1927] 
New Neotropical Thysanoptera 
239 
the other fourteen species before me, and aids in giving the 
female a most decidedly male-like appearance when seen under a 
low-power objective. Other important differentiae are those 
italicized above. 
Hercothrips williamsi sp. nov. 
Female (macropterous) . — Length about 1.05 mm. Color 
dark brown (nearly black to the naked eye), darkest in ab- 
.dominal segments 5 and 6, head yellow between eyes, save for the 
ocellar area and a narrow brown line from it to the frontal costa; 
antennae with segment 1 brownish yellow; distal constriction of 
3, pedicel and distal constriction of 4, cmd all of 5 clear white, the 
intervening portions dark blackish brown; legs blackish brown, the 
mid and hind pairs darkest; tarsi and tips of tibiae yellow; fore 
wings dark brown, paler between veins and in a narrow trans- 
verse band just beyond scale, with a darker streak at base in 
front of longitudinal vein and a small, round, slightly elevated 
dark spot on the costal margin just beyond the pale subbasal band , 
this spot darker because covered with longer and heavier pubescence 
than the rest of the wing. Dorsal surface of head, thorax, and 
median portions of abdominal tergites 1 and 2 with conspicuous 
subequal polygonal reticulation, formed by raised black chitinous 
lines, not roughened between the lines of reticulation. Head 
broad, with a prominent lateral swelling at anterior end of cheeks, 
sides abruptly converging posteriorly to a transverse groove on 
each side which shallows dorsally and disappears before attaining 
the median line; ocellar area opposite center of eyes, slightly 
elevated but not at all produced nor overhanging, with a narrowly 
grooved ridge running from it downward to frontal costa. An- 
tennas separated by 1 .5 times width of segment 1 ; segments 3 and 4 
with a subglobose middle portion, pedicels slender, distal portions 
slender and much prolonged; forked trichomes on 3 and 4 ex- 
ceptionally long. Wings of fore pair with about 20 dark bristles 
on costal margin, averaging fully as long as width of wing and 
subequal in length to fringe; anterior vein with one similar 
bristle near fork and 3 in distal fourth of wing; posterior vein 
with about 8 equally spaced bristles; about four bristles on vein 
