2255 
D. Ill, 11, I, first branched ray 1 1/8 to 1 1/6 in head; adipose fin 
3 1/4 to 3 2/5; A. Ill, 13, I, first branched ray 1 1/2 to 1 3/5; caudal 
subequal with head, deeply emarginate; least depth of caudal 
peduncle 2 1/4 to 2 1/2; pectoral 1 7/8 to 2 l/lO; ventral 1 1/5 to 1 l/2. 
Dark brown generally, especially where scales have fallen, entire 
sides and lower surfaces dusted with minute dusky dots. Scales burnished 
with silvery white, iridescent, especially sides of head and iris. 
Antorbital luminous organ pale yellow with black investing membrane. Fins 
whitish# 
Diagnosis . Close to Diaphus latus Gilbert but apparently differs in 
the slightly lower supraventral photophore, larger eye, longer head and more 
posteriorly inserted fins. This species is also suggestive of Diaphus 
drachmanni Taaning from the Indian Ocean, but with little different 
arrangement of the photophores. 
Type No. U. S. N. M. 
East Indies, Philippines. The material listed below is greatly 
suggestive of Diaphus coeruleus (KLunzinger) as figured by Brauer. Most 
of the specimens differ in the larger eye and longer head. The dorsal and 
ventrals also seem to be more posteriorly inserted. The position of the 
first and second supraanal photophores always holds, especially that of the 
first so that it often really impinges in the course of the lateral line. 
/ 
This is quite at variance with Brauer’s figure of Myctophum (Diaphus 
coeruleum. 
