84 HAPLOMI. 



Cyprinodon eximius, Girard, Proc. Ac. Philad. 1859, p. 158 '; .lord. & Everai. 1. c. ' ; Meet, Publ. 



Columbian Mus., Zool. v. 1904., p. 125 '. 

 Cijprinodon latifascialus, Gavm. Bull. Mus. Comp. Zool. vii. 1881, p. 92', and Mem. Mus. Comp. 



Zool. xix. 1895, p. 22' ; .lord. & Evcnn. t. c. p. G76 " ; Meek, 1. c. '". 

 Cyprinodon elegans, ileelc, t. c. p. 125 ". 



Depth of body 2 to 2'\ in the length, leriglh of head 3 to 3|. Snout about as long as eye, the diameter 

 of which is 3^ to 4- in the length of head; interoi-bital -width 2| to 2| in the length of head. 20 or 27 

 scales in a longitudinal scries. Dorsal 9-11 ; longest rays equal to the base oF the fin or -| the lengtli 

 of head ( cO or less than the base of the fin and h the length of head ( $ ). Anal 9-11 ; longest rays 

 shorter than those of the dorsal. Pectoral ^ the length of head. Caudal truncate or subtruncate. 

 Least depth of caudal peduncle | the length of head. Coloration very variable, the males sometimes 

 spotted or barred, sometimes nuiforraly blackish : females spotted, the spots sometimes forming cross- 

 bars, sometimes a longitudinal lateral band ; vertical fins pale or dusty ; caudal, in the males, usually 

 spotted and with a blackish posterior edge ; females with a dark spot on the posterior part of the 

 dorsal. 



Hah. Kio Grande System and southwards to Durango : 



Leon Spring in Texas ^ ^ ; Colonia Juarez, Guzman, Santa Maria and Mifiaca 

 in Chihuahua 11; Eio Carmen and Rio Sauz in Chihuahua'^; Eio Conchos in 

 Chihuahua^ "^ ; Rio Chihuahua'*; Parras in Coahuila^; Labor and Durango 

 in Durango i". 



Here described from specimens measuring up to 60 mm. in total length from the 

 Rio Conchos [Woolman), determined as C. eximius and C. elegans by Dr. Jordan, 

 the Rio Sauz (Meek), and Labor (Meek). 



3. Cyprinodon variegatus. 



Cyprinodon variegatus, Lacep. Hist. Nat. Poiss. v. p. 486 (1803) ' ; Giinth. Cat. Fish. vi. p. 305 

 (1866) '; Garman, Mem. Mus. Comp. Zool. xix. 1895, p. 20'; Jord. & Everm. Bull. U.S. 

 Nat. Mus. xlvii. 1896, p. 672 '. 



Esox ovitins, Mitchell, Trans. Phil. Soc. N. York, i. 1815, p. 441, t. 4. fig. 7 '. 



Lebias rhomhoidalis, Val. in Humboldt's Obs. Zool. ii. ]). 100 (1817) °. 



Lehias elUpHoidea, Le Sueur, Jouru. Ac. Philad. ii. 1821, p. 5, t. 2. figs. 1-3 \ 



Cyprinodon fjibbosus, Baird & Girard, Proc. Ac. Philad. 1853, p. 390"; Girard, U.S. Mex. Bound. 

 Surv., Fish. [). 67, t. 37. figs. 1-7 ' . 



Trifarcias riverundi, Poey, Mem. ii. p. 306 (1861) '". 



Depth of body 2 to 2i in the length, length of head 3^. Snout a little shorter than eye, the diameter of 

 which is 3-3^ in the length of head ; interorbital width 2.| to 2| in the length of head. 26 or 27 scales 

 in a longitudinal series. Dorsal 1(J-11 ; longest rays e(iual to the base of the fin and nearly as Ion" as 

 the head ( rj ) or al)Out q the length of head ( 5 )• Aiud 10-11 ; longest rays considerably shorter than 

 those of the dorsal. Pectoral nearly as long as the head. Caudal truncate. Least depth of caudal 

 peduncle 'f^ the length of head. Body with more or less distinct dark vertical bars ; caudal lin in males 

 with a dark postirior edge ; females with a darjc spot on the posterior part of the dorsal. 



Ifab. Cape Cod to the Rio Cirande and Cuba, entering the sea : 



New York ^' ; Carolina i ; Florida '' ; Louisiana ^ ; Indianola in Texas '^ ^ • 

 Cuba i». 



