PERGANDE — NORTH AMERICAN PHYLLOXERINjE. 267 



joint three is slender, about as long as the two basal joints com- 

 bined, and faintly tapering ; the tip is bluntly rounded and bears 

 a few short hairs. Sensorial thumb minute, placed close to the 

 apex of the joint. Legs normal. 



Sexual female. — With the sexuparse, found in galls in Octo- 

 ber, were also found numerous yellow or greenish-yellow eggs 

 besides some sexual females, which measure about 0.2™™- in 

 length. They are oval in shape and about twice as long as 

 wide and completely filled with a single egg. Color yellow or 

 pale greenish-yellow and sometimes dusky along each side. An- 

 tennae short, stout, barely as long as the width of the head in 

 front ; the two basal joints are stout, about as long as broad, sub- 

 equal in length 3and somewhat stoutest at the apex ; joint three 

 is about as long as the two basal joints combined, fusiform, with 

 three or four shallow annulations at the terminal half. Rostrum 

 wanting, represented by a small swelling. I/Cgs short and stout. 



On account of the food-plant and the same habit, I have hesi- 

 tated to consider it different from P/i. prolifera Oestlund, but, 

 since its rostrum is much longer and its body covered densely 

 with minute points, I have concluded to consider it as different 

 and describe it herewith as new. 



In connection herewith I may mention the fact that in Septem- 

 ber of 1 90 1 I discovered two small specimens of Phylloxera in the 

 empty burrow of Oberea in a twig of Populus monilifera, from 

 Cleveland, Ohio; whether mature or not, cannot be determined, 

 in which the rostrum is very much longer than the body, while 

 the dorsum is destitute of tubercles and the proportions of the 

 antennal joints apparently different from those of the other two 

 species. They may possibly prove distinct from either of them. 



Phylloxera salicola Pergande, n. sp. 



Plate XXL, figs. 161-168. 



This and the following species {Ph. nysscs) are the most remark- 

 able so far discovered in this country, and appear to be closely 

 related to Ph. popularia Pergande and Ph. prolifera Oestl. and/%. 

 salicis Ivicht., of none of which the winged or migratory form has 

 yet been observed, though it doubtless exists. The present species 



