1000 MR. C. TATE REGA.N ON 



15. Onesterodon Garman. 



Mem. Mus. Comp. Zool. xix. 1895, p. 43. 



Gidapinnus Langer, Morph. Jahvb. xlvii. 1913, p. 207. 



Mouth small, but rami of lower jaw rather firmly joined and 

 teeth chisel-shaped, broader than in Pcecilia. Intromittent 

 organ long (nearly |- length of fish to base of caudal) ; last 

 segment of first produced ray an appendage which is not forked, 

 but is very long, peculiarly curved, and pointed distally ; second 

 ending in a process which is not or scarcely antrorse ; third 

 terminating in a hook, as in Gambusia. 



CxVESTERODON DECEMMACULATUS. (Text-fig. 172 B.) 



Pcecilia decemmaculata Jenyns, Zool. ' Beagle,' Fish. p. 115, 

 pi. xxii. fig. 1 (1842). 



Poecilia gracilis Ouv. & "Val. Hist. Nat. Poiss. xviii. 1846, 

 p. 133. 



Onesterodon decemmaculatus Garman, Mem. Mus. Comp. Zool. 

 xix. 1895, p. 44. 



Onesterodon carnegiei Haseman, Ann. Carnegie Mus. vii. 1911, 

 p. 385, pi. Ixxxiii. 



La Plata ; Rio Grande do Sul. 



A small species, easily recognized by the lateral series of dark, 

 rounded or vertically expanded spots. Dorsal 8-9 ; origin above 

 or a little behind that of anal. 



16. Glaridichthys Garman, 1896. 



Glaridodon (non Seeley, Proc. R. Soc. xliv. 1888, p. 135) ; 

 Garman, Mem. Mus. Comp. Zool. xix. 1895, p. 40. 



Glaridichthys Garman, Amer. Nat. xxx. 1896, p. 232. 



This genus is well distinguished by the dentition and by the 

 structure of the intromittent organ. It includes a single species 

 from Cuba and perhaps one from Chihuahua, but males of the 

 latter have not been described. 



1. Glaridichthys uninotatus. 



Girardinus uninotatus Poey, Mem. ii. pp. 309, 383 (1861); 

 Giinth. Cat. Fish. vi. p. 351 (1866). 



Glaridodon uninotatus Garman, Mem. Mus. Comp. Zool. xix. 

 1895, p. 41. 



Glaridichthys falcatus Eigenm. Bull. U.S. Fish. Comm. xxii. 

 p. 224, fig. (1904). 



Glaridichthys torralbasi Eigenin. t. c. p. 225, fig. 

 5 . Depth of body 3-1- to 41 in length, length of head 4 to 5. 

 Eye Itirge, more than i of length of head. 28 to 31 scales in a 

 longitudinal series. Dorsal 9-1 1 ; origin nearly equidistant from 

 head and base of caudal. Anal 10 ; oi-igin well in advance of 

 that of dorsal. Olivaceous ; edges of scales usually darker ; often 



