492 Rev. A. E. Eaton's supplementary notes on 
(Ent. Mo. Mag., 2nd ser., vol. v., pi. iv., figs. Ps. 3, ?), 
great disparity is noticeable in the relative breadth and 
acuteness of the wings; and although fig. 12 may be 
rather too narrow (through insufficient expansion) and 
the others rather too broad (having been photo-litho- 
graphed from tracings pasted and rolled out upon 
card-board, which spread under pressure of the roller), 
one must not expect, when all this is allowed for, that 
the original of fig. 12 had exactly the same shape as the 
wing of the European Psychoda. Perhaps it conforms 
to the wing of the North American Ps. nigra, Banks, 
described in ^' The Canadian Entomologist,'' xxvi., 331 
(1894). A wave in the membrane seems to have 
brought the free termination of the radial sector 
nearer to the cubitus (in fig. 12) than it would have 
been otherwise (compare the upper fig. Ps. 3, cited 
above) ; for there is no instance recorded of the sector 
being annexed to the cubitus in Psychodidse. And 
with regard to the pobrachial nervure, it may be 
well to quote what is said by Baron Osten Sacken, in 
litt.y respecting the original pencil drawing of fig. 12 : 
** The branch of the pobrachial fork was represented as 
stunted, but a vestige of a prolongation was nevertheless 
visible, the pencil drawing of which Dr. Miiller had 
apparently rubbed out. . . , This vestige, . . I think, 
was a mistake." It was, therefore, eliminated, in 
proving, from the lithograph ; but in the unrevised 
*^ proof," the vestige is prolonged from the abrupt end 
of the branch, inwards to the main nervure. For 
anything questionable thereabouts, and for the semblance 
of the merging of the pobrachial and postical nervures 
into a common trunk, the wave and concomitant fold in 
the membrane may fairly be held responsible. The 
region of the basal cells and radio-cubital stem needs 
further exploration ; but so far as one can judge, the 
neuration would be brought by correction of tig. 12 into 
essential conformity with that of a Psychoda. 
The head of Maruina spinosa (fig. 16), judging from 
the antennge, resembles that of species ranked in the 
first and second sections of Pericoma : the haunts of the 
fly, mentioned by Dr. Miiller, are in favour of the species 
belonging to the latter section. It might be well to 
note the arrangement of the hairs on the scape of the 
antenna, when the original locality is searched for the 
