SUBFAMILY APHINAE 307 
Egg. Newly laid, pale sordid greenish yellow; later, black. 
Collections. On leaves and tender stems of Artemisia frigida and A. bore- 
alis. Throughout region. Fundatrices May 27, apterous and alate viviparae May 
16 to Oct. 10, sexuales Sept. 27 to Nov. 1; very common. 
Chief Distinguishing Characters. Usual presence of one or two hairs on 
cornicle, short reticulated area (.08) on cornicle, length of cornicle (not exceed- 
ing antennal IV but exceeding length of cauda), number of sensoria on III 
(12-26 in apterous vivipara, 23-30 and tuberculate in alate vivipara), body color 
(dark metallic green with entire cornicle, cauda and anal plate black), and 
length of unguis (shorter than III). 
Macrosiphum frigidicola (Gillette and Palmer) 
(Plate III, 5-9) ? 
Macrosiphoniella frigidicola Gillette and Palmer, 1928:3. 
Macrosiphum frigidicola, Gillette and Palmer, 1934:180; Knowlton and Allen, 1938c:81. 
Fundatrix. Same in color as summer apterous vivipara but somewhat stouter in form and 
shorter in appendages. Size 1.6 by 1; antenna 1.6, III .45, IV .28, V .28, VI .12+-.37, sensoria 
3-4 on III; hind tibia .95. Otherwise same as summer apterous vivipara. 
Apterous Summer Vivipara. Bluish green; slightly brownish on head; powdery; cauda 
and anal plate slightly dusky; tibiae brownish yellow; cornicle dusky except at base; antenna 
dusky except base of III. Body length 1.60-1.70; across eyes .46; hind tibia 1.26-1.85; hind 
tarsal II .17; antenna 2.10-2.6; rostrum acute, tip beyond hairs needlelike, long hairs present 
on IV, attaining abdominal I. Hairs blunt or slightly capitate; on hind tibia .05-.06; on side 
of abdomen .04-.05. Cauda spatulate, rather broad, bearing 3-5 lateral pairs of hairs and 2-3 
single dorsal ones. 
ori rs 
oe o& me a 19 S20 Sen 3-76 
Viv. COL Cie aera RET! ERAT 
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Alate Viv. 60-70 (Sen. [4 = oa aan Nae aa a 
: —. * ip ee f Bot st : so 
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(Apt) Hd. a j AERTS RATASS 
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te 
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Fig. 365. Macrosiphum frigidicola 
Alate Vivipara. Head and thorax dusky; abdomen bluish green; pulverulent; antenna 
except base of III, cornicle except base, rostrum beyond base of II and entire tibiae blackish 
to black; cauda and anal plate dusky. Body length 1.86-2.3; sensoria on antenna 14-17 on III; 
rostrum attaining 3d coxa. Hairs blunt. Otherwise as in apterous vivipara except as figured. 
Ovipara. Apterous. Same as apterous summer vivipara except as follows: Body length 
2.1, width .86, more elongate; cauda broader and pinkish; proximal third of hind tibia slightly 
swollen and bearing about 16 large, flat sensoria. 
Male. Apterous. Light yellowish brown, dark on head and prothorax; cauda dusky 
brown; all other appendages dusky to blackish. Body length 1.5, width .51; hind tibia 1.2; 
antenna 2.3; cornicle .15. 
Egg. Newly laid, pale greenish yellow; later, shining black. Size .66 by .30. 
Collections. On leaves of Artemisia frigida and A. tridentata and Eurotia 
lanata. Colorado: Boulder, Idaho Springs, Bellvue, Poudre Canyon, Masonville, 
Livermore and Fort Collins. Idaho: Castleford. Fundatrix May 30, apterous 
summer viviparae June 6 to Oct. 4, alate viviparae May 27 to Sept. 19, sexuales 
Oct. 4 to 21; rather rare, scattered and difficult to observe on account of pro- 
tective coloration. 
Type. U.S.N.M., No. 41971. Paratypes, Colo. Agr. Exp. Sta. Collection. 
