1870.) . 43 
The side, as far as the spiracles, is freckled and clouded with dark purplish- 
brown, similar to the back, and a fine longitudinal line of the pale ground colour 
runs through it near the lower part: the spiracles are black, and followed by a 
broad stripe of the pale ground colour, and then a fine interrupted line of blackish ; 
the tubercular dots black, each emitting a hair, and the pro-legs tipped with 
blackish. 
In other examples, the ground colour is pale pinkish, ochreous, or flesh colour, 
and the markings are brown and much paler; the black wedge shapes almost, or 
even entirely, absent, and the dorsal line is interrupted at the beginning of the 
segments. 
By the middle of October these larve had ceased feeding, and did not retire 
to earth, but remained motionless within their hiding places in the leaves, and so 
continued until the beginning of December, when they became pup therein. 
The pupa is nearly half-an-inch long, rounded at the head, thick in the middle, 
the abdomen tapering to a point with anal spikes attached to the threads spun 
within the leaf; its colour is bluish-black, and it is entirely without gloss. 
The perfect insects appeared from 22nd to 24th of May, 1868.—Wm. BuckLEr, 
Emsworth, January, 1870. 
Note on the nomenclature of wing-nerves, and on the importance of the abdominal 
appendages in specific determination.—In the last part of the Stettiner Entomol. Zeitung 
(Jahrg. xxxi., p. 316), is an article by Dr. Hagen on the great difference of nomen- 
clature used for the neuration of the wings in the various orders of insects, and, 
on the assumption of an undoubted fact that in all the orders the perfect insects and 
their nerves are formed after one analogous and common type, advocating the desir- 
ability of applying in every case the same name to each nerve or its branches. The 
practicability of the proposed system is illustrated by figures. ‘‘ Now,’ Dr. Hagen 
says, “no one concerns himself about his neighbour, each is sovereign in his 
own domain.” Besides drawing attention to this subject, I wish more particularly 
to advert to the following remark on other structural and specific characters. 
*‘T have seen Acentropus in plenty. From the locality mentioned by Nolcken 
*‘and also among those found by Lenz on the sea-shore in East-Prussia, it is found 
“with remarkable brown-marked wings. Naturally, I do not stop here to decide 
‘“‘ whether several species exist. In every case the examination of the anal ap- 
~“pendices would afford certain data. I have always wondered that Lepidopterists 
“ should ignore such remarkable structures, for, as far as I know, the slight essay in De 
‘“‘ Haan’s beautiful work remains entirely without imitation. The having todo only 
“with colour of wings, dots, streaks, spots, rows of dots and streaks of spots, has al- 
“ ways kept me far from Lepidoptera. Linné, whose fame and name were first due to 
“his investigation of the genitalia of plants, knew also their difference and variety 
“ininsects. Remarkably enough, he once said, if my memory is correct, ‘ Genitalium 
“ disquitio displicet.’ Just now, I have cursorily looked over a great many Lepidoptera, 
“and am still more astonished that these parts are so neglected. Precisely in the 
“ most difficult genera (Argynnis, Hesperia, Noctua), where the species are nearly 
«allied and often difficult to determine, they afford excellent differential characters. 
“Mr. Burgess is engaged here in the investigation of them in American species, and 
“ his drawings and preparations delight me daily. I am convinced that this species- 
* embracing investigation will result in a real advance of science.” 
In the large Lepidoptera, the examination of the genital segments may be com- 
