12 INSECUTOR INSCITI^ MENSTRUUS 



apex, fully one and one-half times as long as wide ; fore tarsi 

 nearly three times as long as wide. 



Abdomen broader than pterothorax, with transverse, anasto- 

 mozing striae; tergites with posterior margin deeply dentate; 

 tergite 1 with about six transverse rows of chitinous arcs in 

 basal three-fifths ; chitinous line at basal sixth of tergite 2 

 interrupted in several places near median line ; sternites 2 and 

 3 with the transverse striae interrupted to form dark chitinous 

 arcs ; on sternites 4-7 these coalesce to form normal transverse 

 striae. Segment 10 slightly longer than basal width, angulate 

 and pointed at apex, divided above. 



Measurements of holotype : Length 1.13 mm. ; head, length 

 0.109 mm., width 0.120 mm. ; prothorax, length 0.180 mm., 

 width 0.254 mm. ; pterothorax, width 0.304 mm. ; fore wing, 

 length 0.756 mm., width at base 0.072 mm., at middle 0.048 

 mm. ; abdomen, width 0.324 mm. 



Antennal segments 1 2 3 4 5 6 7 8 



Length (\i) 21 28 26 26 20 44 19 19 



Width (ja) 33 34 29 28 23 21 9 5 



Total length of antenna, 0.203 mm. 



Described from one female taken by sweeping at Four Mile 

 Run, Virginia, May 3, 1914, by Mr. W. L. McAtee. 



Remarkable for the form of the antennae and the long pro- 

 thoracic bristles. 



Chirothrips spiniceps, new species. (PI. I, fig. 8.) 



Female ( macro pterous). — Length about 1.1 mm. Usually 

 bicolored (brown and yellow) ; head and thorax yellowish to 

 blackish brown, the head and sides of pterothorax darker and 

 the latter often with reddish orange hypodermal pigment ; ab- 

 domen usually lemon yellow, though sometimes heavily shaded 

 with brown and nearly concolorous with head and thorax, 

 apex of segment 10 always black ; two or three basal segments 

 of antennae yellow; legs usually yellow, with basal half of 

 fore femora and outer surface of middle and hind legs shaded 

 more or less with gray, though sometimes nearly uniform 

 brown with only the tarsi, fore tibiae, and apex of fore femora 

 yellow. 



