94 



MEMOIRS OF THE CARNEGIE MUSEUM. 



51. Odontostilbe microcephala Eigenmann. 

 Odontostilbe rtiicrocephalus Eigenmann, Proc. U. S. Nat. Mus., Vol. XXXIII, 1907, 

 p. 10. 



Range : Paraguay and Upper Parana basins. 

 11086, 1. U. M., type, 46 mm. 11086, 1. U. M., paratype, 45 mm. Rio Pilco- 



mayo, Bolivia. Exchange with British Museum. 

 6854a-e, C. M., five, largest about 80 mm. (the caudal is broken), the longest 



on record for the genus. Rio Tiete at Salto Avanhandava below the falls. 



Sept. 15, 1908. Haseman. 

 6855a-p, C. M., sixteen, largest 33 mm. Rio Tiete, Salto Avanhandava 



above the falls. Sept. 14, 1908. Haseman. 

 6856a, C. M., one, 38 mm. Asuncion. March 28, 1909. Haseman. 

 Readily distinguished from the other members of the genus by the teeth, by 

 the elongate form and prominent caudal spot. 



Head 4-4.6; depth 3-4; D. usually 11, rarely 10; A. \^, ¥, ¥, ¥; scales 



Fig. 35. Odontostilbe microcephala Eigenmann. a, premaxillary; b, maxillary; 6^ left maxillary of 

 another individual; c, mandible. (All figures greatly enlarged). 



6-^, -0-, ■^, T^-4 or 5; eye 2.5-3 in the head, equal to or a little greater than the 

 interorbital, .6-.9 (in largest) in the snout; depth of the caudal peduncle 2.33-3 

 in the depth, .4 of its own length. 



Elongate; dorsal and ventral profiles similar; preventral area flat, with a 

 regular median series of fifteen scales; predorsal area rounded, with a median 

 series of eleven scales. Occipital process one-fifth to one-eighth in the distance to 

 the dorsal; frontal fontanel about 2.5 in the parietal; second suborbital and the 



