Fishes of the Order Cyprinodontes ii 



d-. — Membranous swelling along anterior margin of gonopodium modified into 

 a prepuce-like hood; ray 3 with at most a very small hook; ray 4 straight 

 or nearly so, with serrae only proximal to end of ray 5 ; ray 5 not arched 

 backward (see figures 5-7). Inner ventral rays abruptly shorter than the 

 second ray. (Tribe PoeciliinL)^ 

 f^- — Ray 5 with the last segment of the posterior branch not elongate, nor 

 sharply retrorse (see figure S). 

 g^- — Tips of all rays very slender; ray 3 with either serrae or a terminal hook, 

 h^- — Ray 3 serrate along anterior margin, not abruptly nor extensively 

 slender at tip, and without a trace of a terminal hook, 

 i^- — Anterior branch of ray 4 strictly entire on both margins; anterior 

 edge of ray 5 more or less roughened, but hardly spinous. .Poecilia. 

 i-- — Both branches of ray 4 serrate on posterior margin ; anterior edge 



of ray 5 with long spines (see figure 5) ]Veoi)oecilia,2T 



h--— Ray 3 without developed serrae, and abruptly narrowed distally to 



form a long, slender tip, which bears a terminal hook Limia. 



g-. — Tip of ray 3 and of posterior branch of ray 4 markedly clavate ; ray 3 



lacking both serrae and terminal hook Parapoecilia,"* 



f"-— Ray 5 with the last segment of the posterior branch elongate and abruptly 

 retrorse, entering the posterior profile of the gonopodium (see figures 

 6 and 7). 

 j^- — Ray 3 without processes on posterior margin; terminal hook of same 

 ray weakly or not at all developed. Fishes of minute size. 

 ^'^- — Tips of all the rays of the gonopodium slender; anterior as well as 

 posterior branch of ray 4 serrate on posterior margin ; serrae of ray 

 3 strong; terminal hook of ray 3 wholly undeveloped. Sexual dimor- 

 phism in color and size strongly marked Lebistes. 



k-. — Tips of ray 3 and of posterior branch of ray 4 clavate (but less so 

 than in Parapoecilia) ; posterior branch only of ray 4 serrate; serrae 

 of ray 3 weak; terminal hook of ray 3 often weakly developed (see 



figure 6). Sexual dimorphism slight AUopoecilia," 



j-. — Ray 3 with long, more or less spinous processes on posterior margin; 

 terminal hook of same ray always strongly developed; tips of all the 

 rays slender ; posterior branch only of ray 4 serrate ; serrae of ray 3, 

 strong (see figure 7). Larger fishes, with sexual dimorphism slightly 



marked (except in the development of the dorsal fin) Mollienisia. 



A=. — Lower edge of the caudal peduncle sharp, without a median series of scales. 

 Pelvic fins better developed in the male sex. Bones of lower jaw firmly united; 



teeth conical Tomeurinae. 



1^. — Pelvic fins well developed in both sexes, located behind the base of the pectoral 

 fins. Gonopodium very simple in structure, without appendages of serrae; ray 



3 with knob-like enlargement. Body rather deep. (Tribe Alfariiii)3" Alfaro 



1^ — Pelvic fins absent in female, minute and below gill opening in male. Gonopo- 

 dium with long appendages. Body elongate (tribe Tomeurini)."i. . .Tomeurus. 



-" Poeciliini Hubbs, new name (as a tribe name). 



-' Neopoecilia Hubbs, new genus. Orthotype, Ncopoccilia holacanthus Hubbs, new 

 species (based on the material recorded as Poecilia vivipara by Evermann and Marsh, 

 in Bull U. S. Fish Conim., 1900 (1902), p. 97). 



-* Parapoecilia Hubbs, new genus. Type species, Limia hollandi Henn, from Brazil 

 (Henn, Ann. Cam. Mus., 10, 1916, p. 138, fig. 17). 



-^ AUopoecilia Hubbs, new genus. Type species, Girardinus caucanus Steindachner 

 {Mollienisia caucana Henn, Ann. Cam. Mus., 10, 1916, p. 136, fig. 16). 



3<>Alfarini Hubbs, new tribe name. 



^'^ Tomeurini Hubbs, new name as a tribe name. 



