52 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



&. Body deep, compressed; depth 3| to 3f in length : fins all greatly elevated; the 

 height of the dorsal five-sixths the length of the head : muzzle, anterior 

 part of dorsal fin, and a bioad crescent in the middle of the caudal fin 

 hright scarlet: posterior margin of caudal blackish; no black spot at 



base of caudal PYRRHOM ELAS, 2. 



6&. Body more elongate, less compressed, its depth 4 to 4 in length : fins all rather 

 low, the longest dorsal ray scarcely length of head : dorsal, anal, and 

 caudal fins chiefly bright crimson: no definite dark margin to caudal: 



a faint black caudal spot X^ENTJRA, 3. 



Section II. Anal fin short, its rays 1, 8, or 1, 9. 



* Teeth one-rowed, 4-4. Dorsal fin scarcely at all posterior to ventrals, its first ray 



nearer snout than base of caudal : body elongate, compressed : mouth 



smallish, oblique, rather inferior : dorsal fin greatly elevated, the longest 



ray, in males, longer than the head : black dorsal blotch well marked: 



dorsal, anal, and caudal fins chiefly of a br;ght ferruginous-orange; 



a blue streak along sides : size small ; length 2f inches.. .CALLISKMA, 4. 



** Teeth two-rowed, 1, 4-4, 1 (often 1, 4-4, 2, in C. eurystoma)* 



c. Black markings of the dorsal fin not in the form of a horizontal bar across the 



fin. 



d. Adult males without red markings on the fins. 



e. No distinct black or dark blue spot at base of caudal : body short and deep, 

 strongly compressed : fins not greatly elevated, the dorsal largely of a 

 bright lustrous pale green : black dorsal markings distinct : a bluish 

 streak along sides : males with the whole body tuberculate, except the 

 space anterior to the ventrals and below the lateral line : head pointed : 

 mouth oblique, the upper jaw projecting: size small; length 3 in- 

 ches CHLORISTIA, 5. 



ee. A rather faint dark blue caudal spot, preceded by a very distinct lateral 

 band of clear blue : sides chiefly blue and silvery : fins clear yellow, the 

 black markings obscure : body slender : mouth small : fins not greatly 

 elevated : size small ; length 2 inches , C^BRULEA, b*. 



eee. A large, very conspicuous jet-black spot at base of caudal : body elongate, 



moderately compressed : color pale olivaceous or bluish: sides silvery : 



fin-markings rather obscure : fins rather low : mouth oblique, the lower 



jaw the shorter : scales large ; size large : leugtb.4 inches. . STIGMATURA, 7. 



dd. Adult males with the vertical fins chiefly red : a well-marked black caudal 



spot, less distinct than in C. stigmatnra. 



f. Mouth largo, quite oblique, the jaws about equal, the maxillary reach- 

 ing to opposite the eye and 1he premaxillarles aiihriorly on the level of 

 the pupil : body slender, compressed : dorsal fin dusky at base, jet-black 

 on last rays, the fin otherwise, as well as the anal and caudal pale ver- 

 million : caudal peduncle tuberculate: dorsal markings usually distinct 



in both sexes : size small; length 2f inches TRICHROISTIA, 8. 



ff. Mouth nearly horizontal, overlapped by the heavy snout, the maxillary 

 not reaching to the eye, and the jyvmoxtllanes anteriorly below the level 

 of the orbit : dorsal fin dusky at the base and on the last rays, the greater 

 part of the fin, as well as of the caudal, bright carmine : coloration of 

 body quite dark, blue in males, olive in females : dorsal markings obscure 

 in the latter: body stout, not greatly compressed, the back somewhat 



elevated: size large ; length 4 inches CALLISTIA, 9. 



cc. Black markings of the dorsal fin in the form of a horizontal bar across the fin 

 midway: body stout and deep, not greatly compressed: head heavy: 

 mouth large, oblique, with equal jaws : eye very large ; a small but dis- 

 tinct black caudal spot: fins with pa'e red : teeth sometimes 1, 4-4, 2: 

 size large; length 4 inches : appearance of Luxihis EURYSTOMA, 10. 



