114 Proceedings of the Biological Society of Washington. 



behind, the sides straight; coxae dark brown, femora and tibiae with a 

 large brown blotcii on outer surface at mi,ddle ; pronotum with close, 

 raised, transverse, anastomozing lines, and very minutely roughened be- 

 tween them, the sculpture slightly closer on the median blotch; bristles 

 normal to the genus. Pterothorax dark blackish brown, with a pale 

 yellowish girdle just behind middle coxie; mesoscutum more closely 

 striate than pronotum, the lines converging to three points on posterior 

 margin ; metascutum closely, longitudinally striate. Fore wings brown 

 at extreme base, then with a white transverse band, the remainder of 

 wing brownish gray, paler at middle and again at apex; nearly twice as 

 wide just beyond scale as at middle, the greatest subbasal width (ex- 

 clusive of scale) about one-tenth the length of wing; costal margin with 

 about 28 equidistant bristles, anterior vein with about 24, and posterior 

 vein with two widely separated ones near apex of wing. Middle and 

 hind legs pale yellow in ground color, broadly marked with dark brown 

 around middle of femora and along outer surface of tibiae, coxae dark 

 brown . 



Abdomen stout, about 1.6 times the width of prothorax ; general color 

 brownish yellow, darker toward base, with segments 7-10 dark brown ; 

 a black line extends across base of tergites 2-7 whicli are marked near 

 base with three pairs of minute black dots (tergite 2 has only the inner 

 two pairs), the inner two pairs approximate and just lateral to the 

 median third ; sternites 3-6 with two pairs of approximate similar dots at 

 margins of median third ; pubescence close and distinct, absent only from 

 most of median third of tergite 1 and from apical half of median third of 

 tergites 2-6 ; segment 10 divided above in apical two-fifths ; bristles normal 

 to the genus. 



Measurements of holotype: Length 0.924 nnn. ; head, length 0.110 

 mm., length to collar 0.073 mm., width 0.165 mm.; prothorax, length 

 0.124 mm., width 0.216 mm. ; pterothorax, width 0.276 mm. ; fore wing, 

 length 0.792 mm., width near base 0.078 mm., at middle 0.045 mm.; 

 abdomen, width 0.360 mm. 



Antennal segments: 1 2 



Length (m) 21 37 



Width (m) 27 29 



Total length of antenna, 0.263 mm. 



Male (macropterous). — Length about 0.7 mm. Color as in female ex- 

 cept that the tip of abdomen is brown only in segments 8-10, and that 

 segment 8 also is marked at base with a black transverse line and three 

 pairs of black dots. 



Measurements of allotype: Length 0.696 mm.; head, length to collar 

 0.055 mm., width 0.140 mm. ; prothorax, length 0.097 mm., width 0.190 

 mm.; pterothorax, width 0.216 mm. ; fore wing, length 0.612 mm., width 

 near base 0.057 mm., at middle 0.033 mm. ; abdomen, width 0.228mm. 



Antennal segments : 1 2 



Length (m) 17 32 



Width (m) 22 24 



Total length of antenna, 0.231 mm. 



