SUBFAMILY APHINAE 303 
Macrosiphum eoessigi Knowlton 
The Red Hollyhock Aphid 
Macrosiphum eoessigi Knowlton, 1947e:137. 
Fundatrix. Same as early summer apterous vivipara. 
Apterous Summer Vivipara. ‘‘Reddish brown to maroon-red, occasionally with slight 
greenish cast.” (Mounted on slide), cornicle and appendages except base of antennal III 
black; rostrum, cauda, anal plate and genital plate dusky to blackish; dorsal hair bases sur- 
rounded by blackish areas ‘which may coalesce to form a broken band on dorsum of segment 
preceding cauda; usually with dark lateral areas posterior to cornicle.”’ Body length 2-3.5; 
across eyes .55; antenna 3.32-‘'4.19"; hind tibia 1.8-2.35-‘'2.8; rostrum attaining 3d coxa. 
Cauda slender, tapering or with slight neck, bearing 4-8 hairs on each side and one or two 
dorsal preapical ones. 
Alate Vivipara. Head and thorax black; otherwise color same as apterous vivipara. Body 
length 2-2.8-‘3.1"’; across eyes .50; antenna 3.5-‘‘4’’; hind tibia 2.15-‘‘2.50”; rostrum attaining 
3d coxa. 
Ovipara. Apterous. Color and measurements same as in apterous vivipara except as fol- 
lows: Body length 2.3-2.5; antenna about 2.56-3.10; hind tibia 1.6-1.85-“1.91,”’ bearing small 
scattered sensoria on proximal half which is blackish. Cauda tapering or with slight con- 
striction, bearing 4-7 hairs on each side and one preapical one. 
Male. Apterous. Body length ‘1.67”-2; antenna 2.42-3; hind tibia 1.43-1.77; cornicle 
**.39”’-.53 with reticulated area .06-.08; cauda .19-.25 long. 
791" 
16-19 
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65-70 SEN. 1-8 cc cg nathvede 99 -1.03-").21 
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Fig. 360. Macrosiphum eoessigi 
Collections. On hollyhock (Althea rosea). Throughout Utah, Wyoming 
and Idaho. Fundatrices May 1, summer viviparae May 1 to Oct. 16, alate vivi- 
parae May 13 and 25, sexuales Sept. 9 to Oct. 16; very abundant and in‘urious, 
at times, especially in spring and fall. 
Type. Knowlton Collection. Paratypes, U.S.N.M. and Utah and Colo. Agr. 
Exp. Sta., Essig, C. F. Smith, and A. N. Tissot Collections. 
Chief Distinguishing Characters. Small number of sensoria on III of alate 
vivipara and on the hind tibia of ovipara, well develcped dusky areas about 
the bases of the dorsal hairs, intensely black appendages and dusky cauda and 
anal plate, reddish brown body, length of cornicle (not longer than 1.1), length 
of reticulated area on cornicle (one-fourth of length of cornicle) and length of 
rostral IV+V (.17-.18). 
