Wap. x. 
DIPTEEA AND HEMTPTEKA. 
349 
18 in the genus Bibio, in which the males are blackish 
0r quite black, and the females obscure brownish-orange. 
The genus Elaphomyia, discovered by Mr. Wallace ls in 
New Guinea, is highly remarkable, as the males are 
furnished with horns, of which the females are quite 
destitute. The horns spring from beneath the eyes, and 
curiously resemble those of stags, being either branched 
or palmated. They equal in length the whole of the 
body in one of the species. They might be thought 
to serve for fighting, but as in one species they are 
of a beautiful pink colour, edged with black, with a 
Pale central stripe, and as these insects have altogether 
a very elegant appearance, it is perhaps more pro- 
bable that the horns serve as ornaments. That the 
dales of some Diptera fight, together is certain ; for 
Prof. Westwood 19 has several times seen this with some 
s Pecies of Tipula or Harry-long-legs. Many observers 
believe that when gnats (Oulicidas) dance in the air in 
a body, alternately rising and falling, the males are 
courting the females. The mental faculties of the 
>, o 
1 hptera are probably fairly well developed, for their 
Nervous system is more highly developed than in most 
°ther Orders of insects . 20 
Order, Eemiptera (Field-Bugs).— Mr. J. W. Douglas, 
" ho has particularly attended to the British species, has 
biudlv given me an account of their sexual differences. 
The males of some species are furnished with wings, 
"didst the females are wingless ; the sexes differ in the 
f °rm of the body and elytra; in the second joints of 
their antennae and in their tarsi ; hut as the signification 
Is ‘ The Malay Archipelago,’ vol. ii. 1869, p. 313. 
19 ‘ Modern Classification of Insects,’ vol. ii. 1840, p. 526. 
50 See Mr. B. T. Lowne’s very interesting work, ‘ On tlie Anatomy of 
Blow-Fly, Mu sea vomitoria,’ 1870, p. 14. 
