84 Mr. R. I. Pocock on 



patella + tibia of fourth a little longer than those of first, also 

 its protarsu3 + tarsus longer than those of first. 



Stridulating-organ like that of P. Camhridgn, but the 

 spines on the maxilla less numerous, being only about twelve 

 in number and shorter. 



Measurements in millimetres. — Total length 23 ; carapace 

 14 5 ; first leg 42, second leg 38-3, third leg 35-5, fourth 

 leg 43"5; patella + tibia of first 16, of fourth 15*5; protarsus 

 + tarsus of first 14, of fourth 16. 



Loc. Cauca in Colombia (received from M. Goudot in 

 1846). 



'I'liis species is easily distinguishable from P. Cambridgii, 

 which in the structure of its stridulating-organ it more nearly 

 resembles than docs F. ecclesiastieus, by the shortness of its 

 anterior legs as compared with the posterior. 



Psahnopceus emeraldus, sp. n. 



? . — Colour (dry specimen) a tolerably uniform deep olive- 

 brown above, sooty black below. 



Carapace almost as long as patella + tibia of first or of 

 fourth leg, a little longer than protarsus + tarsus of first and 

 almost as long as those of fourth. 



Legs of first and fourth pairs subequal, patella + tibia of 

 first subequal to those of fourth, protarsus + tarsus of fourth a 

 little longer than those of first. 



Stridulating-hristles on maxilla not isolated from the oral 

 fringe, distally on the same straight line with them and but 

 little diffirentiated, those at the proximal end longish and 

 slender, much like the rest of the series, not short, thick, and 

 curved as in P. ecclesiastieus. 



Measurements in millimetres. — Total length 28 ; carapace 

 13; first leg 37, fourth leg 38 ; patella + tibia of first 13*5, 

 of fourth 13*8; protarsus + tarsus of first 12-5, of fourth 14. 



Loc. Colombia, emerald-mines at Muzo, in the valley of 

 the iMeta, an affluent of the Magdaleine (Z. da Costa). 



Easily distinguishable from P. ecclesiastieus, which it 

 approaches in the structure of its stridulating-bristles, by the 

 greater shortness of its legs, &c. 



The females of the foregoing species may be distinguished 

 as follows : — 



a. Stridulating-spines on maxilla in the same straight line 

 as the edge of the oral fringe and scarcely separated 

 from it. 

 ffl'. Carapace scarcely longer than femur of first or 



fourth leg, much shorter than their patella+tibia. ecclesiastieus. 



