118 Proceedings of the Biological Society of Washington. 



gray spot at extreme tip of wing; fore wing abont ten times as long as 

 width at middle and about 1.36 times as wide just beyond scale as at 

 middle; costal margin, anterior vein, and posterior vein with 24, 16, and 

 15 bristles, respectively, those of the anterior vein distributed evenly in 

 basal two-thirds, except for two close to apex of wing, those of posterior 

 vein equidistant, beginning at the fork. Legs stout; fore tibia with a 

 long hook on lower outer surface of apex, and with a calcar on lower 

 inner surface. 



Abdomen moderately stout, smooth, broader than pterothorax; pos- 

 terior margin of segment 8 with a broad median gap in the comb-like 

 fringe of spines; segment 10 not divided above, though irregularly 

 weakened along median line. 



Measurements of holotype: Length 1.30 mm. ; head, length 0.126 mm., 

 width 0.161 mm. ; prothorax, length 0.164 mm., width 0.224 mm. ; ptero- 

 thorax, width 0.300 mm. ; fore wing, length 0.876 mm., width at base 

 0.090 mm., at middle 0.066 mm. ; abdomen, width 0.358 mm. 



Antennal segments: 1 2 



Length (m) 33 46 



Width (M) 34 29 



Total length of antenna, 0.296 mm. 



Described from one female taken in a flower of Azalea nudiflora L., at 

 Great Falls, Virginia, May 19, 1915, by W. L. McAfee. 



The coloration of the wings and antennae, and the mode of attachment 

 of the sense-cone on the inner surface of the sixth antennal segment, 

 separate this species quite sharply from its congeners. For the oppor- 

 tunity of comparing it with the described European forms, I must ex- 

 press my obligation to Mr. C. B. AVilliams. 



Pseudothrips spadix sp. nov. 



Female (macropterous). — Length about 1.4 mm. Color hazel-brown; 

 legs yellow, shaded with brown; .segment 3 of antennae gray-yellow, 4-6 

 successively darker. 



Head about 1.3 times as wide as long, slightly broadest across eyes, 

 sides nearly straight, converging somewhat to base; vertex depressed; 

 frontal costa narrow, not emarginate; occiput with a few anastomozing 

 lines; interocellar bristles very long, half the length of head; a pair of 

 approximate minute bristles in front of anterior ocellus and a similar 

 pair near inner margin of eyes; postocular bristles minute, subequal. 

 Eyes about two-thirds the length of head, distinctly narrower than their 

 interval. Ocelli nearly equidistant, subequal in size, posterior pair 

 slightly behind middle of eyes; pigment brick-red. Antennae 9-segmented, 

 2.5 times as long as head, slender; segment 1 short, about as wide as 

 long; 2 about 1.7 times as long as wide and 1.4 times the length of 1; 3 

 and 4 long and slender, about three times as long as wide, pedicellate, 

 constricted at apex, with forked sense-cones; 5 slightly narrower than 

 either 4 or 6, about 2.6 times as long as wide; 6-9 closely united, together 

 nearly 1.2 times the length of 3; segments 1 and 2 concolorous with head; 



