1925] 
New N eotropical Thysanoptera 
63 
paler; legs concolorous with body. Head about 1.9 times as 
long as wide, as broad across eyes as at middle, narrowed to base, 
with a pair of long, stout bristles at basal two-fifths of cheeks. 
Prothorax about 0.4 as long as head, anterior margin deeply 
roundly emarginate, posterior margin perfectly straight; bristles 
at anterior angles dilated apically, very short, shorter than those 
at posterior two-fifths of cheeks; one pair of bristles at posterior 
angles, four times as long as those at anterior angles and dilated 
apically: all other bristles wanting. Fore wings with about 35 
accessory hairs on posterior margin; outer subbasal bristle long 
and pointed, others shorter, dilated at tip. Fore femora with 
two subapical teeth on inner surface, the basal one largest and 
triangular, and followed by a row of about eight smaller, spiniferous 
tubercles, of which the basal is decidedly the largest; fore tibiae 
with a row of 7 or 8 strong teeth along inner surface, the apical 
one longest, the others successively shorter; fore tarsus with a 
longer, stout, straight tooth. Tube three-fourths as long as head, 
fully 2.5 times as long as basal width, which is more than twice 
the apical. 
Trinidad; C. B. Williams; on cacao. 
The more distal of the two subapical teeth on the inner 
surface of the fore femur could easily be overlooked in a dark 
specimen, or one in which the femur is not in just the right 
position. 
Neurothrips williams! sp. nov. 
Female (macropterous). — Length about 1.9 mm. Very 
close to N. magnafemoralis (Hinds) in general structure and in 
color, but without the femoral tooth of that species. Tube one- 
half as long as head, uniform blackish brown; segment 9 of 
abdomen pale brown. 
Panama; C. B. Williams; on faggots. 
Macrophthalmothrips williams! sp. nov. 
Female (macropterous).— -Length about 1.4 mm. Color 
yellowish white, with the space between eyes, and abdominal 
