70 EEPOKT ON A COLLECTION FROM 



. BrOTBOCHACTAS POROSUS, sp. 11. 



Colour. Trunk and tail blackish brown ; fourth and fifth segments of tail and vesicle 

 paler, reddish; legs also reddish broun, cheloe with humerus and fingers blackish, 

 hand and brachium redder. 



Carapace, except on the normally smooth tracts, very distinctly punctured, especially 

 the area around and between the eyes, with very tine close-set granulation on its lateral 

 slope. Terga similarly jiunctured, witli a few very fine granules in front and on the 

 sides, the granules and punctures scarcely distinguishable with a hand-lens ; the tergum 

 of seventh abdominal somite much more distinctly granular, with larger granules along 

 the lateral border and two series forming indistinct crests on each side. Sterna punc- 

 tured, the fourth and fifth mure closely than the others, the third with a distinct smooth 

 patch in the middle of its posterior half. 



Tail barely four times as long as the carajmce ; carapace as long as first, second, and half 

 the third segments, and about as long as the fifth ; scarcely narrowed posteriorly ; all the 

 segments wide, the second nearly twice as wide as long, the fourth about as wide as long ; 

 fifth oue-tliird longer than wide, abruptly narrowed behind; segments punctured through- 

 out ; the superior, supero-lateral, and infero-lateral keels strong and grantilar ; the inferior 

 median crests almost obsolete on segment 1, more evident on segments 2 and 3, but 

 represented by irregularly arranged granules ; on segment 4? the granules assume a more 

 definite, but still incomplete arrangement in two parallel rows ; median lateral keel 

 present on segment 1, represented by a few granules on segments 2 and 3, absent on 

 segment 4 ; fifth segment with its upper edges granular and sharp, a distinct median 

 lateral keel in the anterior half of the side, and three distinct and granular inferior keels, 

 the area between them also serially granular. Vesicle narrower than the tail, wider than 

 high, punctured but not granular below. 



CheUe punctured even to the tips of the fingers; humerus with upper keels granular; 

 brachium with upper anterior keel obsoletely granular ; hand wide, distinctly though 

 not strongly carinate, not granular, except slightly so on the inner surface ; width of 

 hand about equal to length of hand-back; fingers long and slender, in contact, the 

 movable as long as the carapace, nearly twice the length of the hand-back. 



Legs punctured, not granular; tarsi furnished beneath with long, close-set, irregularly 

 arranged bristles ; the fourth tarsus long, lightly convex above, about three times as long 

 as high. 



Pectinal teeth 10 ( d 2 ); the teeth longer in d . 



Measurements in millimetres. — Total length 24 ; length of carapace 3'5, tail 15. 



Luc. Summit of Mt. Eoraima (8600 feet). 



Some of the distinguishing features of these two species of BroteocJiactas are set forth 



in the following table : — 



a. Infero-lateral crests on all tlie caudal segments strong, as strong as the supero- 

 lateral ; inferior medians present and granular; the integument punctured 

 throughout ; terga in male mostly weakly granular ; vesicle smooth ; hand 

 with two finger-keels, smooth, more globular; fingers long and slender, 

 movable as long as carapace. (Of small size, 25 mm. in length.) porosus, sp. n. 



