4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. CJl 



about two-thirds length of pectoral fin or slightly more than width 

 of isthmus. Branchiostegal rays 8, long, and recurved above and 

 before gill openings. Eye elliptical, notably longer than deep, slightly 

 greater than preoral length of snout, the superior rim slightly invad- 

 ing the dorsal profile. Orbit covered by thin transparent skin, with- 

 out free margin. Tongue long and narrow, only the tip and margin 

 free. Maxillary long, narrow, slightly bent downward below eye. 

 the posterior portion little expanded, reaching to vertical a little be- 

 hind posterior edge of eye. Head somewhat cavernous, the pores 

 large, slitlike, a small pair just behind extremity of snout, a large 

 linear pair above base of anterior nostril tubes, followed immediately 

 by a similar pair above toothless interspace, a pair above anterior end 

 of inner series of maxillary teeth, a pair below front end of posterior 

 nostrils and a pair below front rim of eye ; a series of 8 small round 

 ones across occiput from ends of the maxillaries ; a series of ii pores 

 along lower jaw from its symphysis to below the nape and 3 in a 

 vertical row joining the series of the straight portion of the lateral 

 line. There is a pair of small round pores on the snout just in front 

 of the superior rim of the eye and a larger pair midway between the 

 posterior nostrils and the extremity of the snout. The anus is situated 

 below the thirty-fourth pore of the lateral line and the fifty-first ray 

 of the dorsal fin. 



Head 6.3 to 6.8 in standard length; predorsal 5.7 to 6; preanal 

 2.5 to 2.7 ; pectoral fin 6.2 to 6.7 in head ; caudal fin 3.2 to 6 ; pre- 

 oral portion of upper jaw 4.3 in snout ; tip of snout to posterior nostril 

 3.2 to 3.3 in head ; length of snout 2.8 to 3.3 ; mandible 2 ; maxillary 

 1.7 to 1.9 ; gape 2 to 2.2 ; longitudinal diameter of eye 8.2 to 9 ; width 

 of body at vent 4.2 ; depth at same point 4 ; depth of head at occiput 

 4.2 to 4.5 ; width at same point 4 to 4.2 ; interorbital 5.5. to 5.8 in 

 snout ; branchiostegal rays 8. 



Color brownish above, lighter on sides and below, the belly with 

 a silvery sheen ; top of snout and interorbital much darker. Lower 

 jaw and throat light straw-colored ;. iris golden, with some dark pig- 

 ment. Pectoral and vertical fins light, with the dark marginal shad- 

 ing of the latter becoming black posteriorly ; the middle caudal rays 

 light brown ; peritoneum silvery white. 



The type is a female, with eggs about nine-tenths of a millimeter in 

 diameter. 



