166 Proceedings of the Biological Society of Washington. 



coxae) .276 mm.; pterothorax, width .336 mm.; abdomen, width 

 .372 mm.; tube, length .156 mm., width at base .063 mm., at apex 

 .038 mm. Antennal segments: 1, 27m; 2, 54m; 3, 63m; 4, 65; 5, 51m: 6, 

 53m; 7, 43m; 8, 37m; total length of antenna, .39 mm. ; width at segment 

 4, .036 mm. 



Female, forma brachyptera. — Apparently identical with the long winged 

 form, save for the absence of wings. 



Described from many females, taken in May and June on the bark of a 

 dying red-oak tree, Washington, D. ('., by H. E. Burke, J. R. Malloch, 

 and the writer. 



Thrips winnemanae sp. nov. 



Female. — Color dull stramineous; pterotborax lightly shaded witb 

 orange. Head one and one-fourtb times as wide as long; cheeks rounded; 

 eyes slightly protruding, half as wide as their interval. Antennae slender, 

 2.4 times as long as head; segment 3 about 3.3 times as long as wide; 

 segment 1 nearly white; 2 concolorous with head; 3 pale in basal half, 

 lightly shaded with grayish apically; 4 and 5 pale at base, dark brownish 

 gray beyond; <i and 7 dark brownish gray, the former sometimes pale rft 

 extreme base. Prothorax about 1.1 times as long as head and about 1.5 

 times as wide as long; two long bristles at posterior angles nearly black. 

 and between them only two pairs of smaller ones, of which the outer is 

 pale and almost invisible, the inner long, prominent, nearly black; two 

 pairs of similar dark colored bristles near anterior angles, and one at 

 middle of lateral margins; disk sparsely spinose. Legs uniform strami- 

 neous. Wings of fore pair very lightly shaded with gray; principal vein 

 with three long, nearly equidistant bristles in apical half. 



Measurements of holotype. — Length LIS mm.; head, length .124 mm., 

 width .156 mm.; prothorax, length .139 mm., width .209 mm. ; meso- 

 thorax, width .270 mm.; abdomen, width .300mm. Antennal "segments : 

 1, 27m; 2,42m; ■">, ''><»m; 4, 51m; 5, 45m; <>, 57m; 7, 21m; total length of 

 antenna, .300 mm., width at segment 4, .01 S mm. 



Described from two females taken in a flower of Hydrophyllum virgini- 

 cum, Plummer's Island, Maryland, May 19, 1012, by W. L. McAfee and 

 the writer. 



Named for the type locality, supposed to have been known to the 

 Indians as Winnemana. 



