Pacific area and much of the Indian Ocean) will show the above slight differences in mor- 

 phometry and counts to be clinal and require the return of S. panamense to subspecific status 

 or to synonymy with B. pterotum. 



Diogenichthys 



Bolin, 1939 



SAO series in a steeply oblique line, usually with SAO.^ well behind a line through SAO,.; 

 VOj elevated but not displaced forward. One Pol, at lateral line; 2 Pre, on same level. Dn 

 present; Vn absent. 



Key to species of Diogenichthys 



la. 



lb. 



Upper jaw reaches well behind a vertical from hind margin of orbit. VLO no higher, 

 usually noticeably less, than midway between lateral line and ventral profile of body. Pre 



interspace much less than thatof AOp-Prc D. laternatus 



Upper jaw scarcely reaches a vertical from hind margin of orbit. VLO no lower, usually 

 noticeably higher, than midway between lateral line and ventral profile of body. Pre 

 interspace as wide as thatof AOp-Prc D. atlanticus 



Diogenichthys laternatus 



(Carman, 1899) 



Fig. iO— Diogenichthys laternatus. From Bolin (1939, p. 120, fig. 15i. (A) adult 

 female, (B) head of adult male, (C) caudal peduncle of adult male. 



Description 



D. 11 (10-12); A. 16 (15-17); P. 11(10-12); AO 6 (5-7) + 2-3, total 8-9 (7); gill rakers 3 (4) -H 

 1 -I- 9-10, total 13-14; vertebrae 30 (29-31). 



Upper jaw reaches well beyond a vertical from hind margin of orbit. VLO usually nearer 

 pelvic base than to lateral line. SAO, over or slightly behind VO4. SAO., usually well behind a 

 line through SAO 1.2. Dn of males much larger than Dn of females. 



Supracaudal glands of adult males (Fig. 40C ) large, undivided, occupying over half the 

 dorsal surface of caudal peduncle. Infracaudal glands of females (Fig. 40A) small, usually of 

 two coalesced spots, beginning about under Pre, and extending halfway or slightly less to last 

 AOp. 



Size: To about 25 mm. 



Least depth of capture: 0-100 m at night, 600-650 m in daylight. 



46 



