SUBFAMILY APHINAE 15 
cylindri¢al, blunt, bearing primary sensorium. Hairs slightly capitate; on hind tibia at angle 
of 45-60 degrees, 1.5 times as long as diameter of tibia. 
Alate Vivipara. Head and thorax brown; abdomen medium green with dusky dots co- 
alesced into broken crossbands; antenna dusky brown; all tibiae and tarsi black. Body 
1.7 by .75; hind tibia 1.05-1.3; antenna .57. Otherwise same as apterous vivipara except hairs 
on hind tibia about twice as long as diameter of tibia. Fore wing with media usually once- 
branched, rarely simple. Rostrum attaining the 3d coxa or abdomen. 
Ovipara. Apterous. Yellowish dusky green becoming yellowish brown on head and 
prothorax and with numerous small fuscous spots at bases of hairs; tibiae, tarsi and tip of 
antenna blackish. Body 1.7 by .50; antenna as in apterous vivipara; hind tibia .72-.80, 
hardly swollen but bearing large sensoria along posterior border. 
Male. Apterous. Dusky or olive-green posteriorly, shading to light rusty brown on 
thorax and head; appendages rusty brown to dusky. 
Egg. Shining black a few days after being laid; placed lengthwise on upperside of 
needle. 
$ LS 
0. 005622 ANT bia 7D Re) 
Fig. 8. Essigella fusca 
Collections. On Pinus ponderosa var. scopulorum, on bases of needles. 
Colorado: Estes Park, Pingree Park, Bellvue, Log Cabin, Fort Collins, Denver 
and South Saint Vrain Canyon. Utah: Kanab, Beaver Canyon and Logan Can- 
yon. Wyoming: Heron Creek. Fundatrices May 8, apterous summer viviparae 
July 12 to Oct. 21, alate viviparae June 19 to Oct. 7; sexuales Sept. 11 to Oct. 21; 
common but difficult to find on account of secluded location among needles, 
protective coloration and agility in escaping. 
Type. U.S.N.M., No. 41953. Paratypes, Colo. Agr. Exp. Sta. and Hille Ris 
Lambers Collections. 
Chief Distinguishing Characters. Dusky dorsal color in aptera, usually 
once-branched media of fore wing and length of tibial hairs (1.5-2 times 
diameter of tibia). 
Essigella hoerneri Gillette and Palmer 
The Immaculate Green Pine Needle Aphid 
Rostrum 
Aeon 
Fig. 9. Essigella hoerneri 
Essigella hoerneri Gillette and Palmer, 1924:5 and 1931:840. 
Apterous Summer Vivipara. Head and prothorax brownish; abdomen apple-green 
posteriorly to yellowish anteriorly, without dusky spots at bases of hairs; legs pale; antenna 
pale proximally, dusky distally. Body 1.4 by .5; hind tibia .55-.65; antenna .42. Hairs slightly 
capitate, sparse; almost invisible on antenna, vertex and body except posteriorly on the latter 
