MORGAN HEBARD 341 



Tegmina with numerous discoidal sectors; the portion of the dextral tegmen, 

 concealed when at rest, hyahne. .Sixth and seventh dorsal abdominal segments 

 greatly specialized as given in generic description; eighth segment the same 

 with distal margin briefly straight laterad and broadh- but rather decidedly 

 sinuato-concave mesad. Supra anal plate well produced; narrow lateral and 

 proximal marginal portions chitinous; remaining large mesal and distal por- 

 tion occupied by an ample, soft, whitish integument, its margin joining the 

 chitinous portions forming a large part of a "perfect circle, its distal margin 

 truncate; lateral chitinous portions not enlarged but rather broadlj^ rounded 

 distad, their apices supplied with a number of bristles. Cerci moderately 

 elongate, slender, tapering to acute apex, with twelve joints; dorsal surface 

 deplanate, ventral surface decidedly convex. Subgenital plate strongly 

 asymmetrical, produced, with rather broad produced portion concave, dextral 

 margin oblique produced to transverse distal margin of production, on this 

 latter margin is situated, decidedly sinistrad of the middle, the larger style, pro- 

 duced portion terminated rather suddenly at internal margin of sinistral cercus, 

 there rather sharply rounded rectangulate, forming with remaining brief 

 portion of sinistral margin, which is weakly oblique, nearly a rectangulate 

 emargination, at the apex of which is situated the smaller style; meso-distal 

 portion of plate internally moderately convex with surface thickly covered 

 with short bristles directed cephalad. The larger dextral style is four times 

 as long as bioad, with di.stal lialf slightly bent sinistrad and armed with 

 minute spines. 



Measurements {in millimeters) 



Caracas, Venezuela 17. S 4.9 7.1 22.1 5.5 7 



Coloration. — Eyes, pronotum and underparts blackish brown; 

 head, dorsal surface of abdomen and limbs very slightly paler. 

 Ocelli buffy. Dextral tegmen dark chestnut brown fading rather 

 abruptly at portion concealed when at rest, which is colorless 

 hyaline; sinistral tegmen dark chestnut brown, becoming slightly 

 paler distad. Wings and veins colorless hyaline, except area 

 of costal veins which is tawny olive, more buffy mesad. 



Specimens Examined: 1 ; 1 male. 



Caracas, Venezuela, (E. Hartert), Icf, [A. N. S. P.]. 



Ischnoptera atrata new species (Plate XVI, figs. 1 and 2.) 



Closely related to /. morio, bearing that species a close general 

 resemblance, but differing decidedly in the darkened veins of 



TRANS. AM. ENT. SOC, XLII. 



