PERGANDE — NORTH AMERICAN PHYLLOXERINiE, 205 



verse subdorsal line each side of it; a short, oblique or curved 

 line subdorsally each side, often broken into two or three spots, 

 and a slightly dusky, median shade at posterior margin. Surface 

 of body sparsely and finely tubercled. Antennae short, scarcely 

 as long as the head is wide posteriorly; joint i stoutest, about 

 as long as wide and of about equal thickness. The second but 

 faintly longer than wide, rounded and a little stoutest at apex. 

 Both joints are distinctly scaly and annulated. The third joint is 

 of about equal thickness throughout, with the upper sensorial 

 membrane very long, occupying two-thirds or more of the joint, 

 the lower one being entirely wanting. The upper two-thirds of 

 the joint, or more, is quite coarsely scaly and the lower part 

 divided by about ten annulations ; the apex is blunt and provided 

 with one hair at tip and two others a little below it. Legs rather 

 slender, the tibiae annulated and the terminal pair of capitate hairs 

 longer than usual, and the knob more distinct. The body ends, 

 above, in a stout and prominent conical anal projection which is 

 not uncommon in other Aphididse, but is not ordinarily con- 

 spicuous in Phylloxeridae. The ^'ulva is also very prominent, 

 expanding trumpet-fashion, and with its external surface closely 

 and beautifully striated. Wings large, pale, though yvith a dusky 

 hue and with their surface densely scaly ; stigma, subcosta and 

 veins dusky, the latter shaded. Venation normal, though the 

 stigmal branch reaches seldom to the stigma, but fades away some 

 distance before it. 



The winged form approaches quite closely that of Pk. foveola, 

 more particularly in the antennae, the third joint of which in that 

 species is also quite uniform in diameter. The absence of the 

 lower antennal sensorium, the more slender form, and the differ- 

 ences in the stem-mother and the gall, aH serve to separate the two 

 forms. 



Phylloxera deplanata Pergande, n. sp. 



PI. III., figs. 18-20; PL IV., figs. 21-23; PL X., figs. 66-70. 



The galls of this species and their architects were carefully 

 studied in 1883 on some small trees of Uicoriu totnentosa growing 

 on a hilly slope, bordering the Potomac River, opposite George- 

 town, D. C. An interesting fact connected with the species was 



[Proc. D, a. S., Vol. IX.l 25 [Sept. 28, 1903.] 



