On a new Genus and Species of Cleiidse. 95 



and 0. fjlomerosus, Alcock, the tentacles are relatively very 

 short. The tubercle representing the second dorsal rays in 

 0. megaceros is certainly not the result of any recent absorp- 

 tion of a large ray. A row of similar tubercles is apparently 

 present on tlie fore part of the back of 0. niger, and is shown 

 in Brauer's figure but not mentioned in the text. 



To the other species formerly referred to Paroneirodes, 

 Alcock (1890), and Dolopichthys, Garman (18i)9), but now 

 included by Alcock (1899) and Brauer (1906) in Oneirodes 

 (the original definition of which must in consequence be 

 modified by omitting all reference to the number and position 

 of the dorsal spines), 0. megaceros shows no very close affinity. 



Iteferences. 



Alcock. (1890.) Cat. Deep-sea Fishes in Indian Museum. 

 BouLENQKii. (1903.) C. K. Ac. Sci. cxxxvii. 523. 

 Brauer. (1906.) ' Valdivia ' Deep-sea Fishes. 

 Garman. (1899.) 'Albatross ' Expedition Fishes. 

 Gilchrist. (1904.) Marine Investigations S. Africa, iii. 



. (1906.) Marine Investigations S. Africa, iv. 



GtJNTHER. (1887.) ' Challenger ' Deep-sea Fishes. 

 LiJTKEN. (1871.) Overs. K. Dansk. Vidensk. Selsk. Forh. 6G. 



EXPLANATION OF PLATE III. 



Cyttosoma helgce, type, X \ ca., based on a photograph. 



XII. — Description of a new Genus and Species of Cleridse. 

 By C. J. Gahan, M.A. 



DiEROPSis, gen. nov. 



Eyes with a deep subtriangular emargination in front, 

 from which a line passes backwards almost up to the hind 

 border, dividing each eye into two jiarts : a more finely 

 facetted upper part and a more coarsely facetted lower part. 

 Antenna3 rather short, 11-jointed, the last three joints dilated 

 and compressed, forming a somewhat triangular club. 

 Labrum distinct, transverse, with a more or less deep sinuate 

 emargination in front. Last joint of maxillary and labial 

 palpi triangular. Prothorax with a more or less strongly 

 developed tubercle at the middle of each side. Elytra elon- 

 gate, somewhat parallel-sided, obtusely rounded at the apex. 

 Legs moderately stout, subcqual in length in the female, the 

 front pair greatly elongated in the male; the hind femora 

 much shorter than the abdomen ; tarsi moderately long, with 

 the first joint very short, the second a little shorter than the 

 two succeeding joints united j the claw-joint rather broad, 



