52 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



i. Body deep, comxnessed ; depth 3^ to 3| in length : tins all greatly elevated; the 

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

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

 bri"-ht scarlet: posterior margin of caudal blackish; no black spot at 

 base of caudal pyrkhomelas, 2. 



bb. Body more elongate, less compressed, its depth 4 to 4;^^ in length : fins all rather 

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

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



a faint black caudal spot xjsnuka, 3. 



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



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

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

 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 ferrugiuous-oraugc ; 

 a blue streak along sides : size small ; length '2| inches., .callkskma, 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 

 tin. 

 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 bodj^ tubercnlate, except the 

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

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

 ches CHLOKISTIA, 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 2f inches cjekulea, (i. 



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

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

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

 jaw the shorter: scales large; size large: length^ inches, stigmatura, 7. 

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

 spot, less distinct than in C. siigmatura. 

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

 ing to opposite the eye and Ihe 2)rcmaj:iUarit'.s anUriorlt/ 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- 

 milliou : caudal peduncle tubercnlate: dorsal markings usually distinct 



in both sexes : size small ; length 2| inches trichkoistia, 8. 



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

 not reaching to the eye, and the 2)remaxiUaries 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 tlie dorsal fin in the form of a horizontal bar across the fin 

 midway: body stout and deep, not greatly compressed: head he.ivy : 

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

 tinct black caudal spot : fins with pae red : teeth sometimes 1, 4-4, 2: 

 size large ; length 4 inches : appearance of Luxilus eurystoma, 10. 



