72 INSECUTOR INSCITI^ MENSTRUUS 



tooth moderately long, acute, arising at an angle of about 45 

 degrees. 



Abdomen broadest at base, where it is distinctly narrower 

 than pterothorax, very long and slender, depressed and flat- 

 tened along lateral margins, tapering uniformly to tube, dorsal 

 surface (except at middle of basal segments) finely reticulate 

 and striate with anastomosing lines ; posterior angles of seg- 

 ments 2-7 very slightly produced. Tube bent upward, very 

 long and slender, about 1.87 times as long as head and nine 

 times as long as width at base, which is twice the width at 

 apex ; surface sparsely clothed with rather long slender bristles. 

 Bristles at posterior angles of segments 1-8 averaging about 

 equal in length to the longest prothoracic pair, colorless ; those 

 on segment 9 slightly shorter than terminal bristles, the latter 

 0.3 as long as tube, yellowish brown ; segments 2-5 each with 

 four or five pairs of sigmoid, wing-retaining bristles and nu- 

 merous minute straight bristles, situated close to lateral mar- 

 gins of segments ; segments 6-8 without sigmoid bristles but 

 with minute lateral bristles and, in addition, with two longi- 

 tudinal rows of small bristles along middle of dorsal surface. 



Measurements of holotype (female) : Length 4.15 mm. ; 

 head, length 0.438 mm., width across eyes 0.232 mm., width 

 behind eyes 0.210 mm., widtli near base 0.23G mm., width at 

 extreme base 0.222 mm. ; eyes, length 0.140 mm., width 0.083 

 mm., interval 0.0(58 mm. ; prothorax, length 0.223 mm., width 

 (inclusive of cox?e) 0.388 mm.; pterothorax, length 0.420 mm., 

 width 0.504 mm. ; abdomen, greatest width 0.432 mm., length 

 of segment 8, 0.312 mm., length of segment 9, 0.240 mm. ; tube, 

 length 0.816 mm., width at base 0.090 mm., at apex 0.045 mm. 

 Antennal segments: 12 3 4 5 6 7 8 



Length (Li) 65 (i3 207 147 141 130 74 57 



Width ([.i) 48 39 31 39 41 37 27 15 



Total length of antenna, 0.884 mm. 



Male (macropterous). — Length about 3.6 mm. Similar to 

 female in color and structure except as follows : 



Eyes about L24 times as wide as their interval. Fore 

 wings with about 18 accessory hairs on posterior margin. 



