ART. 10 NOTES ON MYCTOPHINE FISHES PAKR 15 



or more, of the entire height of the caudal peduncle. The fact that 

 the said species was referred by Goode and Bean, 1895, to the genus 

 LaTnpanyctus, in the restricted sense in which this generic designa- 

 tion was employed by the said authors to embrace only the species 

 which combined among other characters the feature of having the 

 scales of the lateral line " scarcely larger than the others," is there- 

 fore inexplicable,^* and has caused the author previously to redescribe 

 the species under the name of L. nwlanothorax. The specimens re- 

 ported by Waite, 1910, as having the lateral line scales only scarcely 

 enlarged may possibly pertain to another species, if a similar mis- 

 leading use of these descriptive terms has not also been made by 

 Waite. 



The type specimen of L. giintheri is in all other respects quite con- 

 cordant with the material of L. melanothorax Parr previously re- 

 ported upon (see Parr, 1928, p. 99), as will appear from a comparison 

 of the accompanying diagram of the former with the figure and de- 



FiGUBB 5. — Type specimen of Lampanyctus guntheri Goode and Bean. 

 Supra- and infra-caudal luminous scales lost 



scription of the latter {Joe. dt.). Most of the luminous scales, the 

 second and third Pre, and possibly the sixth postero-anal organ have 

 become lost, however, in the type of L. giintheri., but there is no reason 

 to assume that these organs, when present, would have differed from 

 those of the nominal L. melanothorax. 



The species has been recorded from Atlantic and Australian waters, 



L. gaussi Brauer 1906, which has been identified with L. guntheri 



by Taaning 1928, differs according to Brauer's description in having 



6 VO and a luminous scale at the base of ventral fin, while only 5 VO 



and no luminous scale in the said position are found in L. guntheri. 



LAMPANYCTUS MEXICANUS Gilbert, 1891 



Myctophwm mexicaniim Gilbert, 1891. 

 Na/nnoirachmm mexicanuin Jokdan and Evermann, 1896. 

 Myctophum (Lampanyctus) mexicanitm Brauee, 1906. 

 Lampanyctus mexicanus Parr,, 1928. 



Material investigated. Type specimen No. 76343, U.S.N.M. From 

 the Gulf of California. 



"The original illustration of the species (Goode and Bean, 1895, flg. 90, pi. 24) is also 

 entirely misleading in this respect. 



