8 Messrs. H. J. Elwes and J. Edwards on 
abdomen in one or more examples. On the whole, the 
application of the “‘ genitalia test’’ to these insects goes 
to show that the species are more numerous, and, in 
themselves, less liable to vary than has been generally 
supposed; the latter circumstance, indeed, was to be 
expected, if one considers how much easier it is to 
ascribe variability to a known species than to investigate 
the affinities of a possible new one. 
It isa fact within the experience of Edwards, based 
upon nearly twenty years’ continuous observation of the 
characters afforded by the male genitalia in the Homo- 
pterous Hemiptera, as well as insects of other orders, 
and supported by the experience in the same direction of 
Dr. Sharp and Mr. Champion in the Coleoptera, Mr. 
McLachlan in the Trichoptera, &c., and Messrs. Godman 
and Salvin in the Lepidoptera, that any well-marked 
peculiarity of form in these organs generally proves to 
be constant in all the individuals which we are not 
otherwise precluded from considering as belonging to the 
same species. Under these circumstances we have in 
this paper described and illustrated certain insects which 
we were perfectly able to define, although we had not, 
in some cases, more than a single example before us. It 
has been suggested that we ought not to describe and 
name insects until we were in possession of substantial 
information as to their range, time of appearance, 
habits, &c. ; but it was not explained how these statistics 
were to be collected whilst the objects of them remained 
without names. 
Throughout this paper the term ‘‘ocelli” without 
modification is to be taken as referring to those of the 
under side of the hind wing; and it is essential that the 
Tables of Species be used in conjunction with the detailed 
descriptions and collateral matter. 
Grovr I. 
Small feeble species; sex-mark in ¢ absent or but 
little developed (well marked in indecora). Ocelli variable, 
sometimes punctiform, rarely altogether absent. 
TABLE OF SPECIES. 
1 (24). Upper side of hind wing without an orange band. 
2 (23). More than one ocellus. 
3 (20). One subapical ocellus. 
4 (19). Subapical ocellus in first subcostal interspace. 
