248 APHIDS OF THE ROCKY MOUNTAIN REGION 
or slightly wavy. Cauda* slender, appearing twisted or corkscrew-shaped, bearing about 4 hairs 
on each side. Anal plate with median caudalike, stout, nearly cylindrical, broadly rounded 
protuberance bearing curved hairs. Lateral tubercles present on prothorax and abdominal I 
to VII. 
Male. Apterous.** Yellowish to reddish brown to greenish rufous; with all appendages 
dark. Body length 1.60-1.75; hind tibia 1.30; antenna 1.60; cornicle .17. 
Ovipara. Apterous. Color same as in apterous summer vivipara. Body length 2.50; hind 
tibia 1.35; antenna 1.80; cornicle .40; hind tibia somewhat swollen and bearing a few scat- 
tered, small sensoria. 
Egg. Newly laid, light green; later, polished black. 
raee Perit 718 
eas Sen. 36 o-rarel 58 1. 2 
fe - = 32.0523 
26 -.33 
53-6! Sen qe ae al 3/-4; $eno-3 
-13 [core 
Jets eee hs (con a aa 
Apt. Vi¥. rie 30- .35-40---- 
Sats: 294. Bipersona fornia, 
Collections. On leaves and stems of Cirsium sp. Throughout Colorado and 
Utah. Fundatrices May 13 to 22, apterous summer viviparae May 22 to Oct. 27, 
alate viviparae May 30 to July 29, sexuales Sept. 27 to Oct. 18; found in large 
numbers, common. 
Types. U.S.N.M., No. 42817. Paratypes, Colo. Agr. Exp. Sta. Collection. 
This species seems very close to Aphis ochrocentri, judging from the original 
description, but Gillette after examining type specimens considered the species 
as distinct but recorded no detailed comparison. At present the types seem to 
be unavailable so the writer is unable to make a study of them and the species 
are being held distinct mainly following opinion of Gillette together with the 
following differences as compared with the original description: Body not 
“brownish plumbeous and pruinose,” III longer than unguis not shorter and 
number of sensoria on III of alate vivipara not fewer than 36, on IV 7-18. 
Genus Capitophorus van der Goot 
Van der Goot, 1913:84. 
Characters. Vertex convex; frontal tubercles distinctly developed, exceed- 
ing vertex. Antenna six-segmented, with circular sensoria, I somewhat gibbous. 
Hairs on body capitate, globate to funnel-shaped. Cornicle elongate, slender, 
cylindrical or slightly clavate. Cauda tapering to parallel-sided or spoon- 
shaped. Lateral tubercles usually absent. Ocular tubercle inconspicuous. Fore 
wing with media twice forked; hind wing with both media and cubitus. Living 
exposed on leaves and twigs of deciduous plants. 
Genotype (fixed by van der Goot, 1913:145) Aphis carduina Walker. 
*Some aphidologists have interpreted this peculiar cauda as a dorsal tubercle and the 
protruding anal plate as the cauda. Examination of specimens in side view should 
verify Gillette’s interpretation. Especially convincing is the study of live specimens, 
in which case honeydew is seen to emerge just ventrad to the corkscrew-shaned struc- 
ture and on pressure, embryos appear ventrad to the broader projection on the ventral 
<Ore of which are the gonopophyses. 
*Alate males mentioned by Gillette in original description proved to be only shrivelled 
Sav nares 
