IV. NEW GENERA AND SPECIES OF SOUTH AMERICAN 



FISHES 



X. BLEPTONEMA Eigenmann. 

 General Appearance of Gephyrocliarax : 



Teeth tricuspid, in a single series on mandible, premaxillary and along 

 entire edge of maxillary ; adipose tin well developed ; first and second 

 developed anal rays filigerons, curved ; pectorals placed low, long and 

 falcate, their margiiis nearly along the edge of the compressed belly when 

 the tin is closed; lateral line incomplete; mouth very oblique; profile 

 from tip of snout to v^^iear dorsal straight ; origin of dorsal behind the 

 middle. 



17. B'eptonema paraguayensis Eigenmann si. nov. 

 541)9a O. M. Type, 40 mm, to base of caudal ; 5499 C. M. [mi-atypes, six, 



the largest over 50 nnn. Gorumba. April 27, 1009. Haseman. 



Head 4.66-5; depth 3.33 ; D. 10, rarely 11; A. 31-34; lateral line 8 to 

 11+26 to 28=36 to 38, 8 between ventrals and dorsal; eye 3 in the head, 

 about e(iual to interorbital. ^ 



Elongate, compi'essed. Breast with a series of large median scales ; 

 )>elly between pectorals and ventrals treuchant, the margins of the scales 

 of one side bent over the middle line; no inedian series of scales; predorsal 

 with a median series of about 16 scales, the series less regular near the 

 occipital process hich extends about one-eighth to the dorsal ; skull smooth 

 convex; frontal foJitanel large, triangular, a little more than half the length 

 of the parietal ; second suborliital in contact with both the posterior and 

 lower limb of the preopercle ; mouth very oblique, maxillary -premaxillary 

 border n little more than orbital length; about 20 teeth on the maxillary, 

 those on the posterior half larger, pointing backward and outward; seven 

 ]>remaxillary teeth ; mandible with six or seven tricuspid teeth, the first 

 and last distinctly larger than the middle ones, abruptly several minute 

 teeth on the sides. 



Origin of dorsal nearer base of middle caudal rays than to the eye ; 

 origin of anal in front of the dorsal ; first developed anal ray heavy and 

 much jn'olonged, the second less so, outer ventral ray filiform, extending 

 beyontl the origin of the anal, pectorals to near the middle of the ventrals ; 

 pectorals placed, low. their base oblique, their shortest ray about .2 of the 

 outer ray, which is similar to the outer ventral and first developed anal ray. 



Scales everywhere regularly imbricate, with few radials, a series of 

 very small scales along the base of the anal, caudal naked ; axillary scales 

 small. 



No color markings ; margin of anal in the male dusky. 



18. Bleptonema amazonae Eigenmann sp. nov. 

 5497a C. M. type, 54 nnu.. 5498 a-c C. M. paraty]ies, three, 50-55 nnn. San 

 tarem. Dec. 9, 1!;0.>. Haseman. 

 This species is very similar to paiaijiKiiicnsis. 



The scales are 8 to 14+26 to 30=38 to 41, 9 or 10 between ventrals and 



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