new Sj)ecies o/'Ctenus. 405 



anterior centrals. Anterior centrals scarcely smaller than 

 posterior centrals, two thirds a diameter apart. Clypeus one 

 third fi-reatcu- than the diameter of an anterior central eye. 

 Central quadrangle slightly longer than broad, slightly 

 narrower in front. 



]^ulua broader than long, concave in the centre, with a dark 

 chitinous lobe on each side, flanked by a sharp, erect, stout, 

 conical spur. (The form varies in the two specimens before 

 iiic, but not materially.) 



An adult female occurs in the Keyserling collection, taken 

 at 'J'aquara, while another in Rev. O. Pickard Cambridge's 

 collection was taken by Mr. W. Rogers on the llio Parana. 



6. Ctenus calcarifer, sp. n. (PI. VII. fig. 10.) 



1'ypc, c?, in coll. Brit. Mus. 



JJal). Baram River, Borneo. 



c? . Carap. T'S x 6 mm. ; legs i. 30, ii. 2G, iii. 2 1'J, iv. 32 ; 

 pat. + tib. i. 10, iii. G'a, iv. 8-75. 



Colour. Cara|)ace and legs deep mahogany-brown, clothed 

 with silvery pubescence (this pubescence is almost entirely 

 worn off, so that greater definition of its distribution is im- 

 possible). Abdomen dull brown, unicolorous, excej)! a double 

 row of indistinct black dots. JVo central band of white 

 pubescence, as in Floweri. 



Structure. Carapace gibbous behind. 



Kijes. Second row straight by anterior margins ; central 

 posteriors three fourths of a diameter apart, one third of a 

 diameter from the lateral anteriors. Ocular quadrangle 

 broader behind, broader than long ; anterior centrals one 

 third smaller than posterior centrals, half a diameter apart, 

 the same distance from the posterior centrals, nearly one 

 diameter Irom the margin of the clypeus. 



Fedipalp. Tibia twice as long as broad (excluding process), 

 bearing on the outer side a process whose base extends only 

 along half the outer side of the segment. The process is not 

 very concave beneath, and terminates in a broad, rounded, 

 concave, somewhat spatuliform j)oint. The tarsus bears on 

 the outer side at the base, seen from below, a stout triangular 

 spur, set at right angles to the longitudinal axis of the 

 segment. Palpal organs not occupying the total width and 

 only two thirds the length of the tarsus. Central lobe long, 

 not quite so long as in Flotoeri, broad, claviform, and strongly 

 concave on the inner margin, giving it a more or less falci- 

 form sha[;c, strongly inclined inwards. 



A single adult male was taken by Mr. Hose on the Baiam 

 River, Borneo. 



