38 MEMOIRS OF THE CARNEGIE MUSEUM. 



dorsal behind the middle, about over the vertical from the origin of the anal; 

 adipose fin well -developed; anal falcate, with fewer than forty rays, its origin 

 nearer caudal than snout, first and second developed rays filigerous, curved; 

 pectorals placed low, long and falcate, their margins nearly along the edge of the 

 compressed belly when the fin is closed; caudal naked; lateral Une incomplete; 

 mouth very oblique; profile from tip of snout to near dorsal straight; two post- 

 orbitals, similar to those in ApJnjocharax, the lower large, the upper minute, some- 

 times a minute triangular wedge between the third suborbital and the postorbital, 

 representing the lower postorbital of other genera; third suborbital covering the 

 entire cheek; no well-defined pseudo tympanum. 



Key to the Species op Phionobram.-v. 



a. Lateral line 35-38; eight or nine scales between ventrals and dorsal; anal rays 29-34. 



15. paraguayensis (Eigenmann). 

 aa. Lateral line 38-41; nine or ten scales between ventrals and dorsal; anal rays usually 32. 



16. fiUgera (Cope). 



15. Prionobrama paraguayensis (Eigenmann). (Plate IV, fig. 5.) 

 Bleptonema paraguayensis Eigenmann, Indiana University Studies, No. 20, 1914, 



p. 44 (Corumba). 



Range : Uruguay and Paraguay basins. 



6884a-b, C. M., two, largest about 50 mm. Corumba, May 9, 1909. Haseman. 



6885a, C. M., one, about 42 mm. Puerto Suarez, May 6, 1909. Haseman. 



6886a & b, C. M., two, largest 45 mm. Villa Hays, April 11, 1909. Haseman. 



6887a-c, C. M., three, largest 42 mm. Asuncion, March 29, 1909. Haseman. 



6888a-j, C. M., ten, largest 49 mm. Arequa, April 8, 1909. Haseman. 



847, M. C. Z., four, largest 35 mm. Uruguay River. Wyman. 



5499, C. M., type, 40 mm. to base of caudal; 5499, C. M., paratypes, six, 

 largest over 50 mm. Corumba, April 27, 1909. Haseman. 



Head 4.66-5; depth 3.33; D. 10, rarely 11; A. 29-34; lateral line 8 to 11 + 26 

 to 28 = 35 to 38; eight or nine scales between ventrals and dorsal; eye 3 in the 

 head, about equal to interorbital. 



Elongate, compressed, breast with a series of large median scales; belly 

 between pectorals and ventrals trenchant, the margins of the scales of one side 

 bent over the middle line, no median series of scales; predorsal with a median 

 series of about sixteen scales, the series less regular near the occipital process, 

 which extends about one -eighth of the way to the dorsal; skull smooth, convex, 

 frontal fontanel large, triangular, a little more than half the length of the parietal; 



