130 APHIDS OF THE ROCKY MOUNTAIN REGION 
Aphis chrysothamni Wilson 
Aphis chrysothamni Wilson, 1915a:101. 
Apterous Summer Vivipara. Head wine color, lighter on thorax; abdomen light green 
to pinkish, mottled and with dorsal dark spot; tip of abdomen pulverulent; cauda and cornicle 
dark. Body length 1.7-2-‘‘2.35”; across eyes .44; hind tibia .65-.80; hind tarsal II .11; rostrum 
acute, attaining to abdomen. Young. Body green. 
Alate Vivipara. Head and thorax black, abdomen light green mottled with darker green; 
antenna, cauda and cornicle dark; tibiae somewhat dusky. Body length 1.55; across eyes .41; 
antenna about 1.25 long; hind tibia .68-.75; hind tarsal II .12; rostrum acute, tip needlelike 
in ventral aspect, attaining or surpassing 3d coxa. 
Alate 12-"24" 
< 
Apt.24 -.33 
R. << 
Collections. On Chrysothamnus nauseosus subsp. nauseosus. Utah: Brig- 
ham, Collinston, Parowan, Hooper, Trenton, Amalga, Honeyville, Smithfield 
and Gusher. Idaho: Malad. Alate and apterous viviparae June 9 to Aug. 16; 
fairly common. 
Type. Either U.S.N.M. or Granovsky Collection. Paratypes, Colo. Agr. 
Exp. Sta. Collection. 
On July 31 and August 16, near Honeyville and at Fisher Pass, Utah, 
apterous viviparae were taken which closely resemble the cotypes except for 
exhibiting smaller size in all parts except rostrum and unguis, with measure- 
ments as follows: Body 1-1.5; ITI .20-.25, IV .15-.21, V .14-.16, VI .11-.13-++.14-.20; 
cornicle .12-.22. On June 8, near Brigham, Utah, alate and apterous viviparae 
were taken, the alatae being quite typical but the apterae exhibiting relatively 
short measurements agreeing with the above mentioned atypical collection 
excepting III which is nearly typical in length (.28-.30). It appears likely that 
these two collections represent variations of A. chrysothamni but further in- 
vestigation is needed. 
Chief Distinguishing Characters. Acute needlelike but not unusually long 
rostral IV+V (.14), acute and short cauda bearing but 2 pairs of lateral hairs 
set at approximate right angles to the cauda and strongly curved. 
Aphis chrysothamnicola Gillette and Palmer 
Anuraphis chrysothamnicola Gillette and Palmer, 1929:5 and 1932b:391. 
Aphis chrysothamnicola, Gillette and Palmer, 1932b: 391; Knowlton and Smith, 1936g: 
778. 
~ COLT ee 
Apt. Vi ‘ f 4 : ; HV1O- 14 21-24 
oe i" Col Males 
nei. Wik | 
16-22 noe Viv, 
Fig. 140. Aphis chrysothamni 
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09-11 
Fig. 141. Aphis chrysothamnicola 
