8. C'.ENOTROPrS. 29/ 



1 2. Prochilodus taeniurus. 



Curiniatiis treniurus, Valeiic. in Iluiitb. ObticnK Zuol. ii. p. 166. 

 Prochilodus tasniiirus, Cui\ df Val. xxii. p. 86. 



L. lat. 76. Caudal fin with a black medial streak, and ydih. three 

 oblique black bands on each lobe. ( Val.) 

 Brazil? 



8. C^NOTROPUS. 



Cbilodus, Miill. ^ Trosch. Hot: Ichth. i. p. 10. 



Chilodus et Microdus*, Kner, Denkschr. Acad. Wien, 1859, xvii. 

 pp. U9, 151. 



Dorsal fin placed nearly in the middle of the length of the body, 

 above the ventrals ; anal short. Body oblong, covered with large 

 scales ; belly not compressed. Cleft of the mouth small ; teeth rudi- 

 mentary, moveable, in a single series, in one species in both lips, in 

 the other in the upper only ; palate tootliless. NostriLs close toge- 

 ther, separated by a smaU lobe covering the posterior. Gill-openings 

 rather narrow, the gill-membranes being grown to the isthmus, with- 

 out free posterior edge. The suboperculum angular behind. The 

 fourth branchial arch dilated, convex behind and concave in front, 

 the convex side covered with a mucous membrane, which is trans- 

 versely folded. 



Guiana, Erazil. 



1. Caenotropus labyrinthicus. 



Chilodus labjTinthicus, Kiter, Denkschr. Acad. Wiss. Wien, 1859, xvii. 

 p. 149. taf! 3. fig. 5. 



D. 12. A. 9. V. 10. L. lat. 28. L. transrv. 4/4. 



Teeth in the upper lip only. The length of the head is one-fourtli 

 of the total (without caudal). A broad silvery band along the middle 

 of the side ; a brownish spot above the pectoral ; each scale above 

 the silvery band with a small bi'own spot at the base. 



Amazons. 

 a. River Cajiin. Purchased of Mr. Stevens. 



2. Cssnotropus pimctatus. 

 Cbilodus pimctatus, Midi. &: Tm.svh. llor. Ichth. i. p. 26. taf. 4. fig. 2; 



Kncr, Denkschr. Acad. Wiss. Wien, 1859, xvii. p. 151. 

 C'ithariiuis cbilodus, Cnv. ^- Val. xxii. p. 103. 



D. 1 1 . A. 1 2-13. V. 9-1 0. L. lat. 25. 

 Teeth in the lower lip as well as in the upper. The length of the 

 head is a little more than one-fom-th of the total (without caudal). 

 Each scale with a small bro\ra spot at the base. A blackish band 

 along the side below the lateral line. Dorsal fin with small black 

 spots, and \\'ith a larger one anteriorly neai' to its top. 

 Lake Anmcu (Guiana). 



* Btitli these names are preoccupied. 



