258 APHIDS OF THE ROCKY MOUNTAIN REGION 
Type. U.S.N.M., No. 52350. Paratypes, Colo. Agr. Exp. Sta. Collection. 
This species differs from C. pseudoglandulosus as follows: Length of cauda 
(much more than half as long as cornicle instead of third), hairs on head less 
slender, appendages, cauda and rostral IV+V longer and cornicle shorter (not 
A0-.48) than. in the latter species. 
2 (47-70) (sen. 1-2) 48-60) 
u 0A oifo-, S 
Rostr (34D) 683 —|.10) 7 
as rae rr Cornicle 
VA VUIVETECTORANTIN 
__ side of body 136-43) Hind Fibia 
Fig. 306. Capitophorus gnaphalodes 
Capitophorus gregarius Knowlton 
Capitophorus gregarius Knowlton, 1929b:13; Knowlton and Smith, 1936c:110. 
Apterous Vivipara. Spring Form. Dark brown to chocolate-brown; antenna dark brown 
to black; cornicle black; cauda dusky. Body length 2.3-3. Summer and Fall Form. ‘‘Brown to 
greenish brown’’; antenna beginning with distal end of III, cornicle especially distally, tarsi 
and tips of tibiae and of rostrum blackish to black; tibiae and cauda pale to dusky. Body 
_ length 2-3; across eyes .48-.54; antenna 3-4; hind tibia 1.15-1.40-“1.70”’; rostrum attaining 2d 
coxa. Abdomen with a row of conspicuous dorsal tubercles on each side of median line; each 
bearing infundibulate hairs. Hairs stout, slightly capitate to infundibulate and sessile on 
body and antennal I and II; blunt to slightly capitate on III and hind tibia; very numerous 
on body. : 
Alate Vivipara. Antenna pale through base of III, remainder blackish; cornicle pale at 
base, blackish distally; cauda and tibiae pale to sordid yellow. Body length 1.60; across eyes 
.50; antenna 3.50; hind tibia 1.55. Cornicle clavate, flange oblique, imbricated. Cauda parallel- 
sided to slightly tapering, bearing 5-6 hairs on each side and 1-2 dorsal preapical ones. 
_ opting fotm*,50~.53" “Sen.“\-5" "37 — 42 -¥.36-.4 VW. +.35-44" 
S00 75) Senteeaz | 
Corer te re 16 Se LoS 
Ab, Alate .65 seni2-is. wh 
Apt. Viv. 
an enema 
et ee FE 
"25 -1.03~ "1.10" 
Fig. 307. Capitophorus gregarius 
Ovipara. Apterous. “Greenish brown to tan with dorsal dark bands and lateral areas on 
abdomen;”’ hind tibia dark on swollen-portion. Otherwise as in apterous vivipara except cauda 
which is shorter, broader and tapering and hind tibia which is swollen on proximal third to 
twice the diameter of the narrowest part and bearing numerous sensoria. 
Male. Alate. ‘‘Blackish brown’; dark markings as in alate vivipara. Body length about 
1.50-‘'1.75”; across eyes .41-.43; antenna about 3; III, IV and V bearing numerous sensoria 
along posterior side; hind tibia 1.20-1.50. 
Collections. On Chrysothamnus nauseosus subsp. nauseosus and C. vis- 
cidiflorus, on growing tips and on leaves. Colorado: Gateway. Utah: Generally 
in northern part of state. Idaho: Battle Creek, Emigration Canyon and Stone. 
Alate viviparae July 3, apterous viviparae May 17 to Oct. 6, sexuales Oct. 6 to 
Nov. 7; in large. colonies, rather common. 
