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



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

 Spider from Trinidad. By R. I. POCOCK. 



[Plate XIX. figs. 1-3.] 



Mr. J. H. Hart has recently sent for determination to the 

 British Museum a small series of insects and spiders from 

 Trinidad. Three species of spiders were represented in the 

 series : one of them is the well-known Argiope 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 Hartii^ 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 coxae Havous, maxiliaj and labium olivaceo- 

 castaneous. 



Carapace smooth, high, the posterior portion sloping 

 upwards to the deep crescentic fovea; the area immediately 

 in fi,'ont 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 setae, the inner angle above the base of the fang 

 produced into a short spicular 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 setaj and armed with a transverse row of four short 

 conical spines, behind which are two less conspicuous but 

 similar spines. 



MaxillcB covered with stout conical spines. The femoral 

 segment of the palp furnished internally with a few irregu- 

 larly arranged long setae, which distally increase in stoutness 

 and become spiniform ; the patella armed internally with two 



