SUBFAMILY APHINAE 161 
Male. Apterous. Body length .85-.90; hind tibia .41; antenna .65-.70. Otherwise as in 
apterous vivipara. 
Collections. On leaves and twigs of Chrysothamnus graveolens, C. vis- 
cidiflorus and C. parryi and Ratibida columnaris, but not recorded as notice- 
ably distorting leaves. Colorado: Fort Collins, Denver, Bellvue, Antonito, 
Manassa, Axial, La Porte and Boulder. Apterous summer viviparae June 2 to 
Oct. 20, alate viviparae June 16 to Aug. 29, oviparae Oct. 11 to Nov. 8, males 
Oct. 20 and 22; rather common. 
Se 
Fig. 181. Aphis ornata 
Chief Distinguishing Characters. Pink body and dorsal dusky markings of 
the aptera, rather acutely tapering cauda with not more than 5 pairs of lateral 
hairs and short cornicle (shorter than unguis and shorter than the rather long 
rostral IV+V). 
Type. U.S.N.M., No. 41454. Paratypes, Colo. Agr. Exp. Sta. Collection. 
This species is very close to A. gregalis. The only differences noted are as 
follows: Pink body instead of green in apterous vivipara, longer unguis (.14-.21 
instead of .11-.14). Furthermore, collections of A. ornata were all taken on 
eastern slope of the Rockies and on Chrysothamnus graveolens while A. greg- 
alis have all been taken west of the Continental Divide and on C. viscidiflorus. 
Knowlton’s species is reported to cause distortion of leaves while this has not 
been recorded for ornata. 
Aphis pentstemonicola Gillette and Palmer 
(Plate V, 1-7) 
Aphis pentstemonicola Gillette and Palmer, 1929a:23 and 1932b:428. 
Fundatrix. Pale green; dusky on head, dorsolateral portions of pronotum, lateral areas 
of all segments, patch posterior and mesad of each cornicle and slight dorsal dashes on ab- 
dominal VII and VIII and sometimes traces on VI. Body length 1.72; hind tibia .72; antenna 
1, III and IV often coalesced. Otherwise as in apterous summer vivipara. 
Alate Vivipara. Head and thorax black; otherwise color about as in summer apterous 
vivipara. Body length 1.80; hind tibia .75-.90; hind tarsal II .12; antenna 1.20*; rostrum 
attaining between 2d and 3d coxae. 
Apterous Summer Vivipara. Young. Born of fundatrix. Pale green with head brownish. 
Born of summer vivipara. Pale green; brownish on head; with dark green spot on dorsum of 
abdomen. Adult. Light yellow or greenish yellow, mottled with darker green; marked with 
dusky on head, thorax, (broken on metanotum), lateral areas on all abdominal segments, a 
patch at base of each cornicle, and dorsal dashes on VI, VII and VIII; cornicle, antenna, 
cauda and anal and genital plates dark; legs pale to dusky, with tarsi and tips of tibiae 
blackish. Body length 1.8-2; hind tibia 1; hind tarsal II .12; antenna 1-1.3,* secondary sensoria 
*The number of secondary sensoria and meastrements seem to be unstable especially 
in the aptera, varying and intergrading sometimes in apparently the same colonies so 
that no distinctive specific line can be drawn. In extreme cases sensoria on III were 
absent or varying up to 18 and clustered at distal end. Antennal segments may be as 
short as .14-.19 for III,.12 for IV, .10-.12 for V, .08-+.13 for VI. Alate viviparae taken 
with these apterae also showed fewer sensoria and shorter measurements as follows: 
III .20-.24, IV .14, V .13, VWI .10-+.19, sensoria 20-24 on III, 12 on IV, 5-7 on V. 
Possibly these are special life cycle forms if not another species. 
