW eet PEAY YS CECT S CUE ors Or ELE IL Cees. 
70-115 18 -.30 1.10 ~ 
1.65 
te 6 aes 
Fig. 393. Macrosiphum thermopsaphis 
Alate Vivipara. Color same as apterous vivipara or with darker portions more pro- 
nounced. Body length 2.90-‘‘3.25"; across eyes .55-‘.66"; antenna 5.2-‘6.20"; hind tibia 
*2.73’’-3-‘'3.84” ; otherwise same as apterous vivipara except as figured. 
Collections. On leaves and stems of Thermopsis montana. Colorado: Eldora 
Lake, Custer County and Pingree Park. Apterous viviparae June 24 to Aug. 24, 
alate viviparae and alate males Aug. 23; not common. 
Type. U.S.N.M. Paratypes, Utah and Colo. Agr. Exp. Sta. and Knowlton 
Collections. . 
