228 APHIDS OF THE ROCKY MOUNTAIN REGION 
tibia, often slightly wider. Cauda blunt, parallel-sided to spoon-shaped, bearing 2 pairs of 
lateral hairs and a single dorsal preapical one. Lateral tubercles evident on prothorax and all 
abdominal segments except V and VIII. 
Ovipara. Apterous. Same as apterous summer vivipara except hind tibia somewhat 
swollen in middle and rather thickly covered with irregular-sized, nearly flat sensoria on mid- 
dle half to two-thirds. 
Male. Alate. Measurements same as alate vivipara except as figured. 
< 
Fig. 267. Moosoieen viridi- en 
Collections. On leaves and stems of Carex nebraskensis. Colorado: Fort 
Collins. Fundatrices April 26, apterous summer viviparae May 12 to Nov. 9, 
alate viviparae May 12 and 17, sexuales Nov. 9 to 23; apparently not abundant. 
Types. U.S.N.M., No. 43847. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Color of body (dark green with reddish 
at least about cornicle base), rather spoon-shaped cauda, robust cornicle 
(usually slightly wider than hind tibia), short, cylindrical cornicle, rather 
spoon-shaped cauda and length of antenna (III always at least three-quarters 
of length of unguis and always longer than cornicle, even in aptera). 
Genus Zyxaphis Knowlton 
Knowlton, 1947a:35. 
Characters. Frontal tubercles hardly developed. Antenna six-segmented, 
often with III and IV partly coalesced; secondary sensoria circular to sub- 
circular. Cornicle truncate, not longer than wide. Cauda broadly and bluntly 
triangular to semilunar, bearing rather numerous hairs. Lateral tubercles on 
abdomen prominent. Cuticula of abdomen with reticulate areas on dorsum. 
Fore wing with media twice-branched. Hind wing with media and cubitus. 
Genotype (monotypical), Zyxaphis utahensis Knowlton. 
Genotype Zyxaphis utahensis Kncewlton 
Zyxaphis utahensis Knowlton, 1947a:35. 
Alate Vivipara. (Cleared and mounted), the following parts dark: Head and thorax, 
lateral areas on abdomen, legs except middle two-thirds of tibiae, entire antenna, cornicle, 
cauda and rostral III, IV and V. Body length 1.50; across eyes .30; antenna about .60-.64, 
III and IV frequently more or less coalesced; hind tibia .50-.60; rostrum attaining 3d coxa. 
Lateral tubercles large, present on prothorax and all abdominal segments. Hairs on body 
sparse, .015 long on sides of abdomen; on antenna hardly perceptible, very sparse and .005 
long; on vertex .03. Dorsal body surface reticulated. Cornicle truncate, broader than long. 
Cauda broad, triangular to semilunar and bearing 4 pairs of lateral hairs. 
Collections. On Artemisia tridentata. Utah: Mount Carmel. Alate vivi- 
parae, May 24; rare. 
Type. Knowlton Collection. 
sen.'2-3-4" .9-} 
FO errr peal eM PIERO Ne ene iT = 
4 Gas cog * Hd, rae SS ; (ty) 
AO = Kin 
Fig. 268. Zyxaphis ata ene 
