Vol. xxv] ENTOMOLOGICAL NEWS. 269 
Two Colorado Plant Lice (Hemip.-Homop.). 
By C. P. Gittetre, Fort Collins, Colorado. 
(Plate XI.) 
Asiphum pseudobyrsa Walsh. 
Byrsocrypta pseudobyrsa Walsh:—Proc. Ent. Soc. Phil., Vol. I, p. 
306, 1862. 
Pemphigus pseudobyrsa Walsh:—Proc. Ent. Soc. Phil, Vol. VI, p. 
208, 1866. Thomas:—Rept. Ent. Ill, Vol. VIII, p. 151, 1880. Oest- 
lund:—Aph. of Minn., p. 24, 1887. Packard:—Forest Insects, p. 
434, 1890. Hunter :—Aph. of N. A., p. 79, 1901. 
Schizoneura populi Gill.:—Ent. News, Vol. XIX, p. 1, 1908. 
This species, described by Walsh more than fifty years ago, 
seems to have no recorded observations upon it since, except 
for the one which was made by the writer in ENTOMOLOGICAL 
News for January, 1908, where the winged migrants, found 
in company with an apterous form of a species of Chermes 
upon the bark of the Balm of Gilead, were taken to be the alate 
form of the same louse. 
Figures A and B of Plate XI were used in that paper in con- 
nection with the description of the supposed new species. 
Figures C, D and E of the same original plate (Vol. XIX, 
Pl. I), used to illustrate the apterous form, I still believe rep- 
resented a new species which we shall now have to name 
Chermes populi. The alate form of this species I have never 
seen, though the apterous lice are very common on cotton- 
wood bark in Colorado and especially on the western slope 
about Grand Junction. 
Asiphum pseudobyrsa has been taken several times by Mr. 
L. C. Bragg about Fort Collins, Boulder and Denver upon the 
leaves of Populus coccinea and I have also received specimens 
from Mr. Asa C. Maxson from the same tree at Longmont, 
Colorado. 
This species is a true Asiphum, the young lice all leaving 
the stem-mother gall, which is a small almond-shaped pocket 
about midway on the midrib of the leaf, very soon after being 
born, and locating on the under or ventral surface. The larvae 
locate along the main veins into which they insert their beaks 
