90 
Psyche 
[March 
the course of the median veins is so extremely aberrant, 
that I am the least confident of my interpretations in this 
region of the fore wing, although of course it is an easy 
matter to interpret the median veins of the hind wing. I 
have figured the median veins of the wings of Notiothauma 
from all available sources, using the original photograph 
(which is much clearer than the published figure) from 
which the illustration of Dr. C. E. Porter’s note on 
Notiothauma was made (Revista Chileana Hist. Nat., 1929, 
XXXIII, p. 288), — Dr. Porter having very kindly sent me 
the original photograph — and I have also used Esben- 
Petersen’s figure of the wings of Notiothauma, but even 
with these figures to aid me, in addition to examining the 
wings of two specimens of Notiothauma, I am not very 
sure of the course of the branches of M in the fore wing! 
In his review of Imms’ book, Tillyard, 1926 (N. Z. Jour, 
of Science and Technology, 8, p. 127) states that the 
“thyridium is a hyaline area on M just before it forks” in 
Trichopterous wings, and there is a clear spot at the fork- 
ing of M in Nannochorista, Sisyra, etc. Since there is a 
hyaline area (resembling the so-called bullse) labelled b in 
Figs 1, 3, 4, 5 and 6 at the base of what Esben-Petersen 
(1. c.) considers as the first fork of M in the fore wing of 
Notiothauma, I feel almost certain that the forking of M 
is at the point labelled b in these figures. This interpreta- 
tion, however, would leave a whole vein unaccounted for 
(can this be M 5 ?) but lying between the concave anterior 
branch of M and the convex anterior branch of Cu (i. e,, 
Cui, whose course is indicated by a + sign in Fig 1) in 
these figures. Unlike the typically short M 5 of most insects 
(although M 5 is longer in some Psychopsidse) , the vein in 
question is of considerable extent, and joins the rest of the 
branches of M instead of extending across to Cui as the 
vein M 5 usually does, and as is done by the vein labelled 
M 5 in Fig. 1, etc. I am therefore inclined, purely pro- 
visionally, to interpret as the first forking of M, the fork 
which is located just distad of the dotted line running up 
from the label M in Fig. 1. This fork occurs in all of the 
wings, and figures of wings, which I have seen; so it can 
hardly be an added cross vein that has taken on the appear- 
ance of a fork in one specimen : furthermore, it is continued 
