36 APHIDS OF THE ROCKY MOUNTAIN REGION 
Collections. On Pinus contorta var. murrayana, on bark of twigs and small 
branches. Colorado: Manassa and Bellvue foothills. Utah: Logan. Idaho: Boise. 
Fundatrices May 20, apterous summer viviparae June 3 to July 6, alate vivi- 
parae June 3, sexuales Oct. 2 to 9; rare. 
Type. U.S.N.M., No. 41960. Paratypes, Colo. Agr. Exp. Sta. Collection. 
The distinct status of this form in respect to C. medispinosa and C. brevis- 
pinosa is indicated by the fact that in breeding experiments (see discussion 
after the latter species descriptions) with said species no individuals appeared 
with the characters of C. murrayanae. All colonies of the latter, investigated so 
far, have been homogeneous as to form. 
Cinara occidentalis (Davidson) 
The Flocculent Fir Aphid (Plate II, 1-6 
Fig. 30. Cinara occidentalis 
Lachnus occidentalis Davidson, 1909:300; Wilson,, 1912a:193; Palmer, 1926:308. 
Cinara occidentalis, Gillette and Palmer, 1931:861. 
Fundatrix. Brownish olive-green; with 2 longitudinal rows of dark areas; covered with 
flocculent pulverulence; with cornicle dark and with appendages pale yellowish with black 
only on tip of antenna, extreme tips of tibiae and distal half of tarsi. Otherwise same as sum- 
mer apterous vivipara. 
Apterous Summer Vivipara. Light olive-green; pulverulent with cornicle greenish with 
black tip; appendages as in fundatrix. Body 2.5-3 by 1.5-2; hind tibia 1.1-1.3; hind tarsal II 
.32; antenna 1-1.1; rostrum attaining abdominal II. Ocular tubercle not evident. Hairs fine; 
on body .10, erect, fairly abundant; on hind tibia length 2-3 times diameter of tibia. 
Alate Vivipara. Head and thorax cinnamon-brown to blackish; abdomen light olive- 
green; flocculent throughout; cornicles concolorous with abdomen but with black tips; ap- 
pendages very pale yellowish brown; knees and distal half of tarsi blackish; tips of tibiae 
slightly brownish. Body 2; hind tibia 1.3; hind tarsal II .37. Hairs on hind tibia in length 
equalling 3 times diameter of tibia. Fore wing with media normally twice-forked but fre- 
quently once-forked and occasionally simple. Otherwise as in aptera. 
Ovipara. Same as apterous vivipara except hind tibia, which is considerably swollen and 
bearing numerous sensoria on entire length. 
Male. Alate. Similar to alate vivipara except size which is slightly smaller and antenna 
.90. 
Egg. Newly laid, pale honey-yellow; later, black; slightly powdery. Size 1.2-1.3 by .5. 
Collections. On Abies lasiocarpa and A. concolor, on bark of twigs, eggs 
laid singly on needles, usually only one to a needle. Colorado: Laramie-Poudre 
Tunnel, Rocky Mountain National Park and foot of Long’s Peak. Utah: Big 
Cottonwood Canyon. Fundatrices May 20 to July 7, apterous summer viviparae 
June 14 to Sept. 16, alate viviparae June 10 to Sept. 16, sexuales Sept. 16 to Oct. 
21; common. 
