82 Proceedings of the Biological Society of Washington. 



Podothrips xanthopus, sp. nov. 



Female (macropterous) . — Length about 1.5 mm. Surface shining. Color 

 dark blackish brown, with apex of fore femora, all tibiae and tarsi, abdomi- 

 nal segments 1-4, and antenna? beyond basal half of segment 2, yellow; seg- 

 ment 8 of antenna? shaded with gray; abdominal segments 5 and 6 yellowish 

 brown, and, together with 3 and 4, each with a dark brown spot on dorsal 

 surface near base; wings of both pairs light gray. 



Head about 1.5 times as long as wide, broadest slightly behind eyes, 

 thence narrowing roundly and abruptly to base, where there is a slight neck- 

 like constriction; vertex rounded and evenly declivous; dorsal surface with- 

 out sculpture; cheeks smooth, sparsely and briefly spinose; postocular 

 bristles knobbed, half as long as eyes, situated close to lateral margins of 

 head. Eyes one-third as long as head and a little more than half as wide as 

 their interval, not protruding, ventral extent less than dorsal. Ocelli 

 anterior in position, the median one situated anterior to front margin of 

 eyes and between basal segments of antennae, the posterior pair situated 

 about half their diameter in front of a line drawn through middle of eyes. 

 Antenna? of normal form, nearly 1.5 times as long as head; sense cones and 

 bristles short and weak. Mouth cone blunt, broadly rounded, much shorter 

 than its width at base. 



Prothorax three-fourths as long as head and (inclusive of coxa?) twice as 

 wide near base as at apex and two-thirds as long as wide ; lateral outline dis- 

 tinctly concave; surface smooth; median dorsal line chitinized for about 

 one-third its length; all usual bristles present, the anterior marginal and 

 mid-lateral pairs pointed, visible only under the highest magnifications; the 

 two pairs near the posterior angles and the coxal pair knobbed, subequal to 

 postoculars; anterior angulars similarly knobbed, but only half as long. 

 Pterothorax much narrower than prothorax, sides nearly straight and very 

 slightly converging posteriorly. Legs rather short and stout; fore femur 

 much shorter than and only half as wide as head; fore tibia with a small, 

 blunt, setose tooth on inner surface of apex; fore tarsus with a slender, acute, 

 curved tooth about half as long as width of tarsus, the inner surface of tooth 

 with a bristle arising from near middle. Wings slender, weak, without 

 double subapical fringe. 



Abdomen slender, about as wide as prothorax. Tube about 0.5 as long as 

 head, basal fourth slightly swollen and twice as wide as apex; bristles pale, 

 mostly knobbed. 



Measurements of holotype (9): Length 1.5 mm.; head, length 0.228 

 mm , greatest width 0.156 mm., least width 0.118 mm.; eyes, length 0.072 

 mm., width 0.039 mm., interval 0.069 mm ; postocular bristles, length 

 0.036 mm.; prothorax, length 0.172 mm., width (inclusive of coxa?) 0.259 

 mm.; pterothorax, length 0.288 mm., width 0.228 mm.; abdomen, greatest 

 width 0.252 mm.; tube, length 0.120 mm., width at base 0.056 mm., at apex 

 0.029 mm. 



Antennal segments: 12 3 4 5 6 

 Length (m) 35 47 45 48 43 43 



Width (m) 34 28 26 28 25 22 



Total length of antenna, 0.337 mm. 



