82 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 9» 



3a, Caudal peduncle greatly compressed, its lower edge bladelike; fins, espe- 

 cially caudal and pelvic, pointed and often greatly attenuated; dorsal 

 rays about 10, origin considerably behind a vertical through anal 

 origin over the base of the fourteenth anal ray; anal ra3's 22; color in 

 alcohol dull yellowish brown with 11 narrow dark vertical bars on the 

 sides, the last on the caudal peduncle; caudal fin with small blackish 

 spots; scales about 34; pectoral rays 13; 12 scales from dorsal base to 

 anal origin; about 28 or 29 predorsal scales to opposite pupil; 16 around 



caudal peduncle Pterolebias zonatus Myers 



35. Lower edge of caudal peduncle not bladelike; cleft of mouth forming a 

 right-angled groove or pocket in front of eye; preorbital line nearly 

 vertical or even inclined slightly backward. 

 4a Dorsal rays 13 to 16; base of dorsal fin a little longer than that of anal 

 fin; dorsal fin origin a little behind that of anal fin, usually over 

 bases of first or second branched anal rays in females; anal rays 16 

 to 18; scales from upper edge of gill opening to caudal fin base 30 

 to 33 and usually 12 or 13 scales from anal origin to dorsal base; 

 teeth in each jaw conical, recurved, in a relatively wide band of 

 several irregular rows, the outer row considerably enlarged and 

 widely spaced; caudal fin slightly but usually truncate; interradial 

 membrane of caudal fin with fine scales in adults, lacking in half- 

 grown and young Austrofundulus Myers 



5a. Number of scales in a zigzag row across breast between bases of 

 pectoral fins about 5 or 6 and number of scales from lower edge of 

 pectoral base to pelvic insertion about 9; greatest width of upper 

 lip into length of upper lip between nostrils 3.8; length of pectoral 

 fin into standard length 6^^ times; coloration not known. 



Austrofiindulus transilis transilis Myers 

 56. Number of scales across breast between pectoral bases 7 to 11 and 

 from pectoral base to pelvic insertion 9 to 12; greatest width of 

 upper lip into length of upper lip 3.9 to 4.6; length of pectoral fin 

 into standard length 4.5 to 4.8; a dark bar below eye more or less 

 obscure on females; anterior parts of body with black spots faint 

 or absent on females; fins plain in color. 



Austrofxindulus transilis limnaeus, new subspecies 

 5c. Number of scales across breast between pectoral bases 10 to 14 and 

 from pectoral base to pelvic insertion 12 to 14; greatest width of 

 upper lip into length of upper lip 2.5 to 3.6; length of pectoral fin 

 into standard length 3.8 to 4.5; bar below eye barely visible; body 

 plain in color; basal parts of both dorsal and anal fins with 

 several darkish spots just visible, the row of 4 or 5 at base of 



fin most intense Austrofvmdulus stagnalis, new species 



46. Dorsal fin base much shorter than anal fin base; dorsal origin consider- 

 ably behind that of anal fin; all fins rounded, no produced pelvic 

 rays. 

 6a. Dorsal rays 8 to 10; head considerably wider than its greatest depth; 

 body but little compressed, elongate {Rivulus Poey). 

 7a. Scales from upper edge of gill opening to midcaudal fin base about 

 29; origin of dorsal three-fourths the distance from middle of the 

 eye to base of caudal fin; origin of anal halfway from head to 

 caudal; origin of dorsal nearly over middle of anal base; anal 



rays 6, dorsal 8 Bivulus obscurus Garman 



76. Scales 35 to 43; origin of dorsal usually a little behind middle of 

 anal base. 



