110 APHIDS OF THE ROCKY MOUNTAIN REGION 
IV .40-.50, V .35-.38, VI .20-.23-++.18-.21, sensoria usually 2-3 rarely 12 on III. Hairs about as 
in alate vivipara except hairs on hind tibia .06-.10 (diameter of tibia .10); on body .10-.12. 
Cornicle greatly swollen in the middle. Young. Pale bluish green with pale brown on head; 
appendages yellowish. 
Alate Vivipara. Same as apterous vivipara in measurements and color except antenna 
which is dark throughout. Wings hyaline, veins bordered with smoky, posterior edge of stigma 
with a few scattered setulae .04-.05 long. Hairs pointed, numerous; on vertex .10-.11; on an- 
tenna .07-.10 (diameter of III .05-.07); on hind tibia erect, .08-.12 long (diameter of tibia .07). 
Rostral IV+V .17 long, obtuse, attaining between 2d and 3d coxae. Secondary sensoria small. 
Ovipara. Same in color as apterous vivipara. Body slightly elongated 4-4.1 long; hind 
tibia about 1.90 and bearing scattered minute sensoria on proximal third to half; antenna 1.75, 
III .50-.55, IV .35-.38, V .25-.30, VI .18-+-.18, cornicle .60. Otherwise as in apterous vivipara. 
Male. Apterous. Color same as in ovipara. Body 2-3 long, slender. Antenna 1.70, III .63, 
IV .34, V .32, each pe atiee small sensoria, VI .17+.13. : 
Apt Viv4S — 55 
AlateViy 45 . » 
Fund, 42 
Fig. 120. Pterocomma salicis : 
Collections. On bark of Salix sp. Colorado: Fort Collins, Boulder, Eldora, 
Colorado Springs, Log Cabin (west of Livermore) and Gunnison. Utah: Farm- 
ington, American Fork Canyon, River Heights and Mount Timpanogos. Funda- 
trices May 25 to 29, apterous viviparae May 28 to Oct. 16, alate viviparae May 
28 and Aug. 6, sexuales Oct. 16; hardly common. ; 
Chief Distinguishing Characters. Large orange-yellow, swollen cornicle. 
Pterocomma smithiae (Monell) 
Willow Grove Aphid or Black Willow Aphid 
Chaitophorus smithiae Monell, 1879:32. 
Pterocomma smithiae, Baker, 1916a:287. 
Clavigerus smithiae, Hottes and Frison, 1931a:166; Gillette and Palmer, 1931:934. 
Fundatrix. Same color as summer vivipara with considerable variation in depth of color. 
Body 3-3.25 by 1.70-1.75; antenna 1.20, III .33-.40, IV .20, V .20, VI .13+.09. Ota as in 
summer vivipara. 
a late= . 
cornicie Apt. Viv. 
125-30 
Leta aryiel) IO Jo! 
A ovo O19 foo 
29 - 30 
Fig. 121. Pterocomma smithiae 
Apterous Summer Vivipara. Nymph. New-born, pink or salmon color; later, dark reddish 
brown, yeliowish on head; appendages pale yellowish. Adu/t. Dark rusty brown with slight 
powder which gives a bluish effect, often with narrow dorsal gray line and lighter about base 
of each cornicle; appendages and cornicle golden yellow; tarsi, tips of tibiae and of rostrum 
and of antenna blackish. Body length 3-4; hind tibia 1.65-1.9; hind tarsal II .20-.22; antenna 
1.50-1.70, III .48-.53, IV .18-.27, V .21-.28, VI .13-+.17-.18; cornicle .25-.30 moderately swollen. 
Hairs as in alate vivipara. 
