210 APHIDS OF THE ROCKY MOUNTAIN REGION 
Egg. Newly laid, pale lemon-yellow; later, black. Size .59 by .26. 
Collections. On leaves and stems of Artemisia frigida. Throughout region. 
Apterous summer viviparae March 20 to Oct. 12, alate viviparae April 15 to 
June 2, oviparae Oct. 30 to Dec. 3, males Nov. 6 to Dec. 3; rather common but 
difficult to detect on account of protective coloration and agility in escaping. 
Type. U.S.N.M., No. 43846. Paratypes, Colo. Agr. Exp. Sta. Collection. 
This species very closely resembles P. tridentatae but differs from Wilson’s 
description in longer antenna and cauda and slender hairs. This species is found 
mingled with Epameibaphis frigidae but is easily separated by different shape 
of cornicle. 
Pseudoepameibaphis tridentatae (Wilson) 
Pseudoepameibaphis glauca Gillette and Palmer (misidentification), Knowlton and 
Smith, 1938d:220. 
Aphis tridentatae Wilson, 1915a:94. 
Pseudoepameibaphis tridentatae, Palmer, 1936b:740; Knowlton and Smith, 1938:217. 
Apterous Summer Vivipara. Pale yellowish with frosty appearance due to colorless, 
somewhat funnel-shaped hairs; all appendages pale except tarsi, tips of tibiae and of antenna 
which are dusky. Body length 1.30-1.45; antenna about .90; rostrum attaining between 2d and 
3d coxae. Cauda tapering and bearing 2 pairs of lateral hairs and a single preapical one. 
Cornicle somewhat curved outward, clavate and with flange set obliquely, held close against 
body. Hairs stout, cylindrical to somewhat funnel-shaped, on body .04-.06,; blunt to slightly 
capitate on hind tibia; blunt, minute and sparse on antenna. 
Rostrum 
: < /2-4 
Cornicle 
20 = .27 
Fig. 245. Pseudoepameibaphis tridentatae 
Alate Vivipara. Color similar to apterous vivipara. Body length 1; hind tibia .60; antenna 
about .90; otherwise as in aptera except that hairs are slightly shorter. 
Collections. On leaves and stems of Artemisia tridentata. Colorado: Eaton 
Reservoir (near Sand Creek Pass in northern Larimer County) and Cameron 
Pass (near Gould). Utah: Throughout northern part of state. Apterous vivi- 
parae Aug. 8 to 21; rare. (Alate viviparae not taken in region, described and 
figured from metatypes from Oregon.) 
Type. Granovsky Collection. 
Chief Distinguishing Characters. Character of the hairs on body (rather 
stout and funnel-shaped), short antenna (III and unguis shorter than cornicle 
in aptera, hardly longer in alata), number of sensoria (3-4) on III of alate 
vivipara and rather short hind tibia (.5-.54 in apterous, .60 in alate vivipara). 
Pseudoepameibaphis xenotrichis Knowlton and Smith 
Pseudoepameibaphis xenotrichis Knowlton and Smith, 1938d:221. 
Apterous Summer Vivipara. ‘‘Greenish, overcast with whitish due to numerous fan- 
shaped or funnel-shaped hairs.’”’ (Cleared and mounted), immaculate; even appendages en- 
tirely pale, except tarsal claws. Body length .90-1.05-“1.2”; across eyes .29-.33; antenna 
.50-.60; hind tibia .33-.40; rostrum attaining between 2d and 3d coxae. Cornicle and cauda 
typical, the latter usually hidden under abdominal VIII. 
Ab, 
- Vo 
ST OEE ORT ET PAT ee 
08-12 .07-.08 .08- .08 AO-15 j } 
Be eames ah Hd. Hd 
Body tons | Wl fap ap 27 - ,30-"34" Tib. = Ta. 
Fig. 246. Pseudoepameibaphis xenotrichis 
