290 Mr. T. Vernon Wollaston on 
(Sp. 1271) Homalota gregaria. 
So far as the Madeiran Group is concerned, this 
European Homalota had been observed only in Porto 
Santo—where (as in certain of the Canarian islands) it 
swarms, beneath stones and shingle, along the edges of 
the brackish, half-dried streams; but during our late 
visit to Madeira I met with two examples of it (on the 
80th of March, 1870) towards the extremity of the Ponta 
de Sio Lourenco,—thus introducing the species into the 
local list of Madeira proper, and affording another in- 
stance of the curious similarity which exists between the 
fauna of that low eastern promontory and that of Porto 
Santo. Dr. Sharp says, concerning this Homalota, ‘ It 
is just possible that it is a distinct species from our 
gregaria ; but even if so, it is found in England likewise, 
—for the ‘ H. gregaria, var. minor’ of my paper must be 
referred to it.” 
(Sp. 1273) Homalota amnigena. 
According to Dr. Sharp this Homalota is allied to the 
plamfrons, of Waterhouse. 
(Sp. 1275) Homalota longula. 
The Canarian specimens of this fragile little Homalota 
agree in every respect with the ordinary European ones ; 
but those which I have hitherto captured in Madeira are 
just appreciably smaller and narrower, and Jikewise (un- 
less indeed the whole of my examples be immature) paler, 
with their head perhaps a trifle narrower and less square ; 
so that Dr. Sharp is of opinion that they may possibly 
prove to be the representatives of a species which is dis- 
tinct from the other, however closely allied to it. Still, 
the differential characters are so slight that I will not at 
present venture to do more than indicate the Madeiran 
form as a geographical one; though I will propose for it 
in the following emended diagnosis a varietal name, m 
the event of future investigations rendering its isolation 
necessary. 
Homalota longula. 
H. et synonymia ut in Cat. Can. Col. p.539; sed adde ; 
var. 8, maderce [an species distincta ? ]|—vix minor et 
