1873.] SPIDERS FROM ST. HELENA. 215 



cephalothorax ; and the fangs, which are also equal to the falces in 

 length, are strong, sharp-pointed, of a deep-black chestnut-brown 

 colour, tolerably straight in the middle, but bent at both ends ; a 

 constriction towards their extremity gives them at first sight the 

 appearance of being articulated at that point. 



The maxillce are of the normal form, and are thickly furnished 

 with strong black hairs on their inner margins (next to the falces). 



The labium is broadish oblong in form, strorigly emarginate at 

 the apex, and does not much exceed in length half that of the 

 maxillae ; its colour is a dark chestnut-brown. 



The abdomen is short-oval, and projects over the base of the 

 cephalothorax ; it is of a dull yellow colour, very sparingly clothed 

 with short fine hairs, and marked on its upperside, near the middle, 

 with four impressed dots of a rusty hue, forming a square, whose 

 fore side is the shortest. 



A single example of this exceedingly fine and distinct Cheiracan- 

 thium was contained in Mr. Melliss's St.-Helena collection ; and I 

 have great pleasure in connecting with it the name of that gentle- 

 man. By the size of the falces it is allied to C. itulicum (Canestrini 

 and Pavesi, Atti della Soc. Ital. di Scienze Nat. xi. fasc. 3, 1848, 

 p. 114, separate copy?; also Arch. p. Zool. Genova, ser. 2, 

 vol. iii. tab. 4. fig. 3) ; but it may be distinguished at a glance by 

 the remarkable difference in the character and relative proportion 

 of the palpal joints, as well as by the greater length of the legs of 

 the first pair of the present species, and the less size of the Spider 

 itself. 



Cheiracanthium planum, sp. n. (Plate XXIV. fig. 5.) 



Adult male, length 4 lines. 



The cephalothorax of this species is of a rather broad oval, only 

 slightly constricted laterally in front, and flattened above, its upper 

 convexity being very slight, and at the fore part it is somewhat 

 squarely truncated ; it is of a yellow colour, slightly suffused in front 

 with pale reddish brown ; the space enclosed by the four central eyes 

 is dusky blackish ; and from them an indistinct suffused line of the 

 same runs back along the middle, disappearing on the hinder slope. 



The eyes are in two rows, and occupy a broad transverse, but 

 very narrow longitudinal area, the fore lateral eyes (when looked 

 at from the front) being very nearly as wide apart as the width of the 

 two falces ; the clypeus is obsolete, owing to the fore central eyes 

 being placed immediately upon the fore marginal line of the caput. 

 The eyes are small, and do not differ much in size ; those of the 

 fore central pair are rather more than an eye's diameter distant 

 from each other, and each is considerably further removed from the 

 fore lateral eye on its side ; those of the hind central pair are further 

 from each other than those of the fore central pair, the four central 

 eyes forming a square whose fore side is the shortest ; and the space 

 which separates the central eyes is less than that which separates each 

 from the hind lateral on its side, in about the same proportion as 

 above mentioned in regard to the eyes of the foremost row ; those 



