1 64 Memoir Sears Foundation for Marine Research 



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



peduncle; depth i5.8-25''/o of SL; pectoral often failing to reach 



base of pelvic by diameter of eye, 12-1 8 "/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. 2-2 6. 5 "/o of SL; pectoral often extending to or nearly to 



base of pelvic, 1 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 i7.2-25"/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. 



10 a. 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 2 3-3 3, on upper limb 18-23 (rarely only 1 7). 

 12a. Depth of body i8.2-22''/o 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 20-22 o/^ of SL. 



14a. 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. 183. 

 1 3 b. Origin of anal far behind middle of dorsal base ; depth 

 of body 18.2-210/0 of SL. 



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



length; pectoral fin i 5.6— i8.5''/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. 



