1890.] OF THE FAMILY BUTHID^. I'.i7 



' hand-back ' 2'3; of movable dactylus 5. (S . Total length 45 ; length 

 of cephalothorax 5; of tail 27, of first two segments 8, of fifth 6 ; 

 width of first and fifth 4 ; length of humerus 4'7 ; of brachium o'S ; 

 width of brachium 2 ; of hand 2 ; length of ' hand-back ' 3 ; of 

 movable dactylus 5"5. 



The Museum has two specimens of this species from Lake Nyassa 

 (Universities' Mission), and four ticketed merely E. Africa from the 

 collection of Capt. Speke. 



This form may be recognized from all its allies by the uniformly 

 green tint of the upper surface ; moreover, the superior lateral 

 margins of the fifth caudal segment are elevated behind, terminate 

 abruptly and not gradually as in the other species. The spine on 

 the inner surface of the hand points apparently to aflSnity between 

 this species and U. triangulifer (Plate XIII. fig. .5), of which the 

 Museum possesses a single male specimen from Pietersberg. But 

 the form of the vesicle in the J of triangulifer is sufficiently peculiar 

 to differentiate the species from all others. 



Rhoptrurus kirki, sp. n. (Plate XIV. fig. 1.) 



Colour almost a uniform ochraceous tint throughout, the terminal 

 segments of the tail and the dactyli of the palpi being somewhat 

 darker. 



Cephalothorax divided throughout by a median sulcus, lightly 

 emarginate in front, its posterior width greater than its length ; 

 closely but feebly granular throughout ; ocular tubercle prominent, 

 deeply and widely sulcate and perfectly smooth ; central eyes large 

 and separated by a space about equal to a diameter ; lateral eyes 

 three on each side. 



Tergites finely and closely granular throughout ; from the second 

 to the fifth armed with a low granular posterior median keel ; the 

 seventh with a low median keel in front, and two, more coarsely 

 granular, anteriorly abbreviated keels on each side. 



Sternites mostly smooth, the fourth granular laterally, the fifth 

 very feebly, if at all, granular in the centre, more coarsely so at the 

 sides, bearing traces of tour abbreviated granular keels. 



Tail very smooth, furnished only with exceedingly minute granules, 

 almost parallel-sided, the fifth segment being only slightly wider 

 than the first ; the first segment bearing traces of ten minutely 

 granular keels, the second and third segments with faint traces of 

 but eight keels, the fourth with scarcely perceptible traces of the 

 keels, and the fifth with scarcely perceptible traces of five keels ; 

 vesicle smooth above, minutely granular beneath, the spine beneath 

 the aculeus simple, large and sharp. 



Palpi. Upper surface of humerus minutely and closely granular, 

 bounded in front and l)ehind by a coarsely granular keel ; anterior 

 surface minutely granular and furnished with many larger tuber- 

 cles, inferior surface very finely granular, posterior surface more 

 coarsely granular; upper surface of brachium very finely granular 

 throughout and furnished with more coarsely granular keels ; 

 anterior surface also minutely granular and furnished with several 



