REV. O. P. CAMBRIDGE ON BRITISH SPIDERS. 449 
also, as it appears to me, without a doubt, the one described both in the Edin. Philos. 
Mag. as Erigone atra, and in Brit. and Ir. Spid. as NW. longipalpis. Mr. Blackwall 
thinks this is the species described by Sundevall as L. longipalpis : but though Sundevall's 
description would suit it, yet he has distinguished his “forma principalis "- from what 
appeared to him a variety (var. (3) differing in length of the male palpi from the “forma 
principalis; " and there is, it appears, a similar difference between N. longipalpis (Sund., 
Westr.) and E. atra (Bl.) =. vagabunda (Westr.), from which it seems clear that the 
latter belongs not to the “forma principalis," but to the var. 8 of Sundevall, to which 
latter, therefore, Mr. Blackwall's name “atra” attaches, to the exclusion of the name 
given it more recently by Mr. Westring. It is not rare at Bloxworth; and I have also 
received it from various other parts of England. Typical examples of Erigone vagabunda 
(Westr.) received from Dr. Thorell, of Upsala, Sweden, are also identical with JN. atra. 
NERIENE PROMISCUA, n. sp. (Pl. XXXIV. no. 25.) 
This species is very nearly allied to all three of the foregoing, from which, however, 
it is not difficult to be distinguished by the form of the radial joint of the palpus; like 
N. dentipalpis it has a tooth-like spine beneath the radial joint; but unlike it, this joint 
is very narrow, and scarcely spreads at all at its extremity, where, on the upperside, it is 
simply emarginate or somewhat bifid, the interior prominence being longer and stronger 
than the exterior; the palpal organs differ in structure from those of the three 
foregoing species, from which, in point of colour and size, it is not easy to be distin- 
guished. In the form of the fore extremity of the radial joints of the palpi, it bears per- 
haps a nearer resemblance to N. longipalpis (Sund., Westr.) than to the others. Two 
adult males of this species were captured by myself in Scotland in July 1861; and several 
were contained among examples of N. vagabunda and N. dentipalpis, received lately from 
Mr. Blackwall, captured in North Wales; and one was also contained among examples 
of all three of the foregoing species received more recently still from Mr. Meade, by 
whom they were found near Bradford, Yorkshire: in all these instances it had been con- 
fused with the others. I have here made a first attempt to discriminate the four species 
at present known as British. "There are numerous females in my collection hitherto attri- 
buted to N. longipalpis (Bl.); probably they comprise females of some or all the other 
species as well; but as yet I have not discovered the distinguishing specific characters, 
which no doubt exist, though in general appearance and size they bear the closest resem- 
blance to each other. 
NERIENE BIFIDA. (Pl. XXXIV. no. 14.) 
Neriene bifida, Cambr. Zoologist for 1863, p. 8587. 
Similar to Neriene rubens (BL) in general form, size, and colour, this spider may be at 
once distinguished by the peculiar form of the fore part or ocular region of the cephalo- 
thorax; this is distinctly divided into two segments by a deepish longitudinal cleft or 
notch. Each segment supports four eyes, closely grouped together in a quadrangular 
form. 
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