236 PROCEEDINGS OF THE ACADEMY OF [Apr., 



■catenatum Eigenmann.^ From the latter it differ,s chieflj^ in the 

 dark horizontal cross-bands on the dorsal fin, that species being 

 iigured and described as having a uniform dorsal. 



{Fascia, streak; dorsalis, of the back; with reference to the streaked 

 •dorsal fin.) 



ANOSTOMIN^. 



Leporellus vittatus (Valenciennes). 



Two examples, one 195 mm. and the other 126 mm. Compared 

 with the example from the Peruvian Amazon,^ I find they differ 

 •only according to age. I cannot find that the species has been 

 recorded from Guiana previously. The following notes may be of 

 value: Head 3|; depth 4|; D. iii, 9, i or iii, 10, i; A. in, 8, i; 

 scales 37 to 39 in 1. 1. to caudal base and 4 or 5 more on latter; 6 

 scales above 1. 1.; 5 scales below 1. 1. to anal origin; 11 predorsal 

 scales; snout 2| in head; eye 5 to 6; maxillary 3 to 3|. In color 

 these examples show a dark or dusky spot on each scale of sides and 

 back. Dark spots on head large and irregular on front and snout, 

 small and less numerous on cheek and opercle. Dorsal with large 

 broad distal blackish blotch, and another blackish streak transversely 

 subbasally. Broad dark lateral band includes 1. 1. and extends out 

 on median caudal rays to their tips. Each caudal lobe with two 

 blackish transverse horizontal bars. Adipose fin pale, lower edge 

 blackish. Other fins pale, ventrals and anal with median dusky 

 shade. 



Anostomus anostomus (Linnseus). 



Three examples, 81 to 85 mm. (caudals damaged). 



Leporinus nigrotaeniatus (Schomburgk). 



Five examples, 142 to 190 mm. 

 Leporinus friderici (Bloch). 



One example 210 mm. in length, and a smaller one 120 mm. long.^" 

 Leporinus alternus EiRenmann. 



Two examples, 70 to 73 mm. in length. The only point at variance 

 in the original account is the statement ''four graduated, oliliquely- 

 pointed teeth in each jaw," my examples, however, showing eight 

 teeth in each jaw. 



8 Mem. Carnegie Mus., V, 1912, p. 293, Pis. 38, figs. 5-6. Warraputa, Rock- 

 stone and Crab Falls. 



9 Froc. Acad. Nat. Sci. Phila., 1900, p. 327. 



'"The Parahyba example which I identified with Sahnn faKriatiis Bloch, in 

 Proc. Acad. Nat. Sci. Phila., 1906, p. 328, I feel certain is identical with Lepo- 

 ■rinus conirostris Steinda(!hner, Silz. Ak. Wiss. Wien, LXXI, I, 1875, p. 233, PI. 4. 



