34 INSECUTOR INSCITI^ MENSTRUUS 



antennae brown at apex and the third segment clear yellow 

 tipped abruptly with black ; wings clear, both pairs with a 

 brown median streak in basal two-fifths. 



Head about 1.6 times as long as broad, widest across pos- 

 terior angles of eyes, narrowest at base, sides almost straight ; 

 vertex distinctly produced, the anterior ocellus prominently 

 borne at its tip and overhanging; dorsal and lateral surfaces 

 closely transversely striate and with a few minute spines; 

 postocular bristles longer than eyes, pointed; anteocular 

 bristles stout, three-fifths as long as eyes, postocellars one- 

 third as long as eyes. Eyes very large and prominent, on 

 dorsal surface about 0.3 as long as head and 1.3 times as 

 wide as their interval, inner margins sinuate and converging 

 posteriorly ; on ventral surface prolonged posteriorly fully 

 two-fifths of distance to base of mouth cone. Ocelli of pos- 

 terior pair set on a line through anterior half of eyes and 

 close to their margins. Antennae stout, nearly 1.7 times as 

 long as head, inserted very close together directly below pos- 

 terior ocelli ; segment 1 about cylindrical, about one and three- 

 fourths times as long as wide ; 2 a little more than twice as 

 long as wide ; 3 about 3.7 times as long as greatest width, 

 sides nearly straight, apex squarely truncate ; 4 about three 

 times as long as wide, base squarely truncate, apex truncate on 

 outer surface at an angle of about 45° ; 5 elongate- fusiform, 

 2.5 times as long as wide, inner surface of base and outer 

 surface of apex obliquely truncate; 6 similar in form to 5 

 but stouter, twice as long as wide; 7 twice as long as wide, 

 almost squarely truncate at base and apex; 8 about twice as 

 long as wide. 



Pro thorax half as long as head and (inclusive of coxae) 

 a little more than twice as wide as long ; all usual bristles pres- 

 ent, nearly pointed, the two pairs at the posterior angles much 

 the longest, the inner pair slightly longer than the outer and 

 about 0.8 as long as prothorax; midlaterals half as long; an- 

 terior angulars and anterior marginals successively shorter. 

 Wings clear, both pairs with a brown median streak in basal 

 two-fifths; fore pair with about 20 accessory hairs on pos- 

 terior margin. Tarsi unarmed. 



