Jordan and Evermann. Fishes of North America. 699 



from eye to base of caudal. Dorsal (in female) much longer than high ; 

 anal small, opposite middle of dorsal. Brownish ; each scale with a black 

 posterior margin ; a black band between eye and scapula ; a round black 

 spot on upper half of root of caudal ; dorsal with 2 or 3 series of black 

 spots; anal with a black line behind and along each ray; other fins plain. 

 Length 3J inches. Lake Alcohuaca, a volcanic lake, Huamantla, Mexico, 

 8,000 feet above sea. Known from females only. (Giiuther.) (Named for 

 T. M. Rymer Jones, its discoverer.) 



Mollienesia jonexi, GUNTHER, Ann. Mag. Nat. Hist., xiv, 1874, 370, Lake Alcohuaca, Hua- 

 mantla, Mexico; JORDAN & GILBERT, Synopsis, 347, 1883. 



1039. fflOLLIEMSIA FORMOSA (Girard). 



Head 3i; depth 3; eye 3 in head. D. 12 or 13; A. 10. Body rather 

 stout. Snout short ; dorsal in male longer than high, its first ray about 

 opposite front of anal; female with the dorsal nearly as high as long, the 

 anal opposite its front. Olivaceous ; scales with brown spots ; dorsal fin 

 with transverse series of blackish spots ; other fins immaculate. Palo 

 Alto, Mexico. (Girard.) (formosus, comely.) 



Limiafonnosa, GIRARD, Proc. Ac. Nat. Sci. Phila., 1859, 115, Palo Alto, Mexico. (Coll. Clark.) 

 Mollienesia forwosa, GUNTHER, Cat., VI, 349, 186G; JORDAN & GILBERT, Synopsis, 347, 1883. 



1040. MOLLIENISIA LATIPINNA, Lo Sueur. 



Male : Head 4 ; depth 2f to 3. Female : Head 3 to 3f ; depth 2\ to 2$. 

 D. 15 or 16 (13 or 14 in var. lineolata*} ; A. 8; scales 26-9 or 10. Body 

 oblong, much compressed in males, of nearly equal height from dorsal 

 backward, the greatest height of body but i greater than that of caudal 

 peduncle; females with gibbous belly and narrower caudal peduncle; 

 head very small, depressed, not narrowed forward ; mouth very small, 

 vertical, and without lateral cleft ; length of mandible about $- diameter 

 of orbit ; teeth all very small, movable, in a rather narrow band ; the 

 outer series much larger than the others, but still very small, composed 

 of slender pointed teeth, strongly curved inward ; eye moderate, li to If 

 in interorbital width, equal to or slightly greater than snout, and 3^ to 

 3i in head. Dorsal very long, in adult males enormously elevated, 

 exceeding height of body ; the fin is almost square, the base slightly 

 longer than the height, the upper margin nearly straight ; longest ray 2 

 in length of body, the last ray reaching beyond base of caudal ; base of 

 fin 2J in body ; origin of dorsal distant from base of caudal 2*- times its 

 distance from the tip of snout. In females dorsal low, the longest ray 

 equaling length of head, the last ray reaching but halfway to base of 

 caudal ; the base of the fin 3| times in length of body, its origin distant 

 from base of caudal 1 times the distance from tip of snout. Anal very 



* Var. lineolata, GIRARD : Four female specimens and one male, from Galveston, Texas, (the 

 largest 2 inches long), and two females from Lake Pontchartrain, were formerly referred by us 

 to a variety lineolata (~ pwcilioides). Later investigations have not confirmed the validity of 

 this form. They show the following apparent differences from M. lalipinna : 



Eye email, the iris jet black; diameter of orbit 3> to 3% in head and 1% to 2 times in inter- 

 orbital width, (the eye 2% in head and Ig in iuterorbital Avidth, in laiipinna of the same size); 

 dorsal fin smaller, its base 3% in body in females, 3 in males, the rays constantly 13 or 14 in 

 number (usually 13); origin of dorsal equidistant from tip of snout and base of caudal in female. 

 Color as in latipinna, with traces of dark bars. 



