as 
216 Mr. F. W. Edwards on British Limnobiidae. 
M. pleuralis Meij., is evidently the species Verrall recorded 
as M. ochraceus, though he also had it under a manuscript 
name. Localities are Slapton and Dawlish (8. Devon), 
Wicken, and Arran. 
M. ochraceus Mg., in the sense of de Meijere, seems to be 
a rare species with us. I have only seen one male (Bonawe, 
W aterston). 
M. flavus Goet. (Pl. I. fig. 12). 
Similar to M. ochraceus. Thorax and abdomen entirely orange. 
Legs blacker than in most other species of the group; femora orange 
at the base, somewhat swollen on the apical third. Hypopygium 
as in fig. 12; the upper clasper has a waved appearance when seen 
in side view. 
Localities : Corriegills, Arran (F.W.E.); Catacol, Arran 
(Waterston) ; Snailbeach, Salop (F.W.H.); Pateley, nr. 
Leeds (Cheetham). } 
M. propinquus Hee., and M. cinereifrons Meij., are both 
common species, indistinguishable apart from the hypo- 
pygium, and frequently, though not invariably, found 
together. 
RHYPHOLOPHUS. 
The two groups of which this genus is composed in 
Europe and North America seem to me to be of at least 
subgeneric if not generic value. The genus has sometimes 
been divided on the presence or absence of a discal cell, 
and the mode of forking of the media; but a much better 
division is the one proposed by Verrall, based on the length 
of the axillary vein. If we regard the length and curvature 
of the axillary vein as a character of generic importance 
in Erioptera, 1t seems inevitable to take the same view of 
the parallel and equally constant condition in Rhypholophus. 
This name will then be restricted to those species with a 
long and sinuous axillary vein, of which we have only two 
in Britain, R. haemorrhoidalis and R. varius. Rondani’s 
name, Ormosia, is available for the other group, in which 
the axillary vein is short and divergent from the anal. 
ORMOSIA. 
In this genus O. fascipennis Zett. (pentagonalis Lw.) 
is distinguished from the other British species by the 
possession of a closed discal cell; O. pseudosinuilis Lundst., 
and O. similis Staeg., by their yellow colour; O. lineata 
- 
Py ar 
