t8o 



1. Palate edentulous. P. 1.14 15, without distinct 



hyaline band C. oxycephalus p. 181. 



2. A few teeth on palatines. P. i.i 6, with a distinct 



hyaline band C. speculiger p. 181. 



B. Origin of anal far behind that of dorsal (Cypsi- 

 lurus s. sir.). 

 i. Pectorals dark with a hyaline transverse band. 



1. Head and body without bars. 



a. D. 13. A. 8. Ventrals white, the middle 



rays greyish C. arcticeps p. 182. 



b. D. 14 16. A. 9 ii. Distal half of ventrals 



and posterior half of dorsal black C. nigricans p. 183. 



c. D. 13. A. 10 12. Dorsal and ventrals uni- 

 form, dusky -, C. altipennis p. 184. 



2. Head and body with 6 brown cross bands. C. hexazona p. 185. 

 ii. Pectorals with rounded spots. 



1. Two barbels at corner of mouth C. bilobatiis p. 185. 



2. No barbels. 



a. A. 7 8. Distance of origin of dorsal from 

 first rudimentary rays of caudal much more 

 than length of head. 25 27 scales before 



dorsal. Teeth tricuspid C. poecilopterus p. 186. 



b. A. lo. Distance of origin of dorsal from 

 first rudimentary rays of caudal more than 

 length of head. About 40 scales before dorsal. 



Teeth simple C. atrisignis p. 187. 



c. A. 10. Distance of origin of dorsal from 

 first rudimentary rays of caudal equal to 

 or scarcely longer than head. About 30 



scales before dorsal. Teeth simple C. spilopterus p. 187. 



Hi. Pectorals without band or spots. 



1. A broad ribbon-like barbel at symphysis of 



lower jaw C. naresi p. 188. 



2. No barbels. 



a. Teeth on the palatines. 



1. Origin of ventrals nearer to branchial 

 opening than to caudal. 



a. Teeth tricuspid. A. 8 9. L.I 42 45. 



Dorsal without black patch C. oligolepis p. 189. 



ft. Teeth simple. A. 10 n. L.I. 48. 



Dorsal with a black patch C. bahiensis p. 190. 



2. Origin of ventrals nearer to caudal than 



to branchial opening C. opisthopus p. 191. 



