HETARINA. 19 
Subfam. CALOPTERY GINA. 
Key to the Genera of the present faunal district. 
§ 1. Lower sector of the arculus arising from near the middle of the 
latter, upper sector arising farther forward. 
Antecubitals (or antenodals) in the costal and subcostal spaces ap- 
proximately equal in number. Quadrilateral approximately 
equal in length to the median space or much longer. . . . . Loion CaLopreryx. 
Median space with cross-veins, arculus not bent ; pterostigma, when 
present, of one cell only; males with the front wings having 
the postcostal space of more than two rows of cells and a red 
basal spot in all the species of this fauna. . . . . . . - Genus HETzARINA. 
Median space free, arculus bent where its sectors arise ; pterostigma, 
when present, of more than one cell; first antennal jomt much 
shorter than the second . . . . ~~. ~~ + + + + + Genus CaLopreryx. 
Antecubitals in the costal space at least twice as numerous as those in 
the subcostal space. Quadrilateral much shorter than the median 
space 2. ee ee Lecion AMPHIPTERYX. 
Quadrilateral free, postcostal cross-veins beginning before the apex 
of the quadrilateral, some postcubitals between the pterostigma 
and the costa. . . ~ oe . Genus AMPHIPTERYX *, 
§ 2. Lower and upper sectors of the arculus arising together from ‘the 
upper end of the latter © . 2. ee e ee . . . . Legion THore. 
Median sector unbranched, no supplementary sectors between the 
short sector and the superior sector of the triangle +, only one 
antecubital distinctly thicker than the others . . . . . . ~ Genus Cora. 
HETAERINA. 
Heterina, Selys, Syn. Calopt. p. 30 (1853) ; Monogr. Calopt. p. 96 (1854) *; Kirby, Cat. Odon. 
p- 104 (1890). 
For some years it has been known that the division of the species of Heterina into 
two primary groups, based on the absence or the presence of a pterostigma!, is 
untenable, since a number of species have been found to vary from the one condition 
to the other, each within its own specific limits. The subordinate divisions depending 
on the presence or absence of red or brown spots on the tips of the wings of the males 
are also unsatisfactory, since, even in those species in which such spots are present, 
* Baron de Selys gave [Bull. Acad. Belg. (2) vii. p. 450 (1859)] as a character separating Amphipteryx 
from Dinewra (=Diphlebia) that the former had no supplementary sectors between the short sector and the 
superior sector of the triangle. The present material of Amphipteryx does not sustain this statement, owing 
to the considerable percentage of individuals in which such supplementary sectors exist. 
+ This character, which distinguishes Cora from the genus Thore, is subject to exception in 5°5 per cent. of 
the present material of Cora marina (specimens from San Gerénimo), but otherwise it seems good. 
d 2 
