SUBFAMILY APHINAE 201 
and III, rostrum, entire legs and cornicle black;-cauda and anal plate slightly dusky. Meas- 
urements same as alate vivipara except rostrum, which is attaining or surpassing 3rd coxa. 
Ovipara. Apterous. Same as apterous vivipara except as follows: Abdomen posterior to 
cornicles shining black; anal plate black; and proximal half of hind tibia swollen to twice 
the diameter of the narrowest part and bearing 20-30 rather large, flat sensoria. 
Male. Alate. Color same as alate vivipara. Body length 1.30; hind tibia .85; hind tarsal 
II .13; antenna 1.80-1.90; cornicle .28; cauda .06 on median line, .09 on side. 
Egg. Newly laid, shining straw-yellow, greenish at one end; later, brownish black. 
Tip of a3 | 7 
‘side view) } 
ERT rrr 
Fig. 232. Epameibaphis atricornis 
Collections. On leaves and stems of Artemisia longifolia and A. tridentata. 
Colorado: De Beque,. Cross Mountain and Elk Springs. Utah: Throughout the 
state. Wyoming: Chimney Rock (near Jelm). Apterous summer viviparae Apr. 
30 to Sept. 12, alate viviparae June 9 to Sept. 12, sexuales Oct. 21; rare. 
Chief Distinguishing Characters. Brown body and black appendages and 
cornicle, absence of sensoria on antenna of aptera and few sensoria (not more 
than 4) on III of alate vivipara. 
Genotype Epameibaphis frigidae (Oestlund) 
Aphis frigidae Oestlund, 1886:46 and 1887 :65. 
Epametbaphis frigidae, Gillette and Palmer, 1932b:470; Knowlton and Smith, 1936d: 
90. 
Apterous Summer Vivipara. Pale glaucous green, pulverulent and bearing numerous 
colorless capitate hairs which contribute to the frosted appearance; cauda and cornicle pale; 
appendages mostly pale, antennal VI and tip of V, tarsi and tips of tibiae black. Body length 
1-1.30; hind tibia .60-.80; antenna 1.15-1.33; sensoria 1-4 on III; rostral IV+-V, very slender 
and acute, tip needlelike in ventral aspect, attaining abdominal I. 
Alate Vivipara. Head and thorax brown; abdomen pale glaucous green; frosty in appear- 
ance due to numerous colorless or white capitate hairs; antenna, except base of III, tarsi and 
tips of tibiae blackish; cornicle and cauda pale. Same in measurements as aptera except as 
follows: Antenna 1.30-1.50, secondary sensoria circular with very narrow rims, Vertex nearly 
flat with median tuberclelike process bearing the ocellus. Hairs distinctly capitate on body, 
conspicuous, .05-.07 long and numerous; faintly capitate on legs, .03-.05 long. Cornicle cylin- 
drical, slightly curved, with flange knoblike. Cauda tapering, slightly longer than wide, bear- 
ing 3 lateral pairs of hairs, and one dorsal preapical one, often overlapped by abdominal VII 
and VIII. Lateral tubercles absent. 
late Viv ' iy 
A0-53 peers 
Fig. 233. Epameibaphis frigidae. 
Ovipara. Apterous. Head dark brown, rest of body brownish to yellowish; antenna dark, 
cornicle somewhat dusky; swollen portion of hind tibia, tarsi and tips of tibiae black. Body 
length 1.44, pointed posteriorly; antenna 1.30; hind tibia with proximal third to half swollen 
and covered with large flat sensoria. 
