SUBFAMILY APHINAE 177 
Alate Vivipara. Head and thorax dark brown to blackish; abdomen medium brown with 
black lateral areas; shining; antenna, cornicle, rostrum, anal and genital plates, tarsi and tips 
of tibia black; cauda and tibiae white. Measurements as in aptera. Sensoria slightly convex; 
rostrum hardly attaining 2d coxa. Hairs on vertex, antenna and hind tibia .01-.015 long, 
pointed, fine and sparse, Cornicle slightly tapering, with indistinct flange, imbrications close 
and crenulate. Cauda slender, parallel-sided, somewhat wider at base, bearing 2 pairs of 
lateral hairs. Lateral tubercles present on prothorax and abdominal segments except V and 
VIII. Hind wing with cubitus vestigial or absent. 
A minority of individuals were found to have shorter measurements: Apterae, antenna 
1.07-1.4; III and IV often coalesced; body 1.2; alatae with these have III .25-.30 and sen- 
soria 4-8 in one collections, 8-11 in another collection. No other differences are evident. 
Ovipara. Apterous. Dark brown or brownish black. Body rather spindle-shaped poster- 
iorly. Size 1.6 by .90; antenna .94, III and IV usually coalesced; hind tibia not noticeably 
swollen and bearing about 19 sensoria, mostly in middle portion. 
Male. Apterous. Dark bronze-green. Some examples showing some rusty coloration. 
Body length .9-1.10; antenna 1-1.14. 
Egg. Newly laid, sordid yellow; later, shining black. Size .66 by .31. 
26 : "60 
20-27 
y vyy 
yr Pl ss F 
joy a 
enna rarcmarannan Sete 
SOc 4 40 30~40 G 10-11 914-17 
Fig. ‘202. Aphis setariae 
Collections. On leaves and twigs of plum (Prunus domestica) as winter 
host and Echinochloa crusgalli and wheat (Triticum vulgare) as summer hosts. 
Throughout region. Fundatrices May 7, apterous summer viviparae May 24 to 
June 11 on winter host and Aug. 10 to Oct. 25, on summer host; alate viviparae 
June 13 to July 8 on winter host, Aug. 10 to Oct. 21 on summer host; sexuales 
Oct. 3 to Nov. 7; very common. 
Cotypes. Ill. Nat. Hist. Surv. Collection, lectotype slide No. 7714, paratype 
slide No. 7715. 
Chief Distinguishing Characters. Peculiar parallel-sided cauda, white in 
color, bearing 2 pairs of hairs, vestigial to absent cubitus of hind wing, broad 
rostral IV+-V and long unguis (longer than III). 
This species has been used as genotype for the genus Hysteroneura Davis, 
the distinguishing character being the absence of cubitus in the hind wing. 
This character varies from total absence to fragmentary traces. Furthermore, 
there seems to be no generic character whereby to classify apterae. In the 
opinion of the author Hysteroneura should not be considered of generic rank. 
The peculiar cauda can hardly be used as a generic character since the same 
shape of cauda appears in A. asterensis the cornicle of which differs widely 
from that of A. setariae. 
Aphis solidaginifoliae Williams 
Aphis solidaginifoliae Williams, 1910:58; Davis, 1911b:20; Gillette and Palmer, 1932b: 
446. 
Apterous Summer Vivipara. Black to reddish or greenish brown with black dashes on 
dorsum of all segments, which are coalesced from metathorax to abdominal VII inclusive 
(visible in mounted examples); shining; legs mostly sordid yellowish; antenna somewhat 
dusky; cornicle and cauda dusky to black. Dorsum of body reticulated, Body length 1.80-2; 
elongate-oval; hind tibia .70-.75; antenna 1-1.20. Hairs slightly capitate; .03-.05 long on body 
and hind tibia. 
