SUBFAMILY APHINAE 199 
-02-.03 long on hind tibia; cornicle cylindrical to slightly tapering and gently curved outward, 
imbricated and with distinct flange. Cauda tapering, bearing about 3 hairs on each side and 
one dorsal preapical one. Fore wing with 2d fork of media sometimes obsolete. 
Collections. On leaves and twigs of willow (Salix sp.), as winter host; cel- 
ery (Apium graveolens), as summer host. Utah: Big Cottonwood Canyon. Col- 
lections taken in Colorado Springs, Colorado June 22 and Oct. 19 may possibly 
be fundatrices and oviparae respectively. Alate and apterous summer viviparae 
taken in New York at Geneva and Albany and in Massachusetts at Webster 
June 19 to July 1; evidently rare in region. 
Type. U.S.N.M., No. 41938. Paratypes, Colo. Agr. Exp. Sta. Collection. 
3 RIO Ee eee a 
i) Wie ets Af GSH BAO 
COR O28 235 Tub 
——— 
Apt Viv oS 149 yyy 
ery 
Fig. 230. Cavariella theobaldi 
This name is given by Theobald (1927:171) as a synonym of Aphis saliceti 
Kaltenbach. Theobald was undoubtedly judging from his own material, a mix- 
ture of A. saliceti and Cavariella capreae used for article (1912:84) to which 
Gillette refers in his original description as apparently the same. However, 
since Gillette’s description was from actual specimens taken in America pre- 
senting this combination of characters, the species surely must stand inde- 
pendently of errors in Gillette’s interpretation of Theobald’s material above- 
mentioned. 
There seems to be a very close resemblance to Cavariella umbellatorum 
(Koch) as described by Theobald (1927:15) but in the alate vivipara antennal IV 
is figured as more than third of the length of III, and IV-+V exceeds three- 
fourths of III, while in C. theobaldi, IV is usually less than third of III, and 
IV-++V is equal to only half to two-thirds of III; the cornicle in the alate vivipara 
in Theobald’s and Koch’s descriptions exceeds two-thirds of III, while in Gil- 
lette’s species it does not exceed two-thirds. Until further study shows these 
differences to be invalid it seems that the species must be considered as distinct. 
Genus Durocapillata Knowlton 
Knowlton, 1927c:229. 
Characters. Frontal tubercles moderately developed, not attaining vertex. 
Cornicle cylindrical, with prominent flange immediately preceded by abrupt 
encircling constriction. Hairs prominent, capitate to blunt cn body and append- 
ages. Cauda tapering. Secondary sensoria circular. Wing venation typical for 
Aphina. 
Genotype (monotypical), Durocapillata utahensis Knowlton. 
Only one species represented in region. 
Genotype Durocapillata utahensis Knowlton 
Durocapillata utahensis Knowlton, 1927c:229 and 1929a:7. 
Apterous Summer Vivipara. ‘‘Yellow-green; shiny.’”’ (Mounted in balsam), pale with 
anteuna cornicle, tarsi and tips of tibiae slightly dusky (‘‘black” in life) ; cauda and remainder 
