eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 447 



289. Odontognathus mucronatus Lacepede. 



Odontognathus mucronatus Lacepede, Hist. Nat. Poiss., II, 1799, 221, pi. 7, fig. 2 



(Cayenne).— Jordan and Evermann, Bull. U. S. Nat. Mus. No. 47, 1896, 438. 

 Gnathobolus mucronatus Cuvier and Valenciennes, Hist. Nat. Poiss., XXI, 1848, 



91. 

 Pristigaster mucronatus Gunther, Catalogue, VII, 1868, 462. 



Several specimens of this species were taken by Dr. Ellis in a trench in George- 

 town. 



Head 5.5; depth 4.5; D. 11; A. 71-79; scales 8+12; eye longer than snout, 

 3.5 in the head. 



In general appearance like Hydrolicus. Very greatly compressed, the thorax 

 somewhat expanded; the pectorals large, longer than the head. Maxillary mu- 

 cronate. Dorsal entirely in the last third of the length. 



Family XIV. ENGRAULID.E. 



Anchovies. 

 Stolephorus Lacepede. 

 Stolephorus Lacepede, Hist. Nat. Poiss., V, 1803, 381. 

 Type, Atherina japonica Linnaeus. 



Teeth small, no canines; origin of dorsal in advance of that of the anal; gill- 

 membranes nearly separate, free from the isthmus; no pectoral filaments. 



Key to the Guiana Species of Stolephorus. 



a. Anal about 15; preopercular margin not especially oblique; maxillary short, not reaching the angle of the 

 preopercle; gill-rakers not equal to the pupil; pectorals not reaching the ventrals; origin of the dorsal 

 a little nearer to the snout than to the caudal; origin of anal and base of last dorsal ray equidistant 

 from the snout. Subfusiform, but little compressed; depth 5.3 in the length; maxillary extending 

 beyond the eye. A lateral band; scales below it free from pigment or with black chromatophores; 

 scales above it faintly outlined in black; mid-dorsal area with a double row of chromatophores; outer 



rays and caudal margin black guianensis. 



aa. Anal about 25; D. 13; snout produced, pointed. Preopercular and opercular margin very oblique, maxillary 

 reaching the angle of the preopercle; back narrowly spotted; base of anal with a series of dots; sides 



with faint dots surinamensis. 



aaa. Anal about 37; maxillary reaching the gill-opening; subopercle with a flat triangular process., .spinifer. 



290. Stolephorus guianensis sp. nov. (Plate LXII, fig. 5.) 



Type, 38 mm. Bartica rocks. (Carnegie Museum Catalog of Fishes No. 

 2448a.) 



Cotype, 40 mm. Morawhanna. (I. U. Cat. No. 12562.) 



