266 . DAVENPORT ACADEMY OF SCIENCES. 



after the pemphigiens have left or become destroyed, 'i Usually but one 

 female, or at. most a few, was to be found in the gall, together with a great 

 number of pseudova in a pile that often would, be several times the female 

 in bulk." 



This Species I have failed to see. 



Phylloxera popularia Pergande, n. sp. 



Plate XXL, iigs. 159, 160. 



I/arge numbers of females and their eggs were discoyered by 

 Mr. E. A. Schwarz, December, 1878, in'deserted 'galls of Pemphi- 

 gus transversus Riley on Populus tnonili/era at Columbia, Texas, 

 and duringjjanuary of the following year at Bayou Sara, La., in 

 similar galls and in cracks of a black knot, growing on the 

 branches of the same tree, about forty feet above the "ground. 

 Additional specimens were received during July, 1891, from 

 Alma, Mich., found in empty, though still green and succulent, 

 galls of Pemphigus populicaulis Fitch. Other specimens, found 

 in galls on Cottonwood in September, 1891, at Brookings, S. D., 

 were received from Mr. T. A. Williams. During October of 1900 

 the same species was found by me at St. Louis, Mo., in galls of 

 Pemphigus transversus Riley, which were still fresh and had but 

 recently dropped. 



Apterous female. — Length about i.4"""'- 



The young females, as found in May, are pale greenish- yellow 

 and densely covered with min'ute points ; antennae and legs are 

 pale dusky, the rostrum is black and reaches to the end of the 

 body. The larv« are of the color of the female, the eyes red, the 

 rostrum dusky, extremely long and almost twice the length of 

 the body. 



Females or sexuparse, found in October, are brownish-yellow, 

 the eyes brown, and antennae and legs pale dusky. Shape pyri- 

 form, the thorax stoutest and rounded ; front^of^head more or less 

 distinctly concave. Dorsum densely covered with'minute,'pointed 

 tubercles. The rostrum reaches considerably beyond. the third 

 coxae. Antennae much shorter than the posterior diameter of the 

 head ; first joint much the stoutest and somewhat tapering ; the 

 second- joint is mjich narrower, distinctly longer and clavate ; 



