Henn: South American Pceciliid Fishes. 109 



_ 7 8 , 12 13 14 , , , 



U. — , -; A. — , — , — (the denominator represents the number of 

 13 I 3 II I 



individuals) ; scales 33-37 in a lateral series, 9 in transverse series. 



Origin of. dorsal over last three rays of anal, about twice as distant 

 from the operculum as from the base of the caudal, its height equal to 

 the length of the pectoral. Origin of anal slightly nearer operculum 

 than base of caudal. Ventrals small, equidistant from tip of snout 

 and base of caudal; their length equal to the diameter of the eye. 



General coloration of males (specimens from Condoto) light oli- 

 vaceous, center of each scale lighter, their edges forming longitudinal 

 stripes, belly whitish. Top of head dusky, an oblong dark spot under- 

 lying the operculum. All fins dusky, unspotted; anal with a clear 

 whitish border at the base, becoming darker outwardly, it and the lower 

 caudal margin edged with deep black. In females the dark longitudinal 

 stripes are broken by light patches, which form transverse oblong 

 blotches. The dorsal and caudal fins are heavily spotted and the 

 anal more lightly. In none of the specimens from the Rio Condoto 

 is there a caudal ocellus. In the specimens from the Rio Truando 

 almost half of the females possess a distinct caudal fleck and are much 

 darker. 



Rividus godmani Regan, of which I have examined numerous speci- 

 mens, recorded as R. elegans by Miller {Bull. American Mus. Nat. 

 Hist., Vol. XXIII, 1907, p. 104) from Los Amates, Guatemala, seems 

 only to dififer from R. elegans in having the dark edge of the lower caudal 

 lobe of the males broadened to form an intramarginal stripe with a 

 pale lower margin. 



4. Rivulus magdalenae Eigenmann & Henn, sp. nov. 



5813, C. M. Type, 56 mm. 5814 a-m, C. M.; 13603 I. U. M., 

 twenty-five paratypes, 24-62 mm. Ibague, (elevation 4,250 ft.). 



5815 a-h, C. M.; 13604 I. U. M., fifteen, 20-45 mm., Rio Guaduas, 

 Dept. of Cundinamarca. Gonzales. 



5816 a-b, C. M.; 13605 I. U. M., four, 25-46 mm. Rio Villeta. Gon- 

 zales. 



5817 a-h, C. M.; 13606 I. U. M., fifteen, 20-42 mm. Quebrada de 

 Chamisal. Gonzales. 



5818 a-h, C. M., two small specimens, 11-15 mm., probably belong 

 here. Boquia. Eigenmann. 



