PERGANDE NORTH AMERICAN PHYLLOXERINiE. 221 



female of c.-scissa, are also larger and darker, with the antennae 

 much longer and more slender, particularly in the winged form. 



The transverse diameter of this gall ranges from 8-14™™- and 

 and the height from 2-5™™- or more. It is about equally convex 

 on both sides, though sometimes more prominent either above or 

 beneath, and often with a slight, central, nipple-like projection 

 above. The surface on both sides is more or less distinctly cov- 

 ered with short, fine, yellowish hairs when upon Hicoria tomen- 

 tosa; while upon H. alba it is smooth above and but slightly hairy 

 beneath. The gall is always situated between two of the trans- 

 verse veins, with the slit either parallel with them or slightly 

 oblique. When young, this slit is slightly closed and not easily 

 seen, but forms regular, shallow lips, densely pubescent, when 

 older. Color above and beneath pale greenish or dirty yellowish- 

 green. 



The winged female may be found from the middle of May to 

 the middle of June. 



Stem-mother. — I^ength 1-2™"-; diameter across the thorax 

 0.8™™-. Shape broadly ovoid. Color pale yellow; antennae and 

 legs faintly dusky; eyes purplishrbrown. There are two deep 

 black punctures on the front of the head and two smaller and 

 somewhat oval spots at its posterior edge. A somewhat angu- 

 lated, dusky, subdorsal spot each side on the prothorax ; a larger, 

 transverse spot each side in the first suture, and a smaller one 

 each side in the two following thoracic sutures; also, a lateral 

 row of three spots : the first is placed in the last thoracic suture 

 and the others in the sutures of the first two abdominal segments. 

 Granulation of body extremely minute and sparse. Antennae 

 and legs slender. First joint of antennae stoutest; joint two 

 considerably longer than wide and of almost uniform diameter, 

 rounded at tip; joint three very slender, of almost uniform diam- 

 eter, slightly stoutest at the apical one-third and quite coarsely 

 but rather sparsely annulate. 



Eggs white, regularly ovoid, highly polished and apparently 

 without sculpturing. 



I^ARVA and youngest pupae white or faintly yellowish, the eyes 

 red ; the legs and antennae slender ; the whole body densely cov- 

 ered with distinct granules. 



[Proc. D. A. S., Vol. IX.] '-1 I Oct. 26, 1903.] 



