96 NYSSONIDE. 
Genus XVII. Astata. Latr. 
Heap large, transverse, compressed, a little wider than the 
thorax ; the face covered in the g with a long silvery grey 
pubescence ; eyes large, oval, converging at the vertex in the 
Q, united inthe ¢ ; stemmata forming an equilateral triangle 
placed low towards the face, and at the angle formed by the 
union of the eyes in the ¢, in which sex they are very closely 
approximated, and the anterior stemma nearly as large as the 
posterior two united; the antenne filiform, inserted at the 
base of the clypeus, arcuate in the 9, porrect in the ¢, the 
first joint thick, obconic, the second very small, the third the 
longest of all, cylindrical, as well as the remainder, which regu- 
larly decrease in length; the clypeus transverse, short, slightly 
reflexed and truncate in front, convex in the centre, and de- 
pressed on each side; labrum concealed; mandibles slightly 
arcuate, bidentate, with a superior canal running longitudinally 
and dividing the teeth throughout its whole course, the inner 
tooth obtuse, the apical one more acute. The THoRAx ovate; 
the collar transverse, slightly advanced in front in the form of 
aneck; the metathorax truncated ; the superior wings nith one 
marginal cell, narrow, short, and appendiculated ; and three sub- 
marginal cells—the first narrow, longitudinal, divided obliquely 
about its centre by an obsolete nervure that runs from the base of 
_ the stigma to the middle of the first transverso-cubital—the second 
submarginal cell triangular, and receiving both the recurrent 
nervures—the third very distant from the apex of the wing ; 
the inferior wings very broad, and of considerable expansion 
in the g ; the Jegs moderately long, very spinose in the 9, 
particularly the two posterior pairs, less so in the g 3; the 
anterior tarsi strongly ciliated on the exterior inthe 9, the 
intermediate and posterior pairs also strongly spined, as well 
as the plantze above and all the joints on each side below. 
The aBpomeEN subsessile, somewhat conical, the upper surface 
much flattened in the ¢, its base concavo-truncate, and viewed 
from above forming an equilateral triangle; the margins of 
