158 APHIDS OF THE ROCKY MOUNTAIN REGION 
Aphis nyctalis Hottes and Frison 
Aphis nyctalis Hottes and Frison, 1931a:206; Palmer, 1936b:738. 
Apterous Summer Vivipara. Head and thorax dark dusky brown; abdomen yellowish 
brown with greenish tinge especially laterally with dark patch just posterior to cornicle base’; 
appendages and rostrum brown; cauda, anal plate, genital plate and cornicle black. Body 
length 1.87-2; across eyes .47; antenna 1.14-1.60; hind tibia .90-1.05; rostrum attaining 3d coxa. 
Cornicle cylindrical to broadened at base. Cauda broadly tapering to approximately parallel- 
sided, bearing 4-5 or 6 pairs of lateral hairs. Hairs on body and appendages inconspicuous. 
Alate Vivipara. ‘‘Head and thorax dark; abdomen yellowish brown to dark brown with 
lateral areas dark’’; all appendages including rostrum and also anal and genital plates black. 
Body length 2; across eyes .46; antenna 1.30; hind tibia .90-1; rostrum attaining 3d coxa. 
Otherwise as in apterous vivipara except as figured. 
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ft faeals aS 
Comicie (TEE ae) 
sen, 1-4 20-23 
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Fig. 177. Aphis nyctalis 
dite 12- oe 
Collections. On flower stalks of Senecio uintahensis and S. sp. Colorado: 
Mesa. Utah: Moab. Alate and apterous viviparae May 31 and in July; appar- 
ently rare. 
Holotype. Ill. Nat. Hist. Surv., No. 10338. Paratypes No. 10340-10357 also 
Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Dark brown body and dark appendages, 
large number of large sensoria on III and IV and a few on V in alate vivipara 
and their usual presence on III, IV and V of apterous vivipara, short bushy 
cauda, and body length (not exceeding 2). 
This species is very close to A. lugentis; indeed the limits of variation 
merge together so that further investigation may prove both to be but one 
species. 
Data for color in life were taken from the description by Hottes and 
Frison. 
Aphis oenotherae Oestlund 
The Evening Primrose Aphid 
Aphis oenotherae Oestlund, 1887:62; Gillette, 1927:344 and 346. 
Aphis oenotherae var. rufa, Gillette and Palmer, 1932b:424. 
Apterous Summer Vivipara. Mottled olive-green to dark slate color, sometimes rusty 
yellow; pale brownish on head; with powdery reticulation; cornicle and appendages pale to 
slightly dusky distally; tarsi, cauda and anal and genital plates blackish. Body length 1.5-2; 
hind tibia .95; antenna 1-1.2; rostrum attaining 3d coxa. 
rere 27 
Fig. 178. aes oenotherae 
Alate Vivipara. Head and thorax black; abdomen grass-green, olive-green or dark slate 
color occasionally rusty yellow; with powdery reticulations; with lateral areas, spot behind 
cornicle, median dashes on abdominal IV to VIII blackish; cornicle pale to slightly dusky; 
antenna, cauda and anal plate dusky to blackish; tibiae pale to brownish, except tips and tarsi 
which are black. Same in measurements as aptera except as figured. Hairs pointed, drooping 
