272 THE AMERICAN CHARACIDAE. 



mm. Five teeth in the inner series of the premaxillary. No humeral spot; 

 depth 2.5-2.75; eye 3.66-4 in the head; maxillary with 0-3 teeth, 

 extending considerably beyond anterior margin of eye; a conspicu- 

 ous black band on the caudal peduncle, becoming wedge shaped on 

 the caudal. A. 29-31 ; scales 7 or S-37 or 38-6. 



43. tnaximus (Steindachner) 

 mmm. Four teeth in the inner series of the premaxillary. A humeral spot. 

 Postventral surface broadly rounded. (Central America). 

 n. Depth 3.25; eye 3.25; interorbital 2.3; A. 27; scales 8-39-6.5; 



head broad, blunt, 5 in the length 44. regani Meek. 



nn. Depth 2.6; eye 3-|-, interorbital 2.3; A. 26; scales 7-38-7.5. 



45. albeolus Eigenmann. 

 II. Dorsal usually about equidistant from snout and caudal. Five teeth in 

 the inner series of the premaxiUary except sometimes in A. rivularis, 

 A. obscurus and A. aeneus. 



0. Two to seven multicuspid teeth in a rather compact row at the 

 anterior half of the maxillary. 

 p. Interorbital 2.4-3 in the head. 



46. nicaragiiensis Eigenmann & Ogle, 

 pp. Interorbital 3.33-3.5 in the head; 14-17 gill-rakers on the 



lower arch 47. angustifrons (Regan). 



00. One or two, rarely three, maxillary teeth. 

 ' g. Depth of caudal peduncle usually more than half the length 



of the head; usually a single tooth in the maxillary. 

 Depth 2.3-3. 

 r. Scales below the lateral line in series parallel with it. 

 s. Caudal band simple, median. .48. fasciatus (Cuvier). 

 ss. Caudal band median, a spur from its base extending 



downward 49. fasciatus heteritrus Eigenmann. 



rr. The series of scales below the lateral line deflected toward 



the anal by the interpolation of supplementary series. 



50. fasciatus parahybae Eigenmann. 



qq. Depth of caudal peduncle about half the length of the head; 



snout more or less pointed; maxillary 2 or ie.ss than 2 in 



the snout and eye; depth 2.75-3.33; eye 2.4-3 in the head, 



usually much greater than the interorbital; humeral spot 



not sharply defined. 



(. Occipital process more slender, maxillary a little 

 longer, not so sharply contracted, with one or two 

 narrower teeth. 



51. fasciatus jequitinhonhae (Steindachner). 

 tt. Occipital process equal to the snout or shorter; maxil- 

 lary shorter and broader, shaiply contracted above, 

 with a very broad tipped tooth, or two or three nar- 

 rower ones. . .52. fasciatus macrophthalmus Regan. 

 qqg. Depth of caudal peduncle usually less than half the length of 

 the head; maxillary rarely with as many as three teeth; 

 eye in adult 3 or more in the head, less than interorbital; 

 humeral spot large and conspicuous; A. usually 25-29. 



S3, fasciatus aeneus (Giinther). 

 dd. Anal with 17-24 rays (see also exceptions under d. p. 271). 



u. Caudal spot continued on middle caudal rays to 

 their tip. 

 I). Depth 2.3-2.7; five teeth in the inner series of 

 the premaxillary; snout usually pointed. 

 w. Dentary with abruptly smaller teeth on the 

 sides; depth of caudal peduncle scarcely 

 half of the length of the head; 12-15 scales 

 in front of the dorsal; A. usually 22-24. 

 64. mericanus (Filippi). 



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