On a new Species of Tree Trap-door Sjnder. 407 



LXVII. — Description of a neio Species of Tree Trap-door 

 Spider from Trinidad. By R. I. POCOCK. 



[Plate XIX. figs. 1-3.] 



Mk. J. II. Hart lias recently sent for determination to the 

 British Museum a small series of insects and spiders from 

 Trinidad. Three species of s))ider3 were represented in the 

 series: one of tiiem is the well-known Ar<jiope argentata] a 

 second appears to be Actinopus scalops of Simon; the third, 

 however, a species of Pseudidiops, appears to be undescribed. 

 I propose therefore to name it in honour of its discoverer. It 

 may be diagnosed as follows : — 



Pseudidiops ITartii^ sp. n. 



Colour. — Carapace olivaceo-piceous, with black postero- 

 lateral border and black ocular tubercles ; abdomen purplish 

 brown ; legs mostly testaceous, but the whole of the patella 

 and the distal end of the tibia black ; tarsi reddish black ; 

 sternum and coxaj Havous, maxillai and labium olivaceo- 

 castaneous. 



Carapace smooth, high, the posterior portion sloping 

 upwards to the deep crescentic fovea; the area immediately 

 in front of this fovea abruptly elevated, deeply longitudinally 

 sulcate, and furnished on each side with a single large seti- 

 ferous puncture ; the area of the carapace between these 

 punctures and the anterior border nearly flat, but bearing the 

 two elevated ocular tubercles, the area between the two 

 tubercles only a little larger than the diameter of the anterior 

 eyes of the posterior tubercle, which is furnished with a 

 strong seta between these eyes. 



Mandibles weak, smooth above, furnished in front with 

 long stiff sctge, the inner angle above the base of the fang 

 produced into a sliort s|)icular prominence ; fangs short but 

 robust. 



Labium separated from the sternum by a deep depression, 

 narrowed in front, its distal border rounded, beset with long 

 stiff setEe and armed with a transverse row of four short 

 conical spines, behind which are two less conspicuous but 

 similar spines. 



MaxilUe covered with stout conical spines. The femoral 

 segment of the palp furnir^hed internally with a few irregu- 

 larly arranged long setce, which distally increase in stoutness 

 and become spiniform ; the patella armed internally with two 



