996 MR. C. TATE REGAN ON 



PSEUDOP(ECILIA FEST^. (Text-fig. 170 F.) 



PceciUa festce Bouleng. Boll. Miis. Zool. Torino, xiii. 1898, 

 No. 329, p. 13. 



Santa Elena, Western Ecuador. 



10. PcECiLioPSis, gen. nov. 



This genus has the mouth and dentition of PceciUa, but in the 

 males the pelvic fins are neither enlarged nor modified, and the 

 intromittent organ is long and slender. The first prolonged ray 

 and the anterior branch of the second extend to the end of the 

 fin and are somewhat curved forward distaUj'' ; the posterior 

 branch of the second is short and the third still shorter and 

 slender distally, so that the serrations of the second project 

 beyond it (text-figs. 170 D and 171 B). 



Mexico, Central Ameinca, and Colombia. 



Synopsis of the Species. 



1. Dorsal origin behind that of anal. 



Sides of body with a series of vertical bars 1. presidionis. 



A lateral series of spots, usually more than 8 in number and 



smaller than the ej'e 2. Jnfzi. 



A lateral series of 4 to 8 spots, each about as large as the eye 3. pletirospilus. 



No bars or spots 4. retropintia. 



2. Dorsal origin in advance of that of anal. 



Diameter of eye 3 to 3^ in length of head, which is 3^ to 3| in 



the length of fish 5. istlimensis. 



Diameter of eye 2^ to 2% in length of head, which is 4 to 4:\ in 



the length of fish 6. pittieri. 



1. PCECILIOPSIS PRESIDIONIS. (Text-fig. 170 D.) 



PceciUa presidionis Jord. & Culver, Proc, Calif. Acad. (2) v. 

 1895, p. 413, pi. xxix. 



Oirardinus jjresidionis Regan, Biol. Centr.-Amer., Pisces, p. 99 

 (1907). 



As I have stated in the ' Biologia ' bhis form and the next seem 

 to difl^er from P.pleurosjnhis only in coloration, and should perhaps 

 be regarded as subspecies of that species. 



Rio Presidio in Sinaloa. 



Heterandria colomhiaiius Eigenm. (Indiana Univ. Studies, 1912, 

 No. 8, p. 27), from brackish water at the mouth of tlie R. Da,gua, 

 Colombia, seems to be extremely similar to P. presidionis. 



2, PCECILIOPSIS LUTZI. 



Heterandria UUzi Meek, Publ. Colombian Mus., Zool. v. 1904, 

 p. 148, fig. 47. 



Girardinibs Uitzi Regan, Biol. Centr.-Amer., Pisces, p. 99 

 (1907). 



Oaxaca, Mexico ; R. Motagua in Guatemala, 



