SUBFAMILY APHINAE 101 
ondary sensoria 10-20 on III, 0-2 on IV*. Cornicle truncate, shorter than broad. Cauda semi- 
lunar; anal plate entire. Hairs on body of two kinds, one kind moderately heavy, spinelike, 
-09 long, the others fine, .06 long; on vertex same as on body; on antenna fine, .04-.05; on hind 
tibia .05 (diameter of tibia .04, of antenna .03). Posterior border of stigma of fore wing with 
scattered setulae. Rostral IV+V .22, attaining abdominal I or II. 
Ovipara. Apterous. Color similar to apterous vivipara. Body length about 2; hind tibia 
.80; antenna .85, III .25, IV .15-.20, V .13-.17, VI .10+.06; rostral IV+V .20. Hind tibia only 
slightly swollen on proximal half and bearing scattered small convex sensoria. 
Male. Apterous. Golden to dingy brown with head, prothorax and dorsal dashes on all 
segments dark or dusky brown. Body length 1.6; antenna .85, bearing sensoria on III, IV 
and V. 
Collections. On Salix sp., on bark of older limbs and trunk, usually at or 
beneath the surface of the ground. Colorado: Fort Collins, Denver, Antonito, 
and Rocky Ford. Idaho: Parma. Fundatrices May 2, apterous summer vivi- 
parae July 1 to Sept. 23, alate viviparae May 28 and Aug. 11, sexuales Oct. 10 
to 31; rather common. 
Cotypes. Essig and Colo. Agr. Exp. Sta. Collections. 
This species is exceedingly difficult to separate from the form here deter- 
mined as P. macrostachyae. Indeed the slightly longer hairs, longer rostral 
IV+V (.22-.25 not .18-.20), lighter coloration, and the habitat at the surface of 
the ground seems to be the only distinguishing characters. 
Not figured on account of similarity to P. macrostachyae. 
Periphyllus saliciniger (Knowlton) n. comb. 
Neothomasia salicinigra Knowlton, 1927b:199 and 1928e:233. 
Apterous Summer Vivipara. ‘‘Black, lighter on mid-dorsal line’; antenna dark except 
III and base of IV; legs black. Body length 1.75-2; across eyes .44; hind tibia .60-.65; hind 
tarsal II .13-.15; rostrum attaining between 2d and 3d coxae. Hairs on body of two kinds, one 
kind simple, fine hairs and others heavy spinelike hairs with double points, bifid. 
Alate Vivipara. “Black,” (cleared and mounted), abdomen with dark dorsal bands and 
lateral spots; antenna except base of III, cornicle and legs black; wings hyaline. Body length 
1.35-2; across eyes .40; hind tibia .60-.75; hind tarsal II .12-.14; rostrum attaining between 
2d and 3d coxae. 
(ht es 
Side of aodomens 
Fig. 109. Periphyllus saliciniger 
Collections. On Salix sp. on bark of twigs. Utah: Cedar Canyon. Colo- 
rado: Manassa. Fundatrices May 22, apterous and alate viviparae July 8; rare. 
Type. Knowlton Collection. 
Chief Distinguishing Characters. Hyaline wings, long unguis (twice the 
length of base of VI), short rostral IV+-V (.12 in length, about half the length 
of unguis) and double-pointed or bifid spines on the body of the apterous 
vivipara. 
*Three alate viviparae were taken on which the secondary sensoria were not evident 
on the antenna, but in all other characters they apycar to agree with the other 
examples. 
