SUBFAMILY APHINAE 159 
to nearly erect. Cauda elongated, nearly parallel-sided with slight neck, bearing 3 lateral and 
3 dorsolateral hairs on each side. Lateral tubercles present. 
Male. Alate. (Cleared and mounted on slide), head and thorax black; abdomen with 
lateral areas, spot posterior to base of each cornicle and short dorsal bands on all segments, 
especially posteriorly, dusky; antenna, cornicle and cauda blackish; legs blackish with most 
of tibiae brownish. Body length 1.50; antenna 1.20, III .22-.33, IV .18-.23, V .14-.21, VI .09- 
.12+.22-.29, sensoria thickly covering III, IV and V and usually a few on base of VI; cornicle 
.10. 
Collections. On leaves and stems of Epilobium angustifolia and Oenothera 
strigosa and O. caespitosa, not curling leaves. Throughout regicn. Apterous 
and alate viviparae May 22 to Oct. 6, alate males Aug. 25 and Oct. 18; very 
common. Often found mingled with Aphis oestlundi. 
Chief Distinguishing Characters. Numb2r and presence of sensoria on III, 
IV and V of alate vivipara, bushy cauda with 5-6 pairs of lateral hairs and 
rather long erect tibial hairs (slightly exceeding diameter of tibia). 
Cotypes. Univ. of Minn. Collection. Type of variety rufa Gillette, U.S.N.M., 
No. 41968; paratypes, Colo. Agr. Exp. Sta. Collection. 
This aphid resembles very closely A. epilobii Kaltenbach but Gillette (op. 
cit.) after examination of mutilated specimens from Germany determined as 
the latter species still considered Oestlund’s species as distinct. Specimens 
determined by Hille Ris Lambers as A. epilobii Kaltenbach seem identi¢al with 
the Colorado form. Theobald’s description (1927:111) appears to fit reasonably 
well though he reports presence of oviparae on Epilobium which have not 
been found here and do not fit in with the idea of these host plants as summer 
hosts only. Further study may prove A. oenotherae to be a synonym of A. 
epilobii Kaltenbach. 
Aphis oestlundi Gillette 
Aphis oenotherae Oestlund (misidentification), Oestlund, 1922:130. 
Aphis ean Gillette, 1927:345; Hottes and Frison, 1931a: 208; Gillette and Palmer, 
1932b:42 
Apterous Summer Vivipara. Light green; tarsi, tips of antenna, of tibiae and of cornicle 
dusky to blackish; cauda and anal plate pale to slightly dusky. Body length 1.8-2; antenna 
.80 (often five-segmented), rostrum attaining 3d coxa or abdomen. 
Ce) 
> , SHE 
Fig. 179. Aphis oestlundi 
Alate Vivipara. Head and thorax black; abdomen light green; with dusky lateral areas, 
spot at base of each cornicle posteriorly and sometimes traces of median dashes on abdomen; 
antenna and cornicle dusky; legs pale except tips of tibiae and tarsi which are black; cauda 
pale. Length of body 1.1-1.7; hind tibia .60; antenna .80-1. Hairs pointed, fine, sparse, droop- 
ing. Cauda somewhat elongated and constricted near base, bearing 2-3 hairs on each side. 
Lateral tubercles well developed on prothorax, and abdominal I and VII. 
Collections. On leaves and stems of Oenothera strigosa. Colorado: Fort 
Collins, Boulder, Rocky Ford and Greeley. Idaho: Parma and Hansen. Utah: 
La Verkin. Apterous summer viviparae May 19 to July 22, alate viviparae May 
29 to Sept. 10; very rare in this region, but abundant in occasional infestations. 
Type. U.S.N.M., No. 41967. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Number of sensoria\in alate vivipara (not 
more than 6 on III and none on IV and V), length of eased} IV+V (.11-.15 and 
attaining abdomen), number of hairs on the cauda (2-3 lateral pairs) and light 
grass-green body. 
