On a new African Coretlira. 399 



of Arran are still preserved^ in excellent condition, in the 

 British Museum, and, with Dr. W. T. Caiman's kind assist- 

 tance, I was recently able to examine them. The third 

 uropods are very plainly to be seen, and, as might be expected 

 from the above statement, the inner ramus is as short as in 

 G. man'nus. In fact, and in the opinion of both Dr. Caiman 

 and myself, they are only distinguishable from G. mar'mus 

 by the S-shaped eyes. This is hardly enough to constitute 

 a distinct species — indeed, Spence Bate (Cat. Araph. Crust. 

 p. 209J says it " is a feature by no means to be depended 

 upon as a specific character. Among a considerable number 

 sent to me by Mr. Barlee (from the Shetlands) the eyes 

 were as frequently, if not more often, of a linear form." He 

 figures the third uropod correctly both in the above work 

 and in the Brit. Sess.-eyed Crust, p. 375, showing the inner 

 ramus less than half the length of the outer, yet concludes 

 his remarks in the latter work by saying that he considers 

 G. campylops to be identical with G. locusta (Lin.) of Lilje- 

 borg (' Ofversigt . . . . af slagtet Gammarus,' p. 448), in 

 which the inner ramus is described as about two-thirds 

 of the length of the outer ! The autennal characters are 

 not of much importance, and it is impossible to resist the 

 conclusion that G. campylops, Leach, is merely a variety of 

 G. marinus, Leach. 



It follows from the above that G. campylops, Leach, of 

 G. O, Sars (' Amphipoda of Norway,' p. 500, pi. 176. fig. 2), 

 is not that species. In addition to the character of the 

 third uropods, the type specimens are very much larger — 

 about 12 mm. Prof. Sars was probably misled by Leach's 

 mistake, and there is little doubt that his G. campylops is a 

 young G. locusta. In a specimen of the latter, from a 

 gathering of all ages examined by me, of the same size as 

 Sars's campylops (6 mm.), the lateral angles of the head are 

 almost rounded and the telson is armed with a single lateral 

 spine (both unlike the adult), exactly as shown in his invariably 

 accurate figures. 



I have to thank Dr. Caiman for much valuable assistance 

 in the above. 



L. — A new African Corethra. 

 By Fred. V. Theobald, M.A., F.E.S., &c. 



Corethra pallidipes, sp. n. 

 Head almost black, rostrum and palpi dark brown. 

 Thorax rich deep brown, pleurte ochreous and ochreous brown. 



