INSECUTOR INSCITI^ MENSTRUUS 97 



surface smooth ; all usual bristles present, dilated at tip, and 

 stouter than postoculars, the two pairs on anterior margin 

 shortest. Wings distinctly narrowed at middle, nearly color- 

 less ; subbasal bristles equal in length, the two basal ones di- 

 lated at tip ; six or seven accessory hairs on posterior margin. 

 Tarsal tooth short, stout, and basal in position. 



Abdomen only slightly wider than pterothorax and almost 

 without sculpture ; tergites 3-7 at extreme lateral margins 

 with from five to seven pairs of small, stout spines, in addi- 

 tion to the usual one of two pairs of sigmoid bristles and the 

 long straight one near posterior angles. Tube nearly twice 

 as long as basal width and twice as wide at base as at apex, 

 sides slightly convex. Lateral bristles on segments 3-8 short, 

 blunt ; terminal bristles slightly longer than tube, brown. 



Measurements of holotype (female): Length L31 mm.; 

 head, length 0.101 mm., width O.lSfi mm.; eyes, length 0.066 

 mm., width 0.048 mm., interval 0.048 mm. ; postocular bristles, 

 length 0.048 mm.; prothorax, length 0.151 mm., width (in- 

 clusive of coxae) 0.283 mm. ; pterothorax, width 0.330 mm. ; 

 abdomen, greatest width 0.336 mm. ; tube, length 0.120 mm., 

 width at base 0.068 mm., at apex 0.033 mm. 

 Antennal segments : 12 3 4 



Length {\i) 33 44 46 44 



Width (n) 28 28 28 28 



Total length of antenna, 0.309 mm. 



Male {macro pterous). — Length about 1.4 mm. 

 structure essentially as in female, except as follows : Eyes 

 slightly larger, about 0.36 as long as head. Antennae about 

 1.73 times as long as head. Prothorax nearly 0.9 as long as 

 head ; anterior marginal bristles sometimes minute and pointed. 

 Tarsal tooth large, stout, and triangular. Abdomen more 

 slender. 



Measurements of allotype (male) : Length 1.39 mm.; head, 

 length 0.192 mm., width 0.155 mm.; eyes, length 0.072 mm., 

 width 0.045 mm., interval 0.054 mm. ; postocular bristles, length 

 0.057 mm.; prothorax, length 0.168 mm., width (inclusive of 

 coxae) 0.322 mm.; pterothorax, width 0.336 mm.; abdomen, 



