34 GROTE—THE DESCENT OF THE PIERIDS. (Jan. 5, 
South American Archontias the costal vein of hind wings appears 
turned in the reverse position from De/zas, and to the base of the 
wing. The correspondence, however, in the position of the radial 
nervules, between Prccarda, Delias and Pereute is very great, but 
is probably owing in the latter case to convergence. That the first 
radial does not attain the margin, but fuses with the short second 
radial, isolates Pereute from any other type examined. 
Gen. Archonias Hiibn., 1816. 
Type: A. tereas. 
Syn. Luterpe Swainson, 1832. 
Archonias tereas. 
Wings ample. Radius four-branched ; “1 and #2 both moved 
forward, 2 opposite cross-vein ; #3 straight, a moderate furcation 
to apex. Cell closed, vein between J/2 and 4/3 medially degen- 
erate ; J/1 from radius about one-fifth distance to external margin 
from cross-vein. Hind wings with humeral spur turned backwards 
to base of wing ; Sc. appears to offer a line of cleavage ; cell closed, 
vein between 4/2 and 473 thinner, but nowhere degenerate. 
This genus and the following appear to represent the four- 
branched stage of the preceding Pereure. 
Gen. Cafasticta Butler, 1870. 
Type: C. nimbice. 
Catasticta nimbice. i 
The primaries are apically narrowed and produced, else this type 
agrees absolutely in neuration with that of Archontas, all the dif- 
ference I note is that the stem of J/1 is a little longer and that the 
discoidal vein, between J7/2 and radius, is quite even on the inner 
edge, losing the infinitesimal irregularity of Archonias. The pro- 
duced apices seem to necessitate the wider fork between #3 and 
R4-5, while 73 is a little curved. How far these very slight char- 
acters are generic I cannot say without a larger material to examine. 
We come now toa genus which shows affinities to the Antho- 
charids in the short terminal branches of the radius of fore wings, as 
well as in the truncated costal vein of secondaries, curving in one 
instance plainly to base of wing, and in the comparatively straight 
inner margin and determinate anal angle of the hind pair. 
