6 INSECUTOR INSCITI^E MENSTRUUS 



tinctly shorter than prothorax, widest midway between eyes 

 and base, cheeks gently rounded ; surface with a few minute 

 spines, impressed and transversely rugose in front of anterior 

 ocellus, smooth between ocelli, and with four or five anasto- 

 mozing striae on occiput; frontal costa with deep, U-shaped 

 emargination ; ocellar area not at all delimited by chitinous 

 lines. Eyes setose, about 0.63 as long as head, about as wide as 

 their dorsal interval, not bounded behind by a chitinous line. 

 Ocelli of posterior pair twice the diameter of anterior ocellus, 

 a little less than half as wide as their interval. Antennas about 

 2.5 times as long as head ; segment 3 very slender, subconical, 

 about three times as long as greatest width, with deep incisions 

 at basal sixth and third ; 4 about half as wide as long, roundly 

 tapering to base ; 5-8 more or less barrel-shaped, with sense 

 cones; 9 about 2.5 times as long as wide, narrowed to apex; 

 segments 1 and 2 nearly concolorous with head ; 3 grayish 

 yellow ; 4 blackish brown, paler apically and just basal to 

 middle ; remainder of antenna blackish brown. 



Prothorax about 1.2 times as long as head and about 1.6 

 times as wide as long, sides and posterior margin rounded, 

 anterior margin straight; notum with numerous short, dis- 

 tinct spines, its entire surface with anastomozing lines which 

 are heavier and more transverse toward anterior and posterior 

 margins, particularly the latter. Wings of fore pair about 

 half as wide at middle as near base, the greatest subbasal 

 width (exclusive of scale), about one-ninth the length of 

 wing; costal margin, anterior vein, and posterior vein with 

 about 31, 27, and 23 short, stout spines, respectively, though 

 this character is highly variable. 



Abdomen stout; pubescence disposed on faint anastomoz- 

 ing lines, much more numerous than in flavicornis, which is 

 shown in figure 3, Plate I ; posterior margins of abdominal 

 tergites 1-7 fringed at sides with contiguous, chitinous scales 

 or plates, whose apical margins are evenly produced in long, 

 slender spines, giving a comb-like appearance; segment 1 un- 

 armed on middle portion of posterior margin; segments 2-5 

 with a few slender spines at middle of posterior margin; 6 

 and 7 with a regular fringe of similar spines between the lat- 



