1927] 
New Neotrapical Thysanoptera 
231 
conspicuously slender, segment 3 about 3.5, and 4 nearly four, 
times as long as wide, 8 hardly four times as long as wide. 
Antennal segments : 12345678 
Length GO 24 36 67 60 51 54 11 15 
Width GO 27 26 19 16 15 15 6 4 
Total length of antenna 0 . 32 mm. 
Described from one female taken by Mr. C. B. Williams 
March 9, 1915, on the island of St. Croix, then Dutch, now 
American, West Indies. It was found in sweepings from grass. 
Aside from the differences in coloration, which are con- 
spicuous, this species may be known from tricinctus, undoubtedly 
its closest relative, by the very much longer and more acute 
mouth cone. 
Sericothrips tricinctus sp. nov. 
Female (macropterous ) . — Length about 1.0 mm. Color pale 
yellow, with ocellar area, anterior half of pterothorax, and ab- 
dominal segments 2, 3, and 7 abruptly dark blackish brown; 
segment 8 of abdomen pale brown; pronotum without trace of 
dark blotch; antennae with segments 1-3 nearly white, 3 grayish 
apically; 4-8 dark gray, with pedicel of 4 pale; legs pale yellow, 
hind femora and usually mid femora lightly brown at apex; fore 
wings brown at extreme base and in scale, nearly white in re- 
mainder of basal fourth, dark gray beyond, fading to white at 
tip. Mouth cone moderate in length, hardly attaining base of 
prosternum. Antennae very long and slender, segment 3 about 
3.5 times as long as wide, and 8 more than four times as long as 
wide. 
Antennal segments: 12345678 
Length ( M ) 24 36 60 58 50 59 14 17 
Width ( M ) 28 28 17 17 16 16 6 4 
Total length of antenna 0.32 mm. 
Described from several females collected by C. B. Williams 
in Martinique (type locality), Dominica, Guadeloupe, and Trini- 
