536 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 



no teeth on the tongue or maxillary and only tiny patches on the 

 vomer and palatine. The dentaries and premaxillaries each bear a 

 thin band of villiform teeth. The origin of the dorsal fin is a little 

 closer to the snout than to the base of the middle caudal rays. The 

 distance from the origin of the anal to the snout is contained 1.5 

 times in the distance from the origin to the base of the middle caudal 

 rays. 



Remarks. — This species is related to that group of species of the 

 genus that have more than 20 scales in a lateral series and also have 

 a distinct rostral spine. This group contains M. megcdops, M. macro- 



FiauRB 69.—Melamphaet runosu.i, new species: Holotype (U.S.N.M. no. 108141), 94 mm long, from station 



453D.T. 



cephalus, M. cristiceps, M. crassiceps, M. atlanticus, M. nigrqfvlvus, M. 

 unicornis, and M. triceratops. From M. megalops ^ it is distinguished 

 by the deeper caudal peduncle (2.4 as long as deep in M. rugosus, 4.0 

 to 4.5 in M. megalops); larger eye (5.8 in head in M. rugosus, 3.5 to 

 3.75 in M. megalops); and the more posterior insertion of the ventrals 

 (behind the pectoral base in M. rugosus, ahead of the base in M. 

 megalops). 



It is separated from M. macrocephalus ^ by the larger eye (5.8 in 

 head for M. rugosus, 8.5 to 9.4 for M. macrocephalus); wider interor- 

 bital space (2.1 in head in M. rugosus, 2.66 to 3.0 in M. macrocephalus); 

 and the more posterior insertion of the pelvics. 



From M. cristiceps ^ it is distinguished by the larger eye (5.8 in 

 head in M. rugosus, 7.0 to 8.5 in M. cristiceps); the wider interorbital 

 space (2.1 in head in M. rugosus, 3.25 to 3.5 in M. cristiceps); a.nd by 

 the smaller pectoral fin (13 rays in M. rugosus, 14 to 15 in M cris- 

 ticeps). 



From M. crassiceps ^ M. rugosus is distinguished by the size of the 

 eye (5.8 in head in the latter, 7.0 to 8.5 in the former); and by the 

 wider interorbital space (2.1 in M. rugosus, 3.25 to 3.5 in M. crassiceps). 



It can be told from M. atlanticus,^ to which it seems most closely 

 related, by the deeper body (3.4 in length without caudal in M. rugo- 



« Measurements taken from Parr, 1931. 

 • Measurements from Norman, 1929. 



