4 



INDIANA UNIVERSITY STUDIES 



Lateral line complete, caudal with scales on its basal third ; adipose fin 

 well developed, origin of dorsal near middle of body ; second suborbital in 

 contact with the preopercle below ; premaxillary with two parallel series of 

 teeth, four teeth in each series, outer series more prominent. Teeth of 

 lower jaw graduate. 



'<^)btusirostris E'genmami, np. nov. 



131.14 I. X\ M. Type G.5 mm. Chauchamago, Peru. Purchased from Eosen- 

 berg. 



Plead l.Cil: depth 4.66; D. 10; A. 16; scales about 4-35-2; eye 3.33 

 in head, e(iua]s interorbital or opercle, longer than snout. 



Elongate, dorsal and ventral profiles very little arched, profile well 

 rounded, the mouth horizontal, terminal ; occipital only about 1/9 in the 

 distance to the dorsal; skull almost convex; no parietal fontanel; occip- 

 ital fontanel narrow, about two thirds as long as eye; second suborbital 

 considerably narrower than eye, leaving a naked area behind it ; maxillary 

 about .66 as long as eye, its first tooth forming a series with the outer 

 series of premaxillary ; premaxillary with an outer series of four teeth 

 of about equal size, each with three graduate lateral cusps and a dispropor- 

 tionately large median cusp ; three perfectly similar teeth along the upper 

 half of the maxillary, the first one as large as the maxillary teeth, the last 

 nbout one third as large. Teeth of the inner row of the premaxillary very 

 similar to those of the outer but smaller and the median tooth asymmetric. 

 Mandibulary ranrns with nine graduated teeth, very smilar to those of the 

 outer scries of the premaxillary, the median cusp much larger. 



Gill-rakers about 7-11. those near the vi\g\e three-pronged or with 

 lateral horns. 



Dorsal rounded, the longest ray e(iual to head less snout, adipose fin 

 well de-^ eloped ; caudal lobes about equal to tiie length of the head ; origin 

 of anal and last dorsal ray equidistant from snout; last anal ray consider- 

 ably in ad^-ance of the vertical from the adipose ; origin of ventrals more 

 than an orbital diameter in front of the dorsal, just reaching the anal ; 

 pectorals reaching ventrals. 



Scales large, thin, with numerous nearly parallel striae, regularly 

 imbricate, lateral line nearly straight; anal with a sheath formed of a 

 single series of scales ; basal portion of caudal scaled. 



A large vertical humeral spot crossing the third and fourth scales of 

 the lateral linc>; a dusky lateral band extending on middle caudal rays. 



Easily distiniiuished by its mouth, teeth, gill-rakers and shape. 



Bryconamericus cismontanus Eigenmann. sp. nov. 



54.10 C. M. Type. 60 nun. Villavicencio, Manuel Gonzales. Allied to B 

 Uicrinf/ii differing in the teeth, anal, etc. 



Head 3..S ; depth 3; D. 10; A. 16; scales 5-37-4; eye 3, equal to inter- 

 oibital ; depth of caudal peduncle 1.5 in its length, 2 in the head. 



Compressed, head slender, snout blunt ; predorsal area with a median 

 series of of ten scales ; occiptal process about one seventh of the distance 

 between its base and the dorsal; bordered on the side by two scales; 



