Mr. R. I. Pocock 071 the Genus Urodacus. 171 



ocular tubercle continued in front as smooth ridges to rather 

 more than one third of the distance between the central eyes 

 and the hind margin of the anterior incision, and behind as 

 smooth ridges to about half the distance between the central 

 eyes and the anterior angle of the triangular depression ; pos- 

 terior two thirds of the cephalothorax laterally depressed, 

 anterior third nearly horizontal ; margins of the frontal lobes 

 defined by a shallow impression. Cephalothorax quite smooth, 

 neither granular nor rugose. Eyes slightly nearer the ante- 

 rior than the posterior margin of the cephalothorax. 



The six anterior abdominal tergites smooth, with granular 

 posterior margins, each bearing anteriorly in the middle line a 

 low wide crest, which behind divides into three portions, one 

 median and one on each side ; seventh abdominal tergite 

 posteriorly and laterally granular, with two faintly defined 

 dorsal keels. 



Abdominal sternites perfectly smooth ; the anterior half of 

 each, the last excepted, marked with two sulci ; the last 

 marked in its posterior half with two smooth keels. 



The four proximal caudal segments almost entirely smooth, 

 the superior and supero-lateral keels alone being feebly 

 granular ; upper surface of fifth segment smooth, sulcate in 

 front, flat behind ; superior keel finely granular, supero-lateral 

 keel more finely granular and abbreviated ; infero-lateral 

 keels evenly denticulate, converging in front ; inferior median 

 keel consisting of two posteriorly diverging series of denticles ; 

 space between the lower median and lateral keels smooth, 

 with a granule here and there ; vesicle ovate, somewhat 

 coarsely granular beneath, smooth above and at the sides ; 

 faintly marked with longitudinal sulci, as in the following 

 species ; aculeus gently curved. 



Chela. — Upper surface of humerus furnished with a few 

 small, scattered granules, anterior and posterior borders gran- 

 ular ; anterior surface furnished with two or three larger 

 granules and with inferior border granular ; inferior surface 

 proximally slightly granular and rounded off into the poste- 

 rior surface,, which bears two larger granules near its distal 

 end. The superior, posterior, and inferior surfaces of the 

 hrachium evenly rounded, neither keeled nor granular, poste- 

 rior surface marked with two irregular series of pores, inferior 

 surface marked posteriorly with a single series ; superior and 

 inferior margins of the anterior surface feebly granular. 



Hand stout, rounded, and smooth, being feebly rugose on 

 the inner (anterior) upper margin and exhibiting above and 

 at the sides very faint indications of keels j a more conspicu- 



