1927] 
New Neotropical Thysanoptera 
237 
0.585 mm., width at middle 0.045 mm., near base 0.061 mm.; 
abdomen, width 0.236 mm. 
Antennal segments: 12345678 
Length GO 17 34 43 37 30 23 10 23 
Width GO 23 28 21 21 18 16 7 4 
Total length of antenna 0 . 22 mm. 
Described from 18 females from Trinidad and Tobago, 
British West Indies, taken by F. W. Urich and C. B. Williams, 
respectively, principally on a wild vine belonging to the genus 
Couania. 
Very close to phaseoli, but the smaller size and the italicized 
characters will separate them readily. 
Hercothrips masculinus sp. nov. 
Female (macropterous) . — Length about 1 mm. Color uni- 
form gray brown, ocellar pigment dull orange yellow by trans- 
mitted light, lemon yellow by reflected light; antennae largely 
brown and nearly concolorous with body, segment 1 paler, 2 
dark blackish brown; 3 with stem white, globose portion and 
apex gray brown; 4 with brief pedicel nearly white, remainder 
dark blackish brown, but paler basally; 5 clear white except for 
a slight brownish cloud at extreme apex; 6-8 dark blackish 
brown; legs largely brown, knees, tarsi, and most of fore tibiae 
pale yellow; fore wings dark gray brown, with a narrow white band 
just beyond scale and another in eighth tenth, a few darker streaks 
at base and a small slightly elevated dark spot on the costal 
margin just beyond the pale subbasal band, this spot darker be- 
cause covered with longer and heavier pubescence than the rest 
of wing, all veins darker, especially the ambient vein at tip of 
wing, scale paler. Dorsal surface of head and thorax, lateral 
thirds of abdominal tergites 1-8, and a narrow median portion of 
tergites 1 and 2, with dark polygonal reticulation, surface rough- 
ened within the reticles. Head broad, without occipital line or 
neck-like constriction, cheeks nearly straight but somewhat con- 
verging posteriorly, rectangularly narrowed to eyes; ocellar area 
opposite center of eyes, slightly elevated but not produced no 
