1906.] FRESH-WATER FISHES OF TRINIDAD. 391 



The male is a very elegant little fish and vaiies considerably in 

 colour and marking. 



"Colour: Male olivaceous, silvery below ; a dark longitudinal 

 stripe from eye to middle of side, another on the posterior part of 

 the body ; usually two to four blackish spots, including one at 

 each end of the posterior stripe ; these may be accompanied by 

 reddish spots. Female olivaceous, silvery below, without spots^oi' 

 stripes." 



27. DOBYICHTHYS LINEATUS Kaup. 



Hah. Atlantic Coasts and Rivers of Tropical America, the 

 African D, aculeatus being apparently distinct. 



28. Agonostomus monticola Bancroft. 



Hah. Fresh-waters of the West Indies (Jamaica, Bai-bados,. 

 St. Vincent, Dominica, Trinidad) and of Mexico. 



29. MuGiL brasiliensis Ag. 

 Hob. Cuba to Patagonia. 



30. MuGiL TRiCHODON Poey. 

 Hah. Florida to Brazil. 



31. Ceivitropomus undecimalis B1., and 



32. Centropomus ensiferus Poey. 



" These fishes, known as ' Broche,' ' Robalo,' or ' Snook,' were- 

 caught in the Oaroni River, where they have been taken over- 

 20 pounds in weight. They are marine, but go a long way up- 

 fresh-water streams in search of food. According to Mr. Pasea, 

 they can be bred in artificial ponds or in large fresh-water pools 

 that have no connection with the sea." 



Hah. Atlantic Coasts and Rivei-s of Tropical America. 



33. Polycentrus schobieurgkii Miill. & Trosch. (Plate XXY. 

 fig. 2.) 



" The ' King or Black Cascarob ' is a A'^ery peculiar little fish, 

 which, when alarmed, changes almost instantly from black to- 

 whitish or pinkish white, rapidly vibrates the pectoral fins, and, 

 instead of running away, turns on one side and remains for a long- 

 time in a crouching position. They are uncommon, and were 

 caught by means of a circular hand-net in the thick rank grass, 

 which grows at the sides of the ravines." 



Hah. Trinidad ; Venezuela ; Guiana. 



34. Crenicichla saxatilis L. 



" Name ' Mulct ' (pronounced Mil-lay). Head olive or greyish' 

 green ; eye with a dark crimson splash ; back dull olive and 

 yellowish green, belly greyish or bluish grey ; pale green metallic- 

 spots on the sides often present, or if they be absent, blackish 

 cross-bars ; sometimes a blackish longitudiral stripe; fins varying. 



