374 Mr. R. I. Pocock on 



of carapace 8, of tail 42, width of its third segment 7, length 

 6-5; width of brachium 3, of hand 4; length of movable 

 finger 9. 



Loc. Morocco (adult males and females collected by 

 Mr. F. G. Aflalo and received from the Zoological Society of 

 London) ; Tangiers {F. W. Frohawk) ; Mehedija, at the 

 mouth of the Sebu River {E. G. B. Meade-Waldo). 



The largest example of this species I have seen is a male, 

 measuring 75 raillim., taken by Mr. Meade-Waldo. 



This scorpion has probably been confounded hitherto with 

 one or the other of the black species of Buthus which occur 

 on the shores of the Mediterranean, and which have been 

 until lately confounded as one species under the name crassi- 

 cauda. In Journ. Linn. Soc, Zool. xxv. p. 308, I pointed 

 out that the Egyptian black scorpion, B. bicolo?', is quite 

 distinct from the Persian and Syrian form, B. crassicauda. 

 This opinion was adopted by Kraepelin in Das Tierr., 

 Scorpiones, p. 17 (1899) . But under the synonymy of bicolor 

 appears the name aneas, which was given by C. Koch to an 

 Algerian species. The British Museum, however, possesses 

 black scorpions from Algeria and Tunisia which must be 

 referred to ceneas, and these I find to be specifically distinct 

 from the Egyptian B. bicolor. The references and synonyms 

 of B. aneas are as follows : — 



Androctonus ceneas, C. Koch, Die Arachn. vi. p. 3, fig. 432 (1830) ( 2 ) ; 



id. in Wagner's Reiseu in Algier, iii. p. 218, Atl. pi. x. (1841) ( $ ). 

 Androctonus bicolor, Lucas, Expl, do I'Algerie, Zool. i. p. 271, Atl. 



pi. xviii. (1849J (d). 



Both B. bicolor and B. ceneas differ from B. crassicauda 

 and B. maurita?iicus in having the middle of the upperside of 

 the last abdominal tergum and of the first caudal segment 

 and to a lesser extent of the second finely and closely granular, 

 the granular area perhaps constituting a stridulating-organ 

 such as is found in the genus Parabuthus (see P. Z. S. 1892, 

 p. 222). The Egyptian form, B. bicolor, may be distinguished 

 from the Algerian B. ceneas by having the median lateral keel 

 strong and almost complete anteriorly upon the second and 

 third caudal segments, and the hand in both male and 

 female not wider than the brachium and of equal width in 

 loth sexes ; whereas in B. ceneas, to jndge from the small 

 number of specimens in the British Museum from Tunis and 

 Algeria that I refer to this species, the hand of the adult male 

 is longer as compared with the movable finger and thicker 

 than the brachium, and the median lateral keel is weaker on 

 the second caudal segment and almost absent on the third. 



