144 APHIDS OF THE ROCKY MOUNTAIN REGION 
Collections. On leaves and stems of celery (Apium graveolens), Cicuta 
douglasi, Conium maculatum, carrot (Daucus carota), Heracleum lanatum, 
and parsnip (Pastinaca sativa). Throughout region. Apterous summer vivi- 
parae May 18 to Oct. 6, alate viviparae May .10 to Oct. 11; common. 
Neotype. (Selected by the writer). U.S.N.M. 
This species appears to be structurally inseparable from A. helianthi unless 
a tendency to darker green color and usually longer antenna can be considered 
significant; but the range of shorter measurements overlap with the range of 
variation of helianthi so no line of distinction can be drawn. However, since 
no satisfactory host transfer tests have been accomplished the two forms are 
here retained as distinct. 
Not figured on account of similarity to A. helianthi Monell. 
Aphis hermistonii Wilson 
Aphis hermistonii Wilson, 1915a:93; Gillette and Palmer, 1928:11 and 14 and 1932b: 
406. 
Apterous Summer Vivipara. Green with white powdery markings; cornicle black; cauda 
and anal and genital plates dusky to black; tarsi and tips of appendages and rostrum blackish. 
Body length 1.35; hind tibia .40-.50; hind tarsal II .10; antenna .85-.95; cauda .03 on median 
line, .68 on side; rostrum with needlelike tip in ventral aspect, IV+V .15 long, attaining ab- 
dominal I. Hairs pointed, fine, erect, sparse, .03 on vertex, antenna and hind tibia. Cauda 
tapering, short, .03-.05 long on median line and blunt, shorter than hind tarsal II, bearing 3 
curved hairs on each side. Lateral tubercles developed on prothorax and abdominal I and 
VII. 
Alate Vivipara. Same as aptera except as figured and the following: Hind tibia .50-.60; 
rostrum attaining 3d coxa. Secondary sensoria flat with narrow margins. 
3 
Cot 5 Lda Cpt 
Ae ae : 
, COILS St ete 
typical 12-200 
waeeevire 
20 -27335 
. 
Fig. 158. Aphis hermistonii 
Collections. On leaves and tender twigs of Artemisia tridentata, A. filifolia 
and Chrysothamnus nauseosus subsp. nauseosus. Colorado: Eckert, Craig, 
Redfeather, Steamboat Springs, Cherokee Park and Lay. Utah: Logan, Eden, 
Fish Lake and Duchesne. Apterous summer viviparae June 17 to Sept. 4, alate 
viviparae June 26 to Aug. 8; not abundant. 
Cotypes. Granovsky Collection. 
See discussion under A. canae (p. 125) or Gillette and Palmer (1928:14). 
Aphis incognita (Hottes and Frison) 
Aphis symphoricarpi Thomas (misidentification), Oestlund, 1887 :50. 
Cedoaphis incognita Hottes and Frison, 1931a:438. 
Aphis incognita, Gillette and Palmer, 1932b:407. 
Fundatrix. Pale green with head and dorsal bands and lateral areas on all segments 
dusky, bands on abdominal III, IV and V more or less coalesced; antenna and cornicle, 
distal half of rostrum, cauda and anal and genital plates blackish. Body 2.15-2.37 by 1.37-1.40, 
reticulated; antenna .80-.88, III and IV sometimes coalesced; hind tibia .70. 
Apterous Summer Vivipara. Head dusky brownish, rest of body yellowish green; ap- 
pendages pale with dusky tips; cornicle dusky but yellowish at base and surrounded by yel- 
lowish area. Cauda, anal and genital plates slightly dusky. Body 2-3 by 1.4-1.6; hind tibia 1; 
hind tarsal II .14; antenna 1.4-1.5, sensoria strongly tuberculate. 
Alate Vivipara. Head and thorax black; abdomen yellowish green, with dark lateral 
spots anterior to cornicle and dark bands on abdominal VI, VII, and VIII; antenna, cornicle, 
cauda and legs blackish. Body length 1.66; hind tibia 1.9; antenna 1.3-1.5; rostrum attaining 
between 2d and 3d coxae. Antennal segments heavy, wider than hind tibia. Hairs on antenna 
