^Ir. S. Hirst on new Scorpiona. 409 



carapace 6, of tail about Mo, of fourth segment of tail G"2t), 

 of hand-back 5, of movable tinger 8"25; width of first seg- 

 ment of tail 3"75, of fifth -I'G, of hand 4-25, of tibia of chela 

 2"7o ; height of t'ourth segment of tail 4'25. 



? . Total length 55"75 ; length of carapace 6, of tail 

 about 32"n, of tburth segment of tail 5*75. of hand-back 3*5, 

 of movable finger 7"5 ; width of first segment of tail 3'5, of 

 fifth 3, of hand 2o ; height of fourth segment of tail 3. 



Material. — A number of specimens from Chama, Venezuela, 

 including several adults, two of wiiich are of the male sex. 



Urodacus hilUeriy sp, n. 



J . — Anterior part of carapace smooth and very finely 

 punctured ; the sides and posterior part of it finely granular. 



Tergites finely granular and with the median keel very 

 weak and inconspicuous; as in U. hoplurus, Poc, the inner 

 keels of the last tergite scarcely reacli the middle, but the 

 outer ones are very long. 



Last sternite with its pair of keels exceedingly weak 

 and scarcely visible,* instead of being rather strong as in 

 U. spinatus, Poc. 



Tail a little less than five times as long as the carapace; 

 the upper surface and sides finely and sparsely granular, the 

 lower surface of the fifth segment being more distinctly 

 granular [in U. hoplurus the surface and sides of the tail are 

 quite smooth and the lower surface of the fifth segment has 

 cnly a few scattered granules] ; terminal tooth of tlie superior 

 keel of the caudal segments very large ; it is not nearly so 

 erect as is the case in U. spinatus and U. hoplurus, but points 

 backwards. Inferior keels of anterior segments weaker than 

 in U. spinatus, but not so weak as in U. hoplurus. The 

 inferior median keels of the fourth segment smooth^ instead 

 of being weakly granular as in U. spinatus. Vesicle finely 

 granular. 



Hand very similar in shape to that of U. hoplurus; it has 

 a row of 19 pores on the under surJuce (not counting those 

 external to the keel) and two other pores placed on the inner 

 side of and parallel to the first two of the row. Tibia with 

 14-15 pores below. 



Legs. — Metatarsus of first leg with a row of 5 or 6 spine?, 

 that of the second with 5-7 spines. 



Pectinal teeth 22-24 in number. 



Measurements in mm. — Total length 96 ; length of cara- 

 pace 12, of first segment of tail 7-25, of fifth segment 13; 

 width of first segment 5, of fifth 3-75. 



