SUBFAMILY APHINAE 247 
Cotypes. U.S.N.M., No. 56 and Univ. of Neb. Collection, No. 53. 
The Rocky Mountain examples differ from the type specimens in that they 
fall in the lower range of variation in sensoria and somewhat below the meas- 
urements for the antenna in the aptera but the measurements of the alata agree 
with the description. — 
Genus Bipersona Hottes 
Hottes, 1926:115; Gillette and Palmer, 1934:143. 
Characters. Vertex distinctly convex; frontal tubercles well developed and 
diverging, exceeding vertex. Antenna six-segmented; secondary sensoria cir- 
cular. Cornicle cylindrical, reticulated. Cauda with broad proximal portion and 
with portion beyond body slender, crenated, appearing as though twisted; anal 
plate produced ventroposteriorly, resembling a cauda. Hairs pointed. Lateral 
tubercles present. Fore wing with media twice-branched; hind wing with both 
media and cubitus. Rostrum with V indistinct. Living on leaves and stems of 
herbaceous plants. 
Genotype (monotypical), Aphis torticauda Gillette. 
Chief Distinguishing Characters. Peculiar shape of the cauda, cylindrical 
reticulated cornicle and moderately developed frontal tubercles. 
Key to Species of Bipersona 
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Bipersona ochrocentri (Cockerell) n. comb. 
Aphis ochrocentri Cockerell, 1903d:248. 
Apterous Vivipara. Head, thorax and most of underparts pale pink; abdomen brownish 
plumbeous; delicately pruinose, more or less shining on disc; abdominal VII and VIII pale 
green; apical half of appendages and cornicle black. Body length 3; stout, pyriform; antenna 
failing to reach cornicle by half of cornicle length; cornicle more than twice length of cauda; 
cauda about as long as hind tarsal II; rostrum considerably surpassing hind coxa. Young. 
Pink. 
Alate Vivipara. Similar to apterous vivipara but darker; bases of wings delicate green. 
Antenna shorter than body, III .60, IV .38, V .36, VI .15+.66, secondary sensoria on III ex- 
tremely prominent, 25 or more, on IV about 6; rostrum attaining abdomen, about 1.40 long, 
its terminal segment .35; cauda about .20, slender; ‘‘cornicle rugose-tessellate’”’ .50 long, .06 in 
diameter, not swollen in middle; hind tarsal II .23. 
Collections. On Carduus ochrocentrus. New Mexico: Pecos. Colorado: 
Probably Custer County (Cockerell, 1893:366). Alate and apterous viviparae 
July 13; one collection but abundant on that occasion. 
Above description and records are rearranged from original description by 
Cockerell, since type specimens are, at present, unavailable. 
Genotype Bipersona torticauda (Gillette) 
The Red Thistle Aphid 
Aphis torticauda Gillette, 1907 :389-391. 
Aphis cnici Williams, 1910:40, (preoccupied); Davis, 1911b:12. 
Bipersona torticauda, Gillette and Palmer, 1934:143. 
Fundatrix. Yellowish brick-red, lighter anteriorly; not pruinose; appendages, cornicle, 
cauda and anal plate black. Body length 2.50; hind tibia 1; antenna 1.60; cornicle .43-.45; 
otherwise as in summer vivipara. : 
Apterous Summer Vivipara. Young Nymph. Pale yellow, mottled with coral-red. 
Adult. Brick-red to red-ochre; naked; appendages and cornicle black; cauda and anal plate 
reddish to dusky distally. Body length 3.2-3.75; hind tibia 1.9-2; hind tarsal II .17-.20; an- 
tenna 2-3; rostrum acute, attaining abdominal I or II. 
Alate Vivipara. Brick-red to ochre-red; naked; thoracic lobes brownish; all appendages 
dusky to black; wings hyaline. Body length 2.1 and slender to 3.40 and robust; hind tibia 
1.60-1.90; hind tarsal II .15-.17; antenna 2.10-2.50. Hairs spinelike; on appendages and body 
about .03 long, ssemierect and moderately numerous; on cauda .05-.07 long, straight to curved 
