ANNOTATED LIST OF THE SPECIES 223 
adipose prominent; origin of dorsal fin near middle of the body; second suborbital 
in contact with the preopercle beneath. 
252. CERATOBRANCHIA OBTUSIROSTRIS EHigenmann 
Ceratobranchia obtusirostris Eigenmann, 1914, Ind. Univ. Studies, no. 19, 4; 
Eigenmann, 1927, Mem. Mus. Comp. Zool., XLII, iii, 356, pl. bxxxviii, figs. 2 and 3. 
The Chanchomayo valley of Peru 
13154, 1, 65 mm., type, Chanchomayo valley, Rosenberg (purchased). 
Elongate (depth 4.66 in the length); antler-like type of gill-rakers at the angle; 
humeral spot vertical, crossing the third and fourth scales of the lateral line; a 
dusky lateral band reaching to the ends of the middle rays of the caudal fin. 
253. CERATOBRANCHIA BINGHAMI Eigenmann 
Ceratobranchia binghami Eigenmann, 1927, Mem. Mus. Comp. Zool., XLIII, iv, 357, pl. xevi, fig. 1. 
Urubamba valley of southern Peru 
13561, 18758, 27, Urubamba at Santa Ana and Rio Comberciato, Heller. 
16049, many, 27-64 mm., Santa Ana, Rio Urubamba, Eigenmann, November, 1918. 
Lacking the antlered character of the gill-rakers in obtusirostris, and teeth 
distinctly unlike. 
Genus 98: BRYCONAMERICUS Eigenmann 
Bryconamericus Eigenmann, 1907, Ann. Carnegie Mus., IV, 139; 
Eigenmann, 1927, Mem. Mus. Comp. Zool., XLIIT, iv, 358. 
Type: Bryconamericus exodon Eigenmann 
Costa Rica to Argentina 
I am unable to separate this genus widely enough from its near allies such as 
Astyanax or Hemibrycon to warrant its removal to the subfamily Characinae in 
agreement with Gregory and Conrad. Small species not exceeding 132 mm., most 
prevalent toward the northern extremity of the range. Lateral line complete; 
caudal naked; second suborbital in contact with lower limb of the preopercle, not 
leaving a naked triangle below the suture between the first and second suborbitals. 
254. BRYCONAMERICUS GROSVENORI Eigenmann 
Bryconamericus grosvenort Eigenmann, 1927, Mem. Mus. Comp. Zool., XLII, iv, 365, pl. xcix, 
fig. 2. 
The basin of the Rio Urubamba, southern Peru 
31562 MCZ, 1, 58 mm., type, Rio Comberciato, Heller. 
7055 CM, 13757 IU, 16, the largest 60 mm., Rio Comberciato, Heller. 
7056 CM, 13761 IU, 9, the largest 40 mm., Santa Ana, Heller. 
16048, 4, about 35-68 mm., creek, Rio Urubamba, Santa Ana, Kigenmann, November, 1918. 
