204 The South American Gharacinidse 



bbb. Scales in the lateral line 47. 



i. N^o teeth on the maxillary. A very distinct lateral, silvery band, 

 an indistinct caudal and hnmeral spot. Maxilliry extends to 

 the anterior margin of the orl)it. Depth 2. 2 in the length, eye 

 3 in the head, A. 47; scales 9 or 10-47—10 or 11. 



33. hauxwellianus. 



ii. Maxillary with a few rudimentary teeth near its articulation. A 



silvery lateral band present. Ventral profile much arched, 



snout pohited, A. 48 34. spilurus. 



aa. Anal rays 30-39 (abramis 28-31 ; lacustris 24-32 ; maximus 29-31 ; 

 melanurus 26-30) . 

 j. Lateral line with 45-47 scales. 



k. Anal rays -i?; scales in IS rows. Maxillary toothless, extends to 

 the eye. A black band extends from the base of the caudal fin 

 along its middle rays. Depth somewhat less than ^ of the body, 

 head \. Diameter of the eye | of the head, a little more than the 

 snout. Last dorsal rays over the anterior anal rays, A. 37 ; scales 

 6-46-7 35. brevirostris. 



kk. Anal rays less than 87. 



I. Caudal fin black, icith two large orange spots, scales in 11^ roics. 

 Dorsal over the ventral, the pectoral reaches to the base of the 

 ventral. Depth 3^-4 ; head 4-4^. Maxillary toothless, long 

 and narrow, extends to or nearly to the middle of the eye. A. 

 26-30, scales 7-45 or 46-4^ 36. melanurus. 



II. Caudal fin loithout orange sjjots, the black spot indistinct 07' want- 

 ing, scales in IS rows. An indistinct blackish humeral spot 

 which is sometimes wanting. Dorsal distinctly behind the ven- 

 tral, the pectoral reaches the ventral. Depth 2^, head rather 

 less than 4, A. 28-31, scales 10-43 to 47-8. ]\[axillary toothless, 

 extends somewhat beyond the anterior edge of the orbit. 



37. abramis. 



jj. Scales in the lateral line 36-43. 



m. Humeral and caudal si^ots present, 

 n. Maxillary toothed its entire length. 



Maxillary teeth distinct the maxillary extends nearly or entirely 

 under the middle of the eye. Depth 2^-3, head 4|-4§ ; eye 

 in head 3|-3^. A silvery band connects the caudal and hu- 

 meral spot. Anal under the middle of the base of the dorsal, 

 which is behind the insertion of the ventrals. D. 10 ; A. 29- 

 31, scales S to 9-39 to 40-6 or 6^ 38. jelsku. 



Maxillary teeth very small, the maxillary extending somewhat 

 beyond the front margin of the eye. Depth 2 to2f, head 4- 

 4i ; eye in the [head 3, in interorbital space 3-2^. A black 

 spot behind the shoulder, a black elongate blotch on the 

 caudal peduncle extending to the end of some of the rays, 

 these spots connected by a silvery line. D. 11. A, 32-33. P. 



