Vol. XXV] ENTOMOLOGICAL NEWS. 269 



Two Colorado Plant Lice (Hemip.-Homop.)* 



By C. P. GILLETTE, 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. 111., 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. 

 Schizoncura populi Gill. : Ent. News, Vol. XIX. p. I, 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, 

 PI. I), used to illustrate the apterous form, I still believe rep- 

 resented a new species which we shall now have to name 

 Chermes pop nil. 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. 



Asiphuin pseudobyrsa has been taken several times by Mr. 

 L. C. Bragg about Fort Collins, Boulder and Denver upon the 

 leaves of Popnlus coccinca and I have also received specimens 

 from Mr. Asa C. Maxson from the same tree at Longmont, 

 Colorado. 



This species is a true Asiphuin. 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 



