— 19 — 
in the generic sense, no distinguishing features can be derived from 
the external appearance of the different species. I am speaking of the 
palaearctic species of the genus Zethes. 
This genus, as understood at the present time, consists of four 
species inhabiting the palaearctic region and a rather large number of 
exotic species. These latter could not be taken into consideration for 
lack of material, and going to separate a certain group under a new 
generic name I am placed into the rather awkward position in so doing 
without having examined at least the types of Guénée's and Wal- 
ker’s genera included by Hampson in Rambur' genus Zethes. 
But all exotic species are comparatively small-sized and broad-winged, 
so they are nearer to the insularis-, than the musculus-group, though 
I cannot tell for certain that the new name I am going to give to the 
latter group is going to maintain validity. Anyhow, separating the 
palaearctic species into two genera I must give the generic characte- 
ristics, which are to be attached to some type and as such I can only 
choose species examined by myself. 
Let us now proceed to the comparison of the two groups. 
1) insularis and propinquus. 2) musculus and subfalcata. 
Male genital apparatus. 
uncus — short, but stout and well very long, thin, pointed at the Su 
developed, with a distinct claw 
at the end. 
harpes — much hypertrophied, with absent. 
very strong processes (claspers) 
on the inside. 
valves — regressive, reduced to a large and long, narrow at base, 
pair of small distal lobe like ap- broadened and rounded distally. 
pendages of the harpes. 
-saccus — broad, rounded, not pro- long, narrow, projecting far into the 
minent. abdomen. 
Female genital organs. 
bursa copulatrix —balloon-like, with- elongated, with a widening at the 
out a lamina dentata, distinctly distal end, which on the inner 
separated from the ductus bursae. surface is covered thickly- with 
rather long, thin teeth; a row of 
patches of similar teeth extends 
from distal to proximal end of 
the bursa, ductus bursae not dis- 
tinctly separated. 
‘ductus bursae straight. strongly bent, i. e. S-shaped. 
Русск. Эитом. Обозр. XII. 1912. Ne 1. 
