STATES OF INSECTS. (Jmago.) 303 
a hair-pencil, and coloured the water: which therefore 
were superficial, and, as it were, laid on*. The yellow 
males, therefore, that Reaumur observed, were probably 
such as had the superficial blue colour which distinguishes 
them washed off. In Calepteryx Virgo the former are 
of a lovely silky blue, and the latter green. In Agrion 
nature sports infinitely in the colours of the sexes. 
In the order Hymenoptera there are often differences 
equally great; the sexes of many of the Ichneumons and 
Saw-flies are of quite different colours. The former tribe 
Linné has divided into sections, from the white annulus 
observable in the antennze of some, and from the colour 
of their scutellum: but these are often merely sexual 
characters >. The male of Anthophora retusa, akind of 
wild bee, is wholly black, the female wholly gray, and 
of so very different an aspect that they were long re- 
garded as distinct species ; a mistake which has likewise 
occurred with regard to the sexes of Osmia cerulescens, 
another bee, of which the.male has a bronzed and the 
female a violet abdomen *. ‘The nose of male Andrene 
is often yellow, or white, as in 4. hemorrhoidalis—when 
that of the female is black *. The /abrum also is often 
of a different colour in the sexes, as in Ceratina. 
In the Diptera, Aptera, Arachnida, &c., 1 am not 
aware of any striking difference in the colours of the 
sexes. 
ii. The sexes of insects vary (but more rarely than in 
colour) in their sculpture also, and pubescence. Thus the 
4 Entomologische, &c. 224, 
> De Geer ii. 847. 850. Jurine Hymenopt. 100. 
© Kirby Mon. Ap. Angl. ii. 296. 264. 
@ Ibid. ii. 142—. 144, 147, 148, &c. 
