PERGANDE NORTH AMERICAN PHYLLOXERIN/t. 269 



longer than the first, in the male being sometimes ahiiost globu- 

 lar ; the thumb is .minute and placed near the apex. There are 

 faint indications of three or four annulations, and the tip is pro- 

 vided with two minute hairs. Surface of body minutely granu- 

 late ; besides the granulation there are, on each side of the thorax 

 of the female, three more or less prominent lateral tubercles. 

 Rostrum rudimentary. 



With each of the pupiferous females were found from one to 

 eight eggs, most of them sexual though occasionally a few 

 smaller ones, which produced non-sexual larvse, with a long and 

 well-developed rostrum. This may possibly produce a migratory 

 generation the following season. These larvae are scarcely 0.2'"™- 

 in length, with the rostrum extending beyond the tip of the abdo- 

 men. Color yellow ; eyes brown ; antennae, legs and rostrum 

 pale dusky. Surface of body similarly granulated to that of the 

 parent. Antennas rather long and slender, reaching to base of 

 first pair of legs ; joint i shortest and stoutest, narrowest at apex; 

 joint 2 considerably longer, more slender and stoutest near the 

 end ; joint three 3 nearly twice the length of the other two com- 

 bined, very slender and of uniform diameter, with two fine hairs 

 at tip ; thumb minute, though quite distinct. 



The species was found during September on some small shrubs 

 of either Salix discolor or kumilis (species not determinable with- 

 out the flowers), growing in a swampy spot in the middle of a 

 piece of woods in the District of Columbia, with no other willows 

 within a radius of a mile or more. 



Phylloxera NYSS^e Pergande, n. sp. 



Plate XXL, figs. 169-174. 



This species, like the preceding one, is equally remarkable on 

 account of the white secretion which covers it completely, giving 

 it a decided resemblance to Pseu'dococcus . It is much larger and 

 stouter than Ph. salicicola, with the antennae of the pupiferous 

 female shorter and those of the sexes longer than in that species. 



Pupiferous female. — Length i-i .3"^™-. Shape broadly ovoid; 

 broadest across the thorax. Surface of body densely covered with 

 extremely minute points. Color lemon-yellow. Eyes red, minute, 



[Proc, D. a. S., Vol. IX.] 33 FJan. 28, 1904. 1 



