LIBELLULIN A, 199 
CC. Nodal sector not waved in its middle, all triangles of the front and 
hind wings free, eyes in contact for a distance greater than the 
mid-dorsal length of occiput, subnodal sector and supplementary 
sector next below separated from each other by only one row of 
cells, proximal side of discoidal triangle of hind wings proximal 
to arculus, last antenodal of front wings not continued to median 
vein, one bridge-cross-veln . . . . . . e + © «© ~~ « |) Epurpatia. 
BB. Sectors of the arculus on the front and hind wings arising from a 
common stalk at least as long as the lower piece of the arculus. 
F. Discoidal triangle of hind wing cross-veined (except in the South- 
American U. siemensii and allies, recognizable by the discoidal 
triangle of the front wings directed markedly distad and caudad) ; 
females with the vulvar lamina (gonapophyses of segm. 8) and with 
genital valves (outer gonapophyses of segm. 9) all prolonged beyond 
the apex of the abdomen; eyes in contact for a distance less than the 
mid-dorsal length of occiput; no additiona] transverse carinz on 
abdominal segments 4 and 5, arculus distal to the second antenodal, 
one bridge-cross-vein, hind wing with two or more submedian cross- 
veins; front wing with the discoidal triangle cross-veined, the 
internal triangle 3—4-celled, the last antenodal not continued to | 
the median vein ; hind wing with the sectors of the triangle arising 
from the same point, the proximal side of the triangle more often 
distal to the arculus . . «2. . . 6 ee ee ee ee eh )6CU Rac. 
FF. Discoidal triangle of hind wing free (except in some Cannaphila), 
vulvar lamina of female not prolonged beyond the apex of the 
abdomen, supra-triangular cross-veins absent. 
G. Eyes in contact for about 2 mm., a distance longer than the mid- 
dorsal length of occiput ; females with homologues of genital 
valves, * not approximated to each other on their ventral edges 
but forming between them a trough whose margins are armed 
with a few stiff hairs ; abdominal segment 4 with one additional 
transverse carina, 5 with none; front wing with the last ante- 
nodal not continued to the median vein, discoidal and internal 
triangles cross-veined ; genital hamule of male unbranched . . THotymis. 
GG. Eyes in contact for a shorter distance, equal to or less than the 
mid-dorsal length of the occiput (except in some Nephepeltia and 
some Micrathyria easily recognized by the venational characters 
given below) ; females without homologues of genital valves. 
H. Bridge-cross-veins two (one subnodal, the other antenodal), 
sectors of the triangle on hind wing separated at origin, sub- 
* On renewed study I think that I should have added “‘ and Tholymis” after “ Uracis” on p. 196, anted, 
line 28, and omitted any mention of Palcosynthemis, line 29. I hope to give a discussion of these structures 
2a 2 
in another publication. 
