﻿CHEMISTRY OF INSECT COLOURS. 217 



(Journ. Linn. Soc, vol. xx. p. 157, 1888), and the species 

 described by Weise as A. aurora synonymous with C. fortunei, 

 Baly, likewise from China. The type of the genus was originally 

 described by Motschulsky as Galeruca punctato- striata, and by 

 myself as G. multicostata. 



Galerucella (Galerucida) nigrimembris, Fairm. 

 The generic name of Galerucella should evidently be substi- 

 tuted for Galerucida, since the author compares his species with 

 my Galerucella semifulva, and his description agrees with a 

 species of the latter germs, but certainly not with the genus in 

 which he places it. 



CONTKIBUTIONS to the CHEMISTKY of INSECT COLOUKS. 



By F. H. Perry Coste, F.C.S. 



IV. — Eesults. 



In this section the bare results of my experiments will be 

 found ; whilst in succeeding sections I shall have to explain at 

 some length what is, in my view, their significance, adducing at 

 the same time various details that do not appear now, but may 

 most conveniently be discussed in a resume after the broad facts 

 have been stated. 



Now I may explain that the result of every experiment was 

 noted down at once, — that is, as soon as the hour's exposure was 

 completed. From these notes there were afterwards compiled, in 

 systematic form, complete tabulations of all the results yielded 

 by these some thousand or two experiments. I do not propose, 

 however (having regard to the exigencies of space, and to the 

 tempers of the compositors), to inflict these tabulations in their 

 entirety on readers of the ' Entomologist,' who might, too, find 

 their patience sorely taxed by an attempt to wade through such 

 a mass of details. Fortunately these results, which it seemed 

 necessary to have thus tabulated for my own use, admit of being 

 very greatly condensed for publication. As regards the effects on 

 black and white, and several minor colours, they may be better 

 described without formal tabulation; whilst for the rest, remem- 

 bering that most of my reagents employed were superfluous, it 

 will be easy enough to tabulate the results for the half dozen 

 reagents which I have selected for final use. I will give, first of 

 all, the bare results, leaving comment and explanation until after- 

 wards, and taking the colours under the following headings : — 

 Black, white, yellow and orange, red and pink, chestnut-brown, 

 green, blue ; and, lastly, a few minor colours, as greyish, brown, 

 and metallic colours {sic). 



1. Black. — Insects experimented on: — Pieris brassiccs, Colias 

 edusa, Argynnis paphia, Melitcea athalia, Vanessa atalanta, 



