200 CYPBINID.E. 



Synopsis of the Species. 



I. Dorsal fin with a very strong, bony, non-serrated spine and 8 to 10 branched rays ; anal 

 with 5 branched rays ; scales multistriated., large, 28 to 40 in the lateral line ; barbels 

 four. 

 A. Lower lip continuous across the chin, sometimes produced into a median lobe. 



1. Interorbital width twice and a half to three times in length of head ; caudal peduncle 

 not more than once and two-thirds as long as deep. 



a. Depth of body much greater than length of head, twice and two-thirds to three and a 



half times in total length. 

 Spine of dorsal fin as long as head or longer, rarely a little shorter ; 



31 to 39 scales in the lateral line, 3 or 4 series between lateral 



line and ventral 1. B. bynni, Forsk. 



Spine of dorsal fin three-fourths to once length of head ; 29 to 33 



scales in the lateral line, 24 or 3 between lateral line and 



ventral 2. B. duchesnii, Blgr. 



b. Depth of body equal to or a little greater than length of head, three to four and one- 



sixth times in total length ; spine of dorsal fin one-third to three-fourths length of 

 head. 

 a. 32 to 36 scales in the lateral line ; barbels not longer than the eye. 

 Snout projecting considerably beyond the mouth ; 3 or 3^ series of 



scales between lateral line and ventral 3. B. loboyenys, Blgr. 



Snout projecting very slightly beyond the mouth ; 2 or 2\ series of 



scales between lateral line and ventral 4. B. radclijjii, Blgr. 



/3. 28 to 31 scales in the lateral line ; 2\ series of scales between lateral line and 

 ventral ; barbels longer than the eye. 

 Posterior barbel not more than once and a half the diameter of 



the eye 5. B. grudaricus, Blgr. 



Posterior barbel more than twice the diameter of the eye . . . . 6. B. eumystus, Blgr. 



2. Interorbital width three and one-fifth to four times in length of head ; caudal peduncle at 

 least once and a half as long as deep ; 29 to 37 scales in the lateral line. 

 a. No subtriangular dermal lobe above the mouth. 

 Depth of body three and a half to four times in total length, length 



of head three and two-thirds to four and a half times ; spine of 



dorsal fin shorter than head ; barbels subequal, one to one and 



a half diameters of eye 7. B. affinis, Hupp. 



Depth of body three and a half to three and three-fourths times in 



total length, length of head three and one-third to three and a 



half times ; spine of dorsal fin shorter than head ; anterior 



barbel shorter than eye 8. B. brevibarbis, Blgr. 



Depth of body three and three-fourths to four and a half times in 



total length, length of head four to four and one-fourth times ; 



spine of dorsal fin as long as or slightly shorter than head ; 



barbels subequal, as long as eye or a little shorter 9. B. leptosoma, Blgr. 



