242 Annals Entomological Society of America [Vol. V, 
into M; and Mg, so that this branch in Hepialus must represent 
M; and Mg or as it is here labelled, M3+4. The position of the 
branch M, in the Lepidoptera has not been definitely placed. 
Comstock and Needham figure the wings of Sthenopis, in the hind 
wing of which there is an extra branch on Cu, which they label 
as M,. This would mean, if this interpretation is correct, that 
M, is coalesced with Cu, in the higher Lepidoptera. The wings 
figured are of a species in which Cu, is usually unbranched. 
The specimen figured is undoubtedly an abnormal specimen so 
far as the branching of Cu; is concerned and should have no 
weight in deciding what has become of My. That the above 
authors were in doubt is shown by the following foot-note taken 
from their paper: ‘‘ With our present knowledge it is impossible 
to determine the way that vein M, has disappeared in the 
Frenatz. We have seen no indication that it coalesces with 
vein Cu; as in Sthenopis, for in all pupz of this suborder that we 
have examined the medial trachea is only three-branched. We 
are obliged, therefore, to omit any further reference to this 
vein in the discussion of this order.’’ The venation of certain 
species of Hepialus is frequently abnormal. This is strikingly 
true of Hepialus humult. I have seen wings which had extra 
branches on both media and radius. In the case of radius, 
specimens have been examined that contained six, seven, and 
even eight branches. So that the condition figured in the hind 
wing of Sthenopis is not unusual. The fact that none of the 
pupal wings showed any branching of this portion of the trachez 
of media in either wing and the further fact that Hepzalus is one 
of the most generalized of lepidopterous insects, where of all 
places positive evidence should be sought for demonstrating 
this point, the interpretation must be, that the third branch of 
media in both wings, not only of Hepizalus but of the Lepidop- 
tera, is M3+4. 
Radio-Medial Cross-Vein.—The radio-medial cross-vein is 
distinct, in its usual place between R; and M,, and is not pre- 
ceded by a trachea. 
Medial Cross-Vein.—The medial cross-vein is present, 
distinct, in its usual position between M, and M3, and is not 
preceded by a trachea. 
Cubitus.—The vein cavity of the cubitus of the front wings 
is located some distance behind the radio-medial vein cavity. 
It is free for a short distance at the base of the wing, then is 
