REV. O. P. CAMBRIDGE ON NEW BRITISH SPIDERS. 409 
curved form ; this last projection might almost be deseribed as two, or the first-mentioned 
projection might be described as crescent-shaped, or, with equal propriety, there might 
be said to be ¿hree projections besides the dark-tipped one. The radial joint has also two 
prominent bristly spines on the inner side; digital joint large, oval, and pointed at its 
extremity; the palpal organs are well developed but not very complex; two semi- 
transparent prominences occupy a position near their centre, and two contiguous filiform 
tortuous spines issue from near the fore extremity and run backwards, forming a pro- 
minent and somewhat S-shaped coil over the surface of the palpal organs. The specimen 
above described was captured by myself on Bloxworth Heath in September 1860, at the 
roots of heather; one of its palpi was in course of reproduction after deprivation caused 
by some accident, and presented a remarkable stage of development. Another specimen 
was sent me for examination in 1861 by Mr. Wintle, of Gloucester, by whom it was 
captured near that city. It is nearly allied to Thomisus versutus (Bl); but, inde- 
pendently of its paler colouring, the structure of the palpi and palpal organs distinguishes 
it readily. 
The length of the adult male is one eighth of an inch. 
THOMISUS HORRIDUS. 
Aranea horrida, Fabr. Entom. Syst. p. 411. no. 16. 
Thomisus truncatus, Walck. Ins. Apt. tom. 1. p. 515. 
Thomisus horridus, Koch, Die Arach. Bd. iv. p. 49, tab. 123. fig. 280, 
Two adult females of this species were forwarded to me in 1864 by the late Mr. 
Richard Beck, of 31, Cornhill, London, by whom they were captured during the pre- 
ceding year in the neighbourhood (I believe) of London. 
Genus PHILODROMUS. 
PHILODROMUS PRÆDATUS, n. sp. (Pl. 54. no. 11.) 
Male adult. 
In size, form, colour, and general appearance this species closely resembles P. cespiti- 
colus and P. aureolus; but it may readily be distinguished from both by the structure of 
the radial joints of the palpi. The markings also of the present species are less distinct 
(when seen in spirit of wine), and the pattern on the cephalothorax is also slightly 
different from that of those two species, the form of the abdomen is also more robust. 
The figures given will explain these differences more readily than any lengthened de- 
scription. Perhaps when more specimens of P. predatus have been obtained some other 
special characters in colour and markings may be obtained. In order to examine the 
palpi of these species satisfactorily it is absolutely necessary to remove them from the 
Spider and gum them carefully on a slip of card, with the palpal organs, i. e. the under- 
side uppermost; tlie form of the projections at the extremity of thé underside of the 
radial joint will then be easily seen with an ordinarily strong magnifying glass. 
A single adult male of Philodromus predatus was captured by myself, in July 1866, 
at Bloxworth. : 
VOL. XXVII. 3 1 
