84 PROCEEDINGS OF THE NATIONAL MUSEUM vol. » 



96. Anal fin of males modified, the first 3 branched rays or rays 3, 4, and 5 



greatly elongate with remarkably developed and specialized tips; dorsal 



origin in middle of length from caudal fin base and postoribtal part of 



head; teeth, minute conical, in villiform bands on jaws; depth and head 



more than 3 times in the standard length; pelvic fins enlarged and 



modified in the male, the first ray with a swollen tip, the second ray 



thickened and greatly elongate; a membranous swelling along anterior 



margin of gonopodium modified into a prepucelike hood (family 



Poecilidae). 



11a. Ray 3 of anal fin with retrorse spines along anterior margin, the 



proximal spine-bearing segments subspinous on posterior margin 



and no terminal hook; tips of all rays slender; origin of dorsal fin 



of female scarcely behind that of anal; subdistal segments of 



anterior branch of ray 4 short and spiniferous; processes of ray 5 



distinctly spinous; usually a blackish spot a little above midaxis 



near tip of pectoral fin; upper and lower edges of caudal fin base 



often edged with blackish; scale rows along side behind head to 



caudal fin base about 24 or 25. 



Poecilia vivipara Bloch and Schneider 



116. Ray 3 without processes on posterior margin and terminal hook weakly 



or not at all developed. 



12a. Spines on anterior margin of ray 3 strong but terminal hook wholly 



undeveloped; tips of all rays of gonopodium slender; anterior 



branch of ray 4 often with weak serrae on posterior margin; 



males variously black spotted and with black streaks, the females 



plain in coloration; scale rows head to caudal fin base 25 to 27; 



pectoral fins usually ii, 12; dorsal ii, 6; no black spot on dorsal 



fin and no vertical dark bars Lebistes reticulatus (Peters) 



126. Sides of males with vertical darkish bars, a little wider than pale 

 interspaces, these bars mostly absent on females, the width of 

 the dark bars about equal to that of pupil and usually two of 

 these dark bars beyond tip of depressed dorsal fin; dark bars 

 fading ventrally and dorsalh'; dorsal fin with a large black blotch 

 basally on posterior rays, base of anterior rays hyaline; middle of 

 dorsal fin hyaline, then tips of dorsal rays blackish; prepucelike 

 hood at tip of third anal ray usually blackish or grayish; about 

 26 or 27 scales; dorsal rays ii,6, anal iii,6 (Maracaibo Basin). 



Mollienisia caucana (Steindachner) 

 12c. Ray 3 with long more or less spinous processes on posterior margin; 

 terminal hook of ray 3 usualh"^ weakly developed; tips of all the 

 gonopodial rays slender; segments of anterior branch of ray 4 

 without trace of serrae and not markedly elongate; anterior 

 margin of ray 3 with strong spines; origin of dorsal approximately 

 over that of anal in female; dorsal and caudal fins with numerous 

 small black spots or in young a small blackish spot or group of 

 spots near midcaudal fin base; sides of body without or with 

 indistinct narrow vertical bars; about 26 or 27 scale rows; pectoral 

 rays usually ii,12 or 13; dorsal rays ii,6, anal iii, 6. 



Mollienisia sphenops vandepolli (Van Lidth de Jeude) 



Family ANABLEPIDAE 



Genus ANABLEPS Scopoli 



Anableps Scopoli, Introductio ad historiam naturalem, p. 450, 1877. (Genotype, 

 Cobitis anahleps Linnaeus.) 



