SUBFAMILY APHINAE 127 
Aphis cardui Linnaeus 
The Thistle Aphid 
Aphis cardui Linnaeus, 1758:452; Kaltenbach, 1843:115; Baker, 1920b:17; Smith 
(R.H.), 1924 (circ.); Gillette and Palmer, 1932b:387. 
Brachycaudus cardui, van der Goot, 1915:254. 
Anuraphis cardui, Theobald, 1927 :233. 
Apterous Summer Vivipara. Green or yellowish with large dorsal patch and bands, 
sometimes entire dorsum black; legs yellowish with tarsi and tips of tibiae black; antenna 
yellowish with tips of segments dusky; cornicle black. Body length 2-2.3; hind tibia 1; an- 
tenna 1.40-1.75. 
Se ae 24 12 
Fig. 135. Aphis cardui 
Alate Vivipara. Color same as in apterous vivipara except antenna dark. Body length 
2; hind tibia 1-1.20; hind tarsal II .13; antenna 1.7-1.9, secondary sensoria round, flat; rostrum 
attaining 3d coxa. Cornicle cylindrical to tapering, very faintly imbricated, nearly smooth, 
with slight flange. Cauda tapering, broader than long, bearing 3 hairs on each side. Hairs 
fine, pointed, very sparse and short; on antenna .02, hardly as long as half of diameter of III; 
on hind tibia .04 long, length equalling diameter of tibia; on body .02; on vertex .03. Lateral 
tubercles present on prothorax and abdominal segments. 
Male. Alate. Body length 1.5; cornicle .15; otherwise as in alate vivipara except as 
figured. 
Collections. On leaves and stems of plum (Prunus sp.) as winter host; 
thistle (Cirsium lanceolatum) as summer host. Colorado: Bellvue, Fort Collins, 
Grand Mesa, Virginia Dale (near Livermore) and Battle Creek. Idaho: Napa 
and Twin Falls. Utah: Generally distributed. Apterous summer viviparae June 
1 to Aug. 28 on Cirsium, alate viviparae June 13 to 23 on thistle, Aug. 15 and 
Sept. 17 to Oct. 15 on plum, alate males Oct. 27; rare, especially on eastern 
slope of Rocky Mountains. 
Chief Distinguishing Characters. Short cauda, long cornicle (.22-.28 or .32, 
twice as long as hind tarsal II), extraordinarily long rostral IV+V (.18-.20) 
and black body of alate vivipara due to bands and dorsal patch. 
Aphis ceanothi Clarke 
The Ceanothus Aphid 
Aphis ceanothi Clarke, 1903:250; Essig, 1917:338 (synonymy); Gillette and Palmer, 
1932b:388. 
Aphis ceanothi-hirsuti Essig, 1911c¢:525; Gillette and Palmer, 1932b:389. 
Apterous Summer Vivipara. Large Form. Reddish brown, marked with black posterior 
to cornicles; legs mostly pale; antenna dusky except paler on proximal portion of III; cauda 
and cornicle black. Body length 1.8-2; hind tibia .9; antenna 1.3; rostrum obtuse, IV+V .11 
long, attaining 3d coxa. Cornicle in some views slightly curved outwards. Cauda about as 
long as broad, bearing 3-4 hairs on each side. Lateral tubercles conspicuous on prothorax 
and abdominal I, not evident on other segments. Small Form. Body length 1-1.40; width .90; 
hind tibia .50-.70; hind tarsal II .11; antenna 1-1.1. Dorsal surface of body somewhat reticu- 
lated. ' 
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Fig. 136. Aphis ceanothi 
