168 APHIDS OF THE ROCKY MOUNTAIN REGION 
Collections. On currant and gooseberry (Ribes sp.), curling terminal leaves. 
Utah: Eastern shore of Great Salt Lake. Alate and apterous summer viviparae 
July 6 to 15, Aug. 30 and Sept. 8. 
Type. Knowlton Collection. Paratypes, Knowlton and Colo. Agr. Exp. 
Sta. Collections. 
<0 eV em 
RAINS 074.10 .18-.26 
Fig. 190. Aphis ribi-gillettei 
Chief Distinguishing Characters. Shortness of III (shorter than unguis), 
small size of the body (less than 1.5 in length), short rostral IV+V (.10-.12), 
together with long rostrum (reaching 3d coxa in alata and abdomen in aptera) 
and usual presence of sensoria on V in alate vivipara. 
Aphis rociadae Cockerell 
The Russet-colored Larkspur Aphid 
Aphis rociadae Cockerell, 1903c:115; Davis, 1919:228 (in part—sexuales belong to an- 
other species); Gillette and Palmer, 1932b:436. 
Alate Vivipara. Same color as aptera except as follows: Head and thorax dark brown 
and abdomen with dusky lateral areas anterior to cornicles and dorsal bands on segments IV 
to VIII; tibiae brownish with tips darker; antenna dusky to blackish; cornicle and cauda. 
dark brown. Body length 1.80-2; hind tibia 1.15-1.30; hind tarsal II .13; antenna 1.45-1.70, 
secondary sensoria flat, antenna slightly swollen about sensoria. Hairs blunt or slightly 
capitate; .03-.04 long on body and hind tibia, neither sparse nor numerous, Cornicle cylindrical 
or slightly tapering with distinct flange, smooth. Cauda short, nearly as broad as long, 
parallel-sided with rounded tip, bearing 3 lateral and 2 dorsolateral pairs of hairs. Anal plate 
with median wartlike protuberance; both cauda and anal plate retracted under terminal seg- 
ments of abdomen, Lateral tubercles not apparent. Rostral IV-+V moderately slender, attain- 
ing between 2d and 3d coxae, 
Fig. 191. Aphis piciddne 
Apterous Summer Vivipara. Nymph. Coral red. Adult. Reddish brown or russet to black, 
fading to hazel anteriorly and posteriorly; shining; cauda, cornicle, appendages yellowish to 
pale brownish distally. Size of body 2 by 1.20; hind tibia 1; antenna 1.30-1.60. Otherwise as 
in alate vivipara except as figured. 
Ovipara. Apterous. Dark brown, lighter on head and behind cornicles; cornicle dark 
brown; tibiae brownish with tips dark. Body length 2; antenna 1.15; hind tibia .85, slightly 
swollen in proximal half and bearing scattered flat sensoria. 
Male. Apterous. Head blackish; rest of body yellowish brown, shining; with black 
lateral areas and dorsal spots; antenna, cornicle, anal plate, tarsi and tips of tibiae blackish; 
tibiae brown. Body length 1.35; hind tibia .85; antenna 1.30-1.50. 
Collections. On leaves and stems of Delphinium occidentalis and sp., curl- 
ing leaves tightly. Colorado: Denver, Pueblo, Colorado Springs and Fort 
