South- American Charaeid Fishes. 39H 



Synopsis of the Species. 



I. Deptli of body less than \ of the length ; caudal peduncle nearly a3 

 lon^ as Lead; origin of dorsal fin well behind base of pelvics. 



A. Origin of dorsal fin nearer to base of caudal than to head. 



1. arnoldi. 



B. Origin of dorsal fin equidistant from head and base of caudal, or 



a little nearer head. 



21 scales in a longitudinal series 2. callolepis. 



23 or 24 scales in a longitudinal series 3. eigennianni. 



26 scales in a longitudinal series 4. cmsevennensis. 



II. Depth of body not less than j of the length ; caudal peduncle 

 considerably shorter than head. 

 Origin of dorsal fin a little behind base of pelvics . . 5. guttata. 

 Origin of dorsal fin above base of pelvics 6. argyrops. 



1. Coptina arnoldi, sp. n. 



Depth of body 4^ to 4| in the length, length of head 4§ to 

 5. Caudal peduncle nearly as long as head. Snout shorter 

 than diameter of eye, which is 3^ in the length of head ; 

 interorbital width 2^. 23 or 24 scales in a longitudinal 

 series. Dorsal 10; origin nearer to base of caudal than to 

 head. Anal 11. Olivaceous; a dark stripe from eye round 

 lower jaw ; a blackish spot on dorsal Hn. 



Amazon. 



1-2. 30-40 mm. (types). Amazon. Arnold. 



2. Copeina callolepis, sp. n. 



PyrrTiulina nattercri (non Steind.), Eigenm. & Eigenm. Proc. Calif. 

 Acad. C2)ii. 1890, p. 112. 



Depth of body 4^ to 5 in the length, length of head 4^. 

 Caudal peduncle nearly as long as head. Snout shorter than 

 diameter of eye, which is 3 in length of head ; interorbital 

 width 2^ to 2^. 21 scales in a longitudinal series. Dorsal 

 10 ; origin equidistant from head and base of caudal, or 

 slightly nearer the former. Anal 11. Olivaceous; a dark 

 stripe from lower jaw to eye continued as a dusky band on 

 lower part of body ; a pale spot on each scale, except below 

 the band ; a black spot on the dorsal (in. 



Amazon. 



1-2. 35-40 mm. (types). Amazon. Arnold. 



3. Copeina eigenmanni, sp. n. '• 

 Depth of body 4:^ to 5 in the length, length of head 4 to 4^. 

 Ann. d- Mag. X. Hist. Ser. 8. Vol. x. 27 



