322 APHIDS OF THE ROCKY MOUNTAIN REGION 
Chief Distinguishing Characters. Rather numerous sensoria on III (in 
_ aptera 12-23, in alata 42-58) and black head, thorax, antenna, cornicle and 
rostral IV+-V. 
This species is recorded by Linnaeus, Theobald and Patch as having a pink 
variety but this has not been noted in Rocky Mountain collections. 
Macrosiphum rudbeckiae (Fitch) 
The Coneflower or Goldenglow Aphid 
Aphis rudbeckiae Fitch, 1851:66. 
Macrosiphum rudbeckiae, Essig, 1911a:400; Soliman, 1927:124; Hottes and Frison, 
1931a:320; Gillette and Palmer, 1934:193. 
Fundatrix. First Instar. Dull brick-red with dusky or brownish on head and abdomen; 
cornicle and appendages brown to dusky. Adult. Body length 2.50; hind tibia 2; antenna 2.5, 
III .70-.75, IV .49-.50, V .46-.50, VI .17+.45-.51, sensoria 8 on III; cornicle .50, reticulated 
area .12; cauda .43 on median line, .50 on side. Otherwise as in apterous summer vivipara. 
Apterous Summer Vivipara. Blood-red; shining; hair bases without dark areas in adult 
but present in young; cauda and anal plate pale reddish; tibiae brownish yellow with tips 
black; rostral III and IV+-V and tarsi black; cornicle yellow-brown on ‘proximal half, dusky 
to black on distal half; antenna dusky to black beyond base of III. Body length 3.7-4.5; across 
eyes .60; hind tibia 2.8-2.9; antenna 4.5; rostrum attaining 3d coxa. Hairs blunt; on side of 
abdomen .05-.07. Cauda tapering, acute and with slight neck, bearing about 8 hairs on each 
side and 3-6 dorsal ones. 
Alate Vivipara. Head and thorax red (slightly brownish in cleared specimen) ; abdomen 
blood-red; shining; antenna beyond base of III, cornicle beyond proximal third, tibiae, espe- 
cially ‘distal half, rostral III and IV+V and entire tarsi black; cauda and anal plate pale 
reddish. Body length 3-3.70. Hairs blunt; on side of abdomen .03-.04. Otherwise as in ap- 
terous vivipara. 
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Fig. 385. Macrosiphum rudbeckiae 
Ovipara. Apterous. Same as apterous summer vivipara or somewhat smaller; cauda 
about .40 on median line. Proximal fourth to third of hind tibia slightly swollen and covered 
with numerous sensoria. 
Male. Alate. Yellowish red, including head and thorax; antenna beyond II, cornicle, 
tibiae, tarsi and rostral III, and IV+V black or blackish; cauda pale. Body length 2-2.50; 
hind tibia 1.85-2; antenna about 4; sensoria numerous on III, few and scattered on IV and V; 
cornicle .39 with reticulated area .10; cauda .25 on median line. 
Collections. On stems of Rudbeckia laciniata and R. hirta. Throughout re- 
gion. Fundatrices May 11 to May 24; apterous and alate summer viviparae June 
10 to Sept. 24, sexuales Sept. 17 to Nov. 9; very common, in large colonies, in- 
jurious and unsightly. 
Cotypes. U.S.N.M. 
Chief Distinguishing Characters. Brick-red to blood-red body, with yellow 
legs in aptera and pale cornicle bases, numerous sensoria on III in viviparae, 
rather long reticulated area on cornicle, length of cornicle (not exceeding V), 
long cauda (over two-thirds of cornicle), numerous hairs on cauda, long rostral 
IV-+-V and hind tarsal II and sensoria on hind tibia of ovipara not extending as 
far as half of length of tibia. 
~ Macrosiphum rudbeckiarum (Cockerell) 
Cockerell’s Green Goldenglow Aphid 
Nectarophora rudbeckiarum Cockerell, 1903a:168. 
Macrosiphum rudbeckiarum, Hottes, 1949:47 (misidentification). 
