SUBFAMILY APHINAE 35 
Hairs on hind tibia semispinelike to fine, shorter than diameter of tibia, numerous. Rostrum 
attaining middle of abdomen. 
Alate Vivipara. Same as aptera in color and measurements or slightly smaller. Fore 
wing with media twice-forked. Hairs fine; on tibia slightly longer than diameter of tibia. 
Ovipara. Apterous. Darker than vivipara and with abdomen posterior to cornicles pul- 
verulent. Structural characters same as in apterous vivipara except hind tibia which is hardly 
swollen but covered with sensoria. 
Male. Alate. Same as alate vivipara except as follows: Body length 2.50; hind tibia 
1.90. 
Egg. Newly-laid, light amber-brown; later, black; naked. 
Collections. On Pinus contorta var. murrayana on bark of tender twigs and 
young branches. Colorado: Bellvue foothills, Laramie-Poudre Tunnel, Pingree 
Park and Tolland. Utah: Logan, Little Bear and Beaver Creeks. Idaho: Boise 
and Immigration Canyon Creek. Fundatrices May 9 to June 9, apterous sum- 
mer viviparae May 31 to Sept. 16, alate viviparae May 31 to RRL 17, sexuales 
Oct. 2 to 19; common. 
Type. U.S.N.M., No. 41961. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Metatypes, Hille Ris Lambers Collection. 
This species closely resembles C. brevispinosa and C. murrayanae from the 
same host, differing only in the length of the tibial hairs. Hairs on hind tibia 
in brevispinosa aptera .04 long, in alata .05; in murrayanae hairs in aptera and 
alata .10-.15 long; in medispinosa hairs in both alata and aptera .07-.08 long. 
That these differences are not accidental.variations is indicated by the results of 
several breeding experiments with brevispinosa and medispinosa, involving 50 
individuals in each species and in one case 6 generations (see Gillette and 
Palmer, 1924:29). Accordingly until further biological tests perhaps through 
the sexual cycle prove otherwise it seems safest to consider these forms distinct. 
C. medispinosa resembles C. villosa and C. pseudoschwarzii, differing from 
the former as follows: length of tibial hairs (shorter than .11 in alata) and their 
slightly more sparse arrangement and more scanty pulverulence on body and 
from the latter in the more drooping tibial hairs. These differences are slight 
and even perhaps doubtful. Host transfer tests are needed to settle the question. 
Cinara murrayanae (Gillette and Palmer) 
_ The Long-haired Lodgepole Pine Aphid fying 
© a) > Viv. 
FR RS SNS 
Alate VV 5: BN 
Fig. 29. Cinara murrayanae 
Lachnus murrayanae Gillette and Palmer, 1924:26 and 29. 
Cinara murrayanae, Gillette and Palmer, 1931:860. 
Same in color and measurements as C. medispinosa, differing only in the 
hairs which are heavier, more erect and longer. Hairs on hind tibia somewhat 
longer than diameter of hind tibia in apterous vivipara and almost twice in alate 
vivipara. 
