390 Mr. C. T. Regan— A Revision of 



Depth of body 4^ to 5^ in the length, length of head 4 to 

 4j. Caudal peduncle f to | length of head. Snout shorter 

 than the diameter of eye, which is 2f to 3^ in tlie length of 

 head ; interorbital width 2^ to 2|. 26 or 27 scales in a 

 longitudinal series. Dorsal 10 ; origin equidistant from 

 middle or posterior part of operculum and base of caudal. 

 Anal 11-12. Olivaceous; a blackish stripe round lower jaw- 

 to eye, continued as a more or less distinct brownish stripe 

 from eye to operculum ; a large black spot on dorsal fin. 



Guiana. 



1-2. 65-80 mm. Essequibo. Ehrhardt. 



3. 50 mm. Issorora, Brit. Guiana. Eigenmanu. 



4-5. 35-40 mm. Lama, „ „ „ 



2. Pt/rrhulina nattereri. 



? Holotaxis melanostomus, Cope, Proc. Amer. Phil. Soc. xi. 1871, 



p. 563. 

 Pyrrhulina nattereri, Steiad. Sitzungsb. Akad. Wien, Ixxii. 1876, 



p. 13, pi. ii. tig. 5. 



Depth of body 5 in the length, length of head 4 J. Caudal 

 peduncle nearly as long as head. Snout somewliat shorter 

 than diameter of eye, which is 3^ in the length of head ; 

 interorbital width 2^. 22 scales in a longitudinal series. 

 Dorsal 9-10, elevated in the male, nearly reaching caudal 

 when laid back ; origin equidistant from middle of operculum 

 and base of caudal. Anal 10-11. Olivaceous; scales of 

 back and sides dark-edged ; a small pale blue spot with dark 

 margin at the posterior end of each scale on the side ; a dark 

 stripe from upper part of eye round end of snout, another 

 from eye round lower jaw, continued on body as a faint 

 dusky band ; a large blackish spot on middle of dorsal fin, 

 with red band below it. 



Amazon. 



1. 40 mm. Amazon. Arnold. 



This specimen is undoubtedly P. nattereri ; it agrees with 

 the description of H. melanostomus in every way, except that 

 the latter is said to have 25 scales, a number perhaps 

 obtained by counting forward above the opercle or by 

 including the scales on the caudal fin. 



3. Pyrrhulina semifasciata. 



■? Holotaxis lata, Cope, Proc. Acad. Pliilad. 1871, p. 257. 



Pyrrhulina semifasciata, Steind. Sitzungsb. Akad, Wien, Ixxii. 1876, 



p 7, pi. i. figs. 1, 2; Eigenm. it Eigenm. Proc. Calif. Acad. (2) ii. 



1890, p. 110. 



