338 Mr. C. T. Regan on the Fishes of the 



blackish blotch below the lateral line ; sometimes a dark 

 vertical stripe below the eye ; 2 or 3 blue lines from eye to 

 maxillary; sides of head and anterior part of body with blue 

 spots ; vertical fins dusky, obscurely spotted. 

 Western Ecuador. 



1-4. (52-96 mm.) trpes of the species. W. Ecuador. 



5-6. (55 and 76 mm. J Rio Viuces. Dr. H. Festa. 



Although similar to A. rivulata in colour, this species is 

 markedly different in other characters. 



8. Acara rivulata. 



Chromis rivulata (part.), Giiath. Proc. Zool. See. 1859, p. 418. 

 Acara pulchra (part.), Glinth. Cat. Fish. iv. p. 280 (1862). 

 Acara rivulnta (part.), liouleng. Boll. Mus. Torin. xiv. 1899, no. 335, 

 p. 5 ; Pellegr. Mom. Soc. Zool. France, xvi. 1903, p. 177 (1904). 



Depth of body 2^-2| in the length, length of head 3. 

 Snout as long as postorbital part of head. Diameter of eye 

 3f— A in the length of head, iuterorbital width 3-3^. Depth 

 of prseorbital 1-1^ the diameter of eye. Maxillary not ex- 

 tending to the vertical from anterior margin of eye ; jaws 

 equal anteriorly ; fold of the lower lip not continuous ; cheek 

 with 3 or 4 series of scales ; pneoperculum scaleless ; 7 or 8 

 gill-rakers on the lower part of anterior arch. Scales 

 27-28 |f^, \\ between lateral line and anterior rays of soft 

 dorsal. Dorsal XIV-XV 10-12, commencing above the 

 opercular cleft, the spines increasing in length to the last, 

 •which is a little more than | the length of head ; fourth 

 spine \ the length of head or a little less ; soft fin pointed, 

 the longest rays extending nearly to middle of caudal, some- 

 times beyond. Anal III 8-9. Dorsal and anal fins scale- 

 less. Pectoral nearly as long as the head; ventral extending 

 nearly to origin of anal ; caudal rounded ; caudal peduncle 

 as long or nearly as long as deep. Brownish above, yellowish 

 below ; 4 or 5 cross-bands on the side which are much 

 broader than the interspaces between them, the first crossing 

 the first 7 or 8 scales of the lateral line, the second the 9th 

 or 10th and 3 succeeding scales of the lateral line, bearing a 

 large blackish blotch below the lateral line ; a blackish 

 vertical stripe below the eye; 3 blue lines from eye to max- 

 illary ; sides of head with blue spots; vertical fins dusky, 

 obscurely spotted. 



Western Ecuador. 



1. (1,36 mm.) type of the species. W.Ecuador. 

 2-4. (113-126 ram.) Rio Peripa. Dr. H. Festa. 



