140 APHIDS OF THE ROCKY MOUNTAIN REGION 
This species is close to A. symphyti Schrank and appears identical with 
specimens so labelled by Hille Ris Lambers. However, Schrank says “cornicles 
very short, often black at tips only and thorax brownish” which description 
does not fit our specimens. 
Aphis gregalis Knowlton 
Aphis gregalis Knowlton, 1928a:259 and 1929a:6; Gillette and Palmer, 1932b:401. 
Fundatrix. Color similar to summer apterous vivipara. Body length 1.80-2.50; antenna 
often five-segmented. Otherwise same as summer aptera. 
Apterous Summer Vivipara. Bluish to yellowish, with head dusky and spots and broken 
dashes on dorsum of all body segments, sometimes broken or undeveloped on segments an- 
terior to abdominal IV; covered with slight powder; appendages pale with tips of segments 
dusky; cauda, anal plate and cornicle black. Body length 1.20-1.85 long; hind tibia .67; hind 
tarsal II .12; antenna .60-.85 (III and IV often coalesced), III .16-.20, IV .09-.12, V .09-.13, 
VI .10-.12+.11-.14, sensoria 0-6 on III, 0-1 on V; cornicle .10-.17; cauda .05 on median line, 
.07 on side. Lateral tubercles well developed. Rostral IV+V .13, attaining 3d coxa. Cauda 
tapering, rounded at tip, bearing 4-5 hairs on each side. 
Alate Vivipara. Head and thorax dark; abdomen yellowish to bluish green with traces 
of dusky dorsal bands especially on IV and V; cornicle dusky; cauda black. Body 1.4-1.7; 
hind tibia .75; antenna .85-.90; III .20-.25, IV .10-.15, V .10-.15, VI .10-++.13-.15, sensoria 2-7 
on III, 1-2 on IV; cornicle .12-.13; cauda .07 on median line, .12 on side. 
Ovipara. Apterous. Head dusky; body “greenish red to reddish brown; pruinose; cauda 
and cornicle black. Body elongate, length 1.40-1.70; hind tibia .41,” swollen for most of 
length and bearing numerous sensoria. 
Male. Apterous. ‘Reddish brown to dusky, head and antenna black. Body length .92- 
1.15; hind tibia .53; cornicle .07.” “Sensoria 10-23 on III, 6-17 on IV, 5-13 on V.” Otherwise 
as in apterous vivipara. 
Egg. “At first, light greenish; later, shining black. Length .70. Laid on scales and 
terminal parts of twigs.” 
Collections. On leaves and tender tips of Chrysothamnus nauseosus subspp. 
nauseosus and viscidiflorus. Throughout region. Apterous summer viviparae 
July 26 to Aug. 24, alate viviparae Aug. 6 and 7; rather common. Collections 
listed in original description of A. ornata Gillette and Palmer (1929a:5, line 4), 
from western slope of Colorado are now considered as belonging to this species. 
Cotypes. U.S.N.M., Utah Agr. Exp. Sta., Colo. Agr. Exp. Sta. and Knowlton 
Collections. 
Chief Distinguishing Characters. Pattern of broken bands and blotches on 
dorsum of apterous vivipara, slightly bent flangeless cornicle, small number of 
sensoria (2-7) on III of alate vivipara. 
Not figured on account of structural similarity to A. ornata. 
Aphis gutierreziae (Pack and Knowlton) n. comb. 
Anuraphis gutierrezis Pack and Knowlton, 1929:200. 
Apterous Summer Vivipara. ‘Yellow green, slightly pruinose’’; cornicle, cauda, anal 
plate, tips of tibiae and antennal V and VI dusky; legs pale to slightly dusky. Body length 
1.5-1.75; across eyes .38; hind tibia .52-.60; hind tarsal II .10; rostrum attaining to abdomen. 
Hairs on body and appendages very sparse and short, .015 long. 
Ovipara. Apterous. Same as vivipara except hind tibia which, though not noticeably 
swollen, bears scattered minute sensoria. 
co, [Tira Hd. Tib. x 
“09%11 Le ae 
15 ee ee 
b 
Hd. ; 
Fig. 155. Aphis gutierreziae 
Collections. On Gutierrezia sarothrae on underpart of crown or roots, 2-4 
inches deep, in colonies in crotches of the root. Utah: Honeyville, Lake Point 
and Santaquin. Apterous viviparae July 3 and Oct. 8, oviparae Oct. 8. 
Type. Knowlton Collection. Paratypes, U.S.N.M. 
