1916] Hood — Two Neu' Thi/sanopfera from West Africa 9 



long hooked tooth. Wings slender, narrowed at middle; fringe sparse and weak, on 

 fore wing not double along posterior margin near apex. 

 Type: Podothrips semiflavus Hood. 



The new African species described below has made necessary 

 two or three sUght changes in the original description of the 

 genus. The two known species are strictly congeneric, though 

 differing abruptly in color and certain details of structure. 



Key to Species. 

 a. Yellow, with head, sides of metathorax, and last three abdominal segments 

 abruptly dark brown; cheeks rounded behind eyes, not toothed 



Podothrips semiflavus Hood. 



aa. Dark blackish brown, with antennal segments 3-7, the fore tibise, all tarsi, 



and first abdominal segment yellow; cheeks with a distinct, lateral, acute 



tooth behind eyes Podothrips denticeps Hood. 



Podothrips denticeps sp. nov. 



Female: Length about 1.8 mm. Surface shining. Color dark blackish brown, 

 with antennal segments 3-7, fore tibife, all tarsi, and first abdominal segment, pale 

 lemon yellow; wings pale yellowish, darker toward base. 



Head 1.35 times as long as wide, with a distinct, lateral, acute, and more or less 

 forwardly directed tooth just behind eye, thence arcuately converging to near base, 

 where there is a slight neck-like constriction; vertex rounded and evenly declivous; 

 dorsal surface without sculpture; cheeks very slightly roughened, sparsely and 

 briefly spinose; postocular bristles slightly knobbed, two-thirds as long as eyes, 

 situated close to lateral margins of head. Eyes one-third as long as head and three- 

 fourths as wide as their interval, not protruding, ventral extent very slightly less than 

 dorsal. Ocelli anterior in position, the posterior pair near the anterior angle of eyes, 

 the median ocellus between basal segments of antennae. Antennse nearly 1.5 times 

 as long as head, moderately slender; segment 1 slightly broader at base than ventral 

 length; 2 narrower than 1, nearly twice as long as wide; 3 elongate-oval, pedicellate, 

 with a slight notch on inner surface at basal third, nearly twice as long as wide; 4-6 

 elongate-oval, subequal in length and successively decreasing in width, briefly 

 pedicellate, 4 slightly broader than 2 and 3; 7 slender, very slightly longer than 6, 

 about 2.4 times as long as wide; 8 fusiform-truncate, very slender and nearly 0.9 as 

 long as 7, about four times as long as greatest width; sense cones and bristles un- 

 usually short and weak; segments 1, 2, and 8 nearly concolorous with head, 2 yellow 

 in outer apical half; intermediate segments clear lemon yellow, except 7, which is 

 lightly washed- with brown. 



Frothorax about five-sixths as long as head and (inclusive of coxae) twice as wide 

 at base as at apex and 0.7 as long as wide; lateral outline concave; surface smooth; 

 median dorsal line distinctly chitinized; all usual bristles present, the anterior mar- 

 ginal pair visible only under highest magnifications; the anterior angular and mid- 

 lateral pairs only slightly larger; the two pairs near the posterior angles and the 

 coxal pair knobbed, nearly as long as postoculars. Pcerothorax about as wide as 



