1 64 Memoir Sears Foundation for Marine Research 



8 a. Greatest thickness of body usually exceeding depth of caudal 

 peduncle; depth 15.8— 25 "/o of SL; pectoral often failing to reach 

 base of pelvic by diameter of eye, 12 — i8''/o of SL; vertebrae 39—44, 

 most frequently 42. m.mitchiUi Hildebrand 1943, p. 176. 



8 b. Greatest thickness of body often less than depth of caudal peduncle; 

 depth I 8.2— 26.5''/o of SL; pectoral often extending to or nearly to 

 base of pelvic, i 3— 2o''/o of SL; vertebrae 38—42, most frequently 40. 



m. diaphana Hildebrand 1943, p. 176. 



lb. Anal fin with less than 25 rays {lamprotaenia occasionally with 25 or 26 rays, 



choerostoma rarely with 25); anal base 17.2— 25*'/o of SL {januaria sometimes 26). 



9 a. Pectoral without a long, filamentous ray (rarely with a slight filament in 



lamprotaenia)\ origin of dorsal fin usually nearer to base of caudal than to 



tip of snout, rarely equidistant. 



loa. Origin of anal in advance of base of last dorsal ray; depth of head at 

 joint of mandible exceeding postorbital length; snout much shorter 

 than eye; cheek shorter than snout and eye combined; silvery lateral 

 band much narrower than eye. 



1 1 a. Gill rakers on lower limb 23— 3 3, on upper limb 18—23 (rarely only 17). 

 12a. Depth of body i8.2-22''/„ of SL; pectoral fin 14-18. 5''/o 

 of SL; gill rakers rather robust, not closely crowded, not 

 difficult to count. 



13a. Origin of anal under or near middle of dorsal base; 

 depth of body 20-2 2''/(, of SL. 



14 a. Maxillary sharply pointed distally, extending 

 nearly to margin of opercle, 1.2 — 1.35 in head; 

 vertebrae 38—40 (rarely 41). 



parva (Meek and Hildebrand) 1923, p. 181. 

 14 b. Maxillary bluntly pointed distally, extending 

 only to or slightly beyond joint of mandible, 

 1.3— 1.5 in head; vertebrae 41 or 42. 



januaria (Steindachner) 1879, P- ^^3- 

 13 b. Origin of anal far behind middle of dorsal base; depth 

 of body 1 8.2-2 1 0/0 of SL. 



15a. Cheek as long as eye and fully 75 "/o of snout 

 length; pectoral fin 15.6-1 8.5''/o of SL; axillary 

 scale of pectoral about half of length of fin, 

 3.0—4.0 in head; anal with 22—24 rays. 



choerostoma (Goode) 1874, p. 185. 



15b. Cheek scarcely longer than eye; pectoral fin 



14— 14.8 "/o of SL; axillary scale of pectoral fully 



75''/o of length of fin, 1.9—2.75 in head; anal with 



18-22 rays. tricolor (Agassiz) 1829, p. 186. 



