SUBFAMILY APHINAE 29 
Lachnus edulis Wilson, 1919b:44; Palmer, 1926:314; Knowlton, 1930:155. 
Cinara edulis, Gillette and Palmer, 1931:851. 
Fundatrix. Same as apterous summer vivipara. 
Apterous Summer Vivipara. Nymph. First instar, dark brown with median line and 
meso- and metathorax pale; appendages pale. Adult. Shining black with fine median line and 
lateral patches powdery; legs mostly blackish, light portions orange-yellow. Body 3-4 long; 
hind tibia 2.5-3; hind tarsal II .26; antenna 1.3-1.5, 
Alate Vivipara. Same as aptera in color and measurements. Antenna with secondary 
sensoria somewhat tuberculate. Rostrum attaining abdominal V. Hairs on hind tibia fine, 
pointed, numerous; on body about the same or slightly shorter. 
Ovipara. Apterous. Without powdery tip on posterior segments of abdomen; same as 
apterous summer vivipara except as follows: Body more elongate and hind tibia very slightly 
swollen on proximal half and bearing small, convex sensoria scattered over nearly entire 
length. 
Male. Alate. Black throughout; wings smoky. Body length 1.50; antenna 1.05. Other 
measurements as in alate vivipara. 
Egg. Jet black; without powder. Length 1.35. Laid lengthwise in rows of 6-8 on upper- 
side of needles of pine. 
Collections. On Pinus edulis, bark of limbs and older twigs; in large 
colonies. Colorado: Owl Canyon (in Larimer County), Salida, Trinidad and 
Walsenburg. Utah: Hannah, Tabiona and Mount Alice. Fundatrices May 24 
to June 8, apterous viviparae May 27 to Sept. 25, alate viviparae May 27 to 
Sept. 18, sexuales Oct. 18 to 28; common. As recorded by Knowlton (op. cit.) 
on Pinus monophylla (Utah: Raft River Mountains. Alate and apterous vivi- 
parae, June 19), occurred a form differing from edulis apparently only in IV 
being one-fifth shorter than V instead of approximately equal. 
Cotypes. Granovsky and Colo. Agr. Exp. Sta. Collections. 
This species is structurally very close to C. schwarzii, but differs slightly as 
follows: Orange-yellow legs, slightly pulverulent body markings, length of 
hairs (longer than .03-.05 on hind tibia) and host plant. Since it is the rule for 
this genus to be specific as to host plant, it seems best to count the species 
distinct until biological tests settle the identity. 
Cinara engelmanniensis (Gillette and Palmer) 
The Light Brown Spruce Aphid 
ABZ 
2 Sa? Ba RSE 
at a = = eS Se SSS SS 09 
Fig. 22. Cinara engelmanniensis 
Lachnus engelmanniensis Gillette and Palmer, 1925:527. 
Cinara engelmanniensis, Gillette and Palmer, 1931:852. 
Apterous Summer Vivipara. Sordid tan; with two rows of blackish areas from pronotum 
to tip of abdomen, areas confluent on abdominal VII and VIII; pulverulence evident only on 
intersegmental lines; cornicle hardly darker than body; legs pale with only tarsi and tips of 
tibiae blackish; antenna pale, dark only on tips of segments and entire I, II and VI. Body 
3 by 2; antenna .90-1.1*; hind tibia 1.2-1.3, hind tarsal II .35-.40. Hairs on hind tibia rather 
fine, numerous, 1.5 times as long as diameter of tibia; on antenna and body .10. Rostrum 
attaining between abdominal I and II. 
*In original description, apterous vivipara may have been immature ovipara. 
