202 Transactions. 
Type in British Museum collection. 
This common species varies greatly in size, specimens being found with 
an expanse from 20mm. up to 30mm. It may readily be distinguished 
by its folding the wings rather flatly down above its abdomen, with much 
less rolling of them around the body than in the Leptoperlidae, and also 
by its striking colour-pattern. The whole of the body is black, the wings 
blackish with weakly formed distal cross-venation, the forewing with a 
conspicuous cream-coloured humeral patch, which is continued more or less 
clearly as a pale stripe along part or whole of the costa. The legs are 
black, but the tibiae have a broad band of pale yellow occupying more 
than half their length. Cerci short. 
It is of interest to note that a species of Tasmanoperla existing in 
Victoria, but not yet described, has a coloration closely similar to this 
species. There is also to be found in Otago a species of Zelandoperla, not 
yet described, which closely resembles it in coloration, but can be at 
once distinguished by its much longer cerci, as well as by its very different 
venational characters. 
e larvae are very sluggish creatures, and frequently congregate at the 
edges of streams, under moist rocks or in wet trash, where other stone-fly 
larvae would not be able to exist. They are also unique in being able to 
stand removal from their natural habitat and living for quite a long time 
under abnormal conditions, even withstanding a considerable degree of 
desiccation. Probably they breathe through the integument generally, and 
perhaps also by means of gills placed internally within the anal opening. 
Family LEPTOPERLIDAE. 
This family was first recognized as a distinct, group by Newman in 
1839, and has been raised to tribal rank by N. Banks under the name 
Leptoperlini, these authors not considering the whole of the Perlaria to be 
entitled to more than family rank. Now that the ordinal rank of the 
Canadian Entomologist, February, 1921, pp. 35-40. It should be noted that 
Enderlein’s family is a composite one, and that when, in another pape? 
he subdivided it, he placed a portion of the true Leptoperlidae within the 
subfamily Gripopteryginae, together with the whole of the Eustheniidae 
and Austroperlidae, while another portion was placed in the subfamily 
Antarctoperlinae. This curious classification was brought about by select- 
ing as the primary characters for subdivision the forked or simple condition 
of Rs and Cu,. A careful study of the whole group reveals the fact that 
two genera 50 closely allied as to agree in almost every character may differ 
only in one having Rs forked and the other having it simple—e.g-, : 
ane Ce КАКА RS ШОНЕТ? Г у Me a 
" n vog 
E NUES E Hi ae) o5 
x 
т 
у 
$ 
M 
