440 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



7O. Genus STENETRIUM Haswell. 



Only genus. 



With characters of family. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS STENETRIUM. 



a. Terminal segment of the body armed on each side with five sharp teeth on the 

 lateral margin. First pair of legs with the upper distal angle of the fifth article 



produced in a long process Stenetrium serratum Han sen 



a'. Terminal segment of the body with only one tooth at the notch on the lateral 

 margin on each side. First pair of legs with the upper distal angle of the fifth 

 article rectangular, without process. 



b. In the male the lower margin of the hand has its proximal half concave, and 

 at the distal end a low broad process, with three or four teeth nearly equal in 

 size placed in a convex line. In the female the angle between the palmar 

 and the lower margin of the hand measures about 110; the hand is a little 



more than f as long as deep Stenetrium occidentale Hansen 



b'. In the male the lower margin of the hand has its proximal half convex, and 

 at the distal end two processes separated by a rather deep incision; each 

 process terminates in two teeth. In the female the angle between the 

 palmar and the lower margin of the hand measures about 125; the hand 



is twice as long as deep Stenetrium stebbingi Richardson 



l/ f . In the male the lower margin of the hand has its proximal half convex, and 

 at the distal end a narrow, moderately long process, with the end bifurcate, 

 and sometimes besides a feeble tooth on its proximal margin. In the female 

 the angle between the palmar and the lower margin of the hand measures 

 less than 100, and the hand is a little more than f as long as deep. 



Stenetrium antillense Hansen 



STENETRIUM SERRATUM Hansen. 



Stenetrium serratum HANSEN, Proc. Zool. Soc. London, 1905, II, Pt. 2, pp. 

 323-324, pi. xix, figs. 3a-3d; pi. xx, fig. la. 



Locality. St. Thomas, West Indies. 



FIG. 497. STENETRH'M SERRATVM (AFTER HANSEN). O, HEAD. I), FIRST TWO THORACIC LEGS. C, TER- 

 MINAL PART OF SECOND LEG. d, TERMINAL PART OF FIRST LEG. , ABDOMEN. (ALL ENLARGED.) 



''Head has its upper surface (the frontal plate excluded) nearly 

 twice as broad as long; the lateral part is somewhat expanded and 



" The key given below is taken from Hansen' s Conspectus, given in Proc. Zool. Soc. 

 London, 1905, II, Pt. 2, pp. 316-317. 



