208 APHIDS OF THE ROCKY MOUNTAIN REGION 
Ovipara. Apterous. (Mounted in balsam), all appendages and cauda and anal and genital 
plates dusky; otherwise same as apterous vivipara except hind tibia, the proximal third of 
which is distinctly swollen and bearing scattered sensoria. 
Male. Alate. (Mounted in balsam), all appendages dark to black. Body length 1; across 
eyes .33-.36; antenna 1.70, III, IV and V bearing numerous sensoria; hind tibia .60-.85; other- 
wise as in aptera. 
C 
oO d%ce ¢ AN 7 z ud #8 Apt. Hd. Tib. 
(i? ie 00.20 0 — A Ta AN Wituecense 7 
.60 : 
Fig. 241. Microsiphum oregonensis 
Collections. On leaves and stems of Artemisia tridentata. Utah: Throughout 
state. Colorado: Gunnison. Idaho: Castle Ford and Riverdale. Apterous vivi- 
parae June 26 to Oct. 10, sexuales Oct. 11; rather rare. 
Chief Distinguishing Characters. Infundibulate hairs on vertex and body, 
rather short length of antenna especially unguis and length of rostral IV+V 
(shorter than .14). 
[Genotype Microsiphum ptarmicae Cholodkovsky] 
Microsiphum ptarmicae Cholodkovsky, 1908:687. 
Apterous Summer Vivipara. (Mounted in balsam), somewhat dusky; head, prothorax, 
cornicle, cauda, anal plate, rostrum, and appendages dark. Body length 2-2.2; across eyes 
-44-.48; across in front of eyes .35-.39; antenna 2.20-2.45; hind tibia 1.25-1.35; rostrum attain- 
ing 3d coxa. Cornicle cylindrical or narrower at base than at tip, without flange; cauda taper- 
ing and bearing about 6 hairs on each side; anal plate with median protuberance. 
4 camer asd a cA Man 
45-48 Sen. 6-12 
Cer TG STII TERS 
i= ES 75-85 Hd. 
Hd.Tib. _ 73. ENS 3 a 
Fig. 242. Microsiphum ptarmicae 
Host. Achillea ptarmica. (Not taken in region.) 
Type. Zool. Inst., Leningrade.. Metatypes, Colo. Agr. Exp. Sta. Collection. 
Above description and drawings made from 4 metatype specimens. 
Genus Pseudoepameibaphis Gillette and Palmer 
Gillette and Palmer, 1932a:145 and 1932b:477. 
Characters. Vertex nearly flat; frontal tubercles absent. Ocular tubercle 
rudimentary. Secondary sensoria circular. Hairs blunt to funnel- or fan-shaped. 
Cornicle slender, slightly swollen distally on inner side, impinged against abdo- 
men, and with thin-edged flange set obliquely. Cauda tapering. Lateral tuber- 
cles not evident. Wing venation as in genus Aphis. This genus differs from 
Epameibaphis Oestlund only in the shape of the cornicle. 
Genotype (monotypical), Pseuwdoepameibaphis glauca Gillette and Palmer. 
Key to Species of Pseudoepameibaphis 
Ly eUneuis twice as long as cormicien (perc 09) eeeeeen see terre ene erro ee gts eee glauca 
inguts shorter than twice as long asecommic lens sess ee 2 
2. Cornicle not longer than .17, not longer than twice hind tarsal II (p. 209)..................-. eSsigi 
Cornicle longer than .17, 2-4 times as long as hind tarsal Tl................. eee 3 
32) Unguis at least .75.t1mes, lenethvof conniclen( ps2: 0) ete ee cere tridentatae 
Unguis shorter than -75 times, length of cormmic]eycssc ee ee ee 4 
