33 
A. Three pairs of lateral spines, all well-developed; eyes 
occupying at least two thirds of the side margin of the 
head; scale of male on base of superior appendage short 
and broad, emarginate at apex; apical emargination of 
superior appendage about as in /2’schna. VI. Anaz. 
I. Nastascuna Selys. 
The single species which follows has until recently re- 
mained in the genus schna, but it is very evidently gener- 
ically distinct from all other American /F’schnide, and has, in 
fact, been lately so recognized by Selys-Longchamps and Fors- 
ter under the name of Nasiwschna.* It has been referred by 
Hagen (’77, p.37) to Brachytron Evans, but it is intermediate be- 
tween that and Kpieschna Hagen. Aside from secondary sexual 
characters, it is nearer the latter genus. The following char- 
acters sufficiently distinguish the imago from related genera: 
Face concave; frons narrow, produced above into a shelf- 
like prominence, with a broad longitudinal superior furrow, and 
without “T” spot. Radial (subnodal) sector forked midway 
between the nodus and the middle of the stigma, the branches 
of the fork diverging all the way to the wing-margin ; first and 
second branches of media (principal and nodal sectors) not ap- 
proximated beyond the fork of the radial sector; apical sector 
originating near the anterior end of the stigma; anal loop oval, 
lying nearly lengthwise of the wing, with about two longitudi- 
nal rows of cells, usually one cell between bases of the 2d and 
3d anals; supratriangular space with two or three cross-veins, 
triangles 3- or 4-celled, inner side not receiving a. cross-vein. 
Inferior abdominal appendage of male hardly shorter than 
superiors. 
Epieschna debilis Karsch (Ent. Nachr., Vol. XVII, p. 286) 
perhaps belongs to this genus. 
The nymph of Nasieschna differs from all other vschnids 
in the possession of dorsal hooks. Our species represents a dis- 
tinct and primary step in the evolution of the A’schnidw, and 
its claim to generic distinction is beyond question. 
*See “Ent, News,’’ Vol. XI., p. 546. 
