REV. O. P. CAMBRIDGE ON NEW AND RARE BRITISH SPIDERS. 531 
The following particulars in regard to some points of structure in the present species 
will perhaps help towards the distinguishing between it and several others nearly 
allied. 
Falces slenderer and shorter than those of C. erroneum, sp. n. (post, p. 532), but slightly 
longer in proportion to the length of the maxillæ than those of C. nutrix, Westr. 
Palpi: the radial joint is distinctly less than double the length of the cubital—in 
fact, not more than half as long again; the digital joint is longer than the radial and 
cubital together, and has a strong angular prominence near its extremity on the outer 
side (a similar prominence is visible in C. nutrix, Westr.; but this is less strong and 
removed further back from the extreme point of the digital joint); from some points 
of view this prominence, in the present species, being so near the extremity of the 
digital joint, makes it appear, as it were, bifid; a similar prominence is also visible in 
C. erroneum, but is still further removed back from the extremity of the digital joint, and 
less strong than in C. nutrix, Westr. ; while in C. Pennyi, sp. n. (post, p. 533), it is scarcely 
visible at all. The spur at the base, on the outer side, of the digital joint is sharp-pointed 
and strong, stronger than in either C. erroneum or C. nutrix, Westr., and, when looked 
at from the front, projects more outwards than in the former species. 
Until my attention was called to the absence of the abdominal oblique yellow stripes 
and to the cloven extremity of the radial apophysis, I had always concluded this species 
to be identical with Cl. erratica, Bl.; and, indeed, so had also Mr. Blackwall himself. 
I have lately, October 1872, received an example of this species from Mr. J. W. H. 
Traill, by whom it was found near Dunkeld, Scotland. 
CHEIRACANTHIUM NUTRIX. (Pl. XLVI. fig. 4.) 
Cheiracanthium nutriz, Westr. Ar. Suec. p. 379. 
I do not venture to cite any further synonyms of this species. That it would be im- 
possible to do so with any real accuracy is evident from.the difficulty and uncertainty 
which, Dr. Thorell has shown, beset the subject (Syn. Eur. Spid. pp. 207-8). Dr. T. 
cites four synonyms doubtfully, and two others (from Walckenaer) guarded by “ saltem 
ad partem." Probably the remaining synouym (from Sundevall) is the only really 
reliable one. 
From adults of both sexes of Westring's species I obtain the following characters, 
which distinguish it from C. erronewm (post, p. 532) = Cl. nutrix, Bl. (fig., non descr.). 
First. The cephalothorax is immaculate. 
Secondly. 'The abdominal macula is not followed either by spots or angular bars, as in 
that species; in fact, no marking was visible on the abdomen, except the normal macula 
on the fore part of the upperside. 
Thirdly. The falces are shorter, straighter (i. e. less divergent), and project less than 
the length of the maxillz beyond the extremities of the latter. 
Fourthly. The digital joint of the palpus is altogether larger and stronger, as long as, 
or even a little longer than, the length of the radial and cubital joints together. The 
relative lengths of these last two seem to be almost the same as in C. nutrix (BL), the 
radial being nearly double the length of the cubital. 
VOL. XXVIII, 4c 
