AET. 10 NOTES ON MYCTOPHINE FISHES PARR - 31 



DIAPHUS DUMERILI Bleeker, 1856 



Scopelus dumerili Bleeikek, 1856. 



Lampanyctus lacerta Goodb and Bbia.n, 1895. 



Diaphus nocturnus (Poey) Gilbert, 1906. 



DUiphus dumei-ili Pabb, 1928 (with earlier synonymy) ; Fowler, 1928. 



Material investigated. Type specimen of Larrfpanyctus lacerta 

 Goode and Bean, 1895, No. 43778. 



An inspection of the type specimen of Goode and Bean's Lojni- 

 panyctus lacerta can only serve to confirm in every detail its perfect 

 identity with the species now designated as Diaphus dumerili 

 Bleeker according to Weber and Beaufort, 1913. (See Parr 1928, p. 

 126.) 



D. dumerili differs from D. agassi^i Gilbert and D. urola/mpus 

 Gilbert and Cramer in the possession of a minute suborbital organ, 

 which is always present, but sometimes difficult to make out. D. 

 dumerili has its VLO situated approximately midway between the 



Figure 15.— Diaphus nipponensis Gilbert 



lateral line and the base of ventral fin or, more frequently,' some- 

 what above this point.^^ 



The species has been very adequately described and figured by 

 Gilbert, 1906 (p. 255 and pi. 1) under the name of '■''Diaphus noc- 

 turnus Poey," and has been further discussed in various details by 

 Weber and Beaufort, 1913, and by Parr, 1928. 



Recorded from the Atlantic and from East-Indian waters. 



Taaning, 1928 (p. 58) designates the Atlantic material of D. 

 dimierili as D. dv/merili nocturnus^ without discussing the differences 

 by which this subspecies can be distinguished from the East Indian 

 form. 



DIAPHUS NIPPONENSIS Gilbert. 1913 



Material investigated. Type specimen No. 74467, U.S.N.M. 

 This species has been adequateh^ described by Gilbert, 1913 (p. 86), 

 and correctly defined in the previously rendered key. 



^ This feature is not always quite reliable for the differentiation of groups 1 and 2, 

 Division II A in the key previously given hy the author (Parr, 1928, p. 115) and the 

 main significance should therefore in this case be attached to the positions of the upper 

 SAO and the Pol as described In the same key. 



