224 SILUEID^. 



process and dorsal ^ lenoth of head ; 

 maxillary barbel nearly as long as 

 head ; 20-23 gill-rakers on anterior 



arch ; D. 85-95, A. 65-75 . . .12. C.jaensis, Blgr., p. 242. 

 2. Head not more than 1| times as long as bi-oad. 



a. Maxillary barbel shorter than head ; head 1^-1^ as long as broad, its 



length 4-5 times in total length ; distance between occipital process 

 and dorsal §-§ length of head ; 10-13 gill-rakers on anterior arch ; 

 D. 65-78, A. 57-64. 

 Maxillary barbel |-f length o£ head, not 



reaching beyond gill-opening .... 13. C. carsonii, Blgr., p. 243. 

 Maxillary barbel | length of head, reaching a 



little beyond base of pectoral . . . . 14. C poemis, Blgr., p. 244. 



b. Maxillary barbel as long as or a little longer than head ; distance 



between occipital process and dorsal |-| length of head, which is 4-5 

 times in total length. 

 Head 11 as long as broad ; D. 75-84, A. 60- 



70; 10 gill-rakers on anterior arch . . 15. Csi/bmarghiatus^Vetevf^,]). 24:5. 

 Head l^-lg^ as long as broad ; D. 70-72, 

 A. 50-58 ; 13-15 gill-rakers on anterior 



arch 16. C liocepJialus, Blgr., p. 246. 



Head slightly longer thnn broad ; D. 58-60, 



A. 40-42 ; 20 gill-rakers on anterior arch. 17. C. hreviceps, Blgr., p. 24:7. 



c. Maxillary barbel once and .] to twice as long as head ; head I5-I3 as 



long as broad ; 12-15 gill-rakers on anterior aj'ch. 

 Length of head 4-4^ times in total ; distance 



between occipital process and dorsal l-\ 



lenoth of head ; distance between ventrals 



and caudal I3-I5 that l)etvveen end of 



snout and ventrals ; D. 70-80, A. 52-60. 18. C. icalkerl, Gthr., p. 248. 

 Length of head 5-5^ times in total ; distance 



between occipital process and dorsal |-f 



length of head ; distance between ventrals 



and caudal at least 1§ that between end 



of snout and ventrals ; D. 80, A. 70-73 . 19. C. lom/lor, Blgr., p. 249. 



B. Dorsal and anal in contact with or very narrowly separated from, but not 



adnate to the caudal ; maxillary barbel longer than head. 

 1. Nasal barbel at least as long as head, which is Ig-l^ times as loner as 

 broad; distance between occipital process and dorsal ^-.^ length of head. 

 a. Vomerine teeth conical or subgranular, in a crescentic band. 

 Length of head 35-41 times in total ; maxil- 

 lary barbel U-l§ length of head ; 20-25 

 gill-rukers on anterior arch ; D. 70-82, 

 A. 55-63 20. (?. anc/olensis, Stdr., p. 250. 



