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8) 
Q FISHES OF WESTERN SOUTH AMERICA 
264. CREAGRUTUS BENI Eigenmann 
Creagrutus beni Eigenmann, 1912, Ann. Carnegie Mus., VIII, 172; 
Eigenmann, 1927, Mem. Mus. Comp. Zool., XLII, iv, 421, pl. Iviu, fig. 3; pl. xeiu, figs. 4, 
5 and 7; 
Pearson, 1924, Ind. Univ. Studies, no. 64, 45, Rio Beni; 
Pearson, 1937a, Proc. Cal. Acad. Sci., (4), XXIII, 92. 
Rio Beni to Colombia, Venezuela, and Rio Tocantins 
17600, 29, 43-74 mm., Balsas, upper Maranon, Pearson, 1922. 
17601, 12, 31-70 mm., Tingo de Pauca, upper Maranon, Pearson, 1922. 
17602, 83, 28-56 mm., Paipay, Rio Crisnejas, Pearson, 1922. 
Genus 101: MICROGENYS Eigenmann 
Microgenys Eigenmann, 1913, Ind. Univ. Studies, no. 18, 22; 
figenmann, 1927, Mem. Mus. Comp. Zool., XLII, iv, 353. 
Type: Microgenys minutus Eigenmann 
Upper Cauca and upper Maranon 
“Allied to Creagrutus and Bryconamericus, having the anal like the former, and 
the teeth like the latter.”’ 
265. MiIcROGENYS LATIVIRGATUS Pearson 
Microgenys lativirgatus Pearson, in EKigenmann, 1927, Mem. Mus. Comp. Zool., XLII, iv, 355; 
Pearson, 1937a, Proc. Cal. Acad. Sci., (4), XXIII, 91. 
Rio Pusoc, Upper Maranon, northern Peru 
17642, 4, cotypes, 56-71 mm., Rio Pusoc, Balsas, Pearson, 1922. 
Genus 102: CTENOBRYCON Eigenmann 
Ctenobrycon Eigenmann, 1908, Bull. Mus. Comp. Zool., LI, 94; 
EKigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 435; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 362; 
Eigenmann, 1927, Mem. Mus. Comp. Zool., XLII, iv, 330. 
Type: Tetragonopterus hauxwellianus Cope 
Rio Paranahyba and Amazons northward 
Separable from other tetragonopterines by its ctenoid scales, the cycloid scales 
on the sides of the young becoming ctenoid with age; compressiform; anal long, 
margin nearly straight; mouth very small, maxillary not reaching the eye; lateral 
line complete, a long tubular structure extended along the membrane of the mid- 
caudal; the latter naked. Maxillary teeth 2-9; a series of tricuspids on the pre- 
maxillary, and an inner series of 5-pointed ones, whose denticles are arranged in a 
U-shape, the premaxillaries in parallel series. 
