66 MR. C. TATE REGAN ON [May 12, 



about 2f times. Snovit, including processes, If times as long as 

 eye, the" diameter of which is 4 times in the length o£ head, 

 interorloital width 4| times. Interorbital space concave ; no 

 .spines on snout. Anterior processes longer than broad, flat, 

 rounded, with denticulated edges; from each a ridge running 

 backwards, ending in a rather broad, flat, somewhat obtuse 

 pra3opercular spine ; a short ridge below eye, without spine ; 

 a short feeble spine above posterior part of eye, a stronger 

 one behind it near posterior margin of head, below which 

 another, somewhat weaker; operculum with well-developed spine. 

 Margin of lower jaw with groups of short tentacles and a pair of 

 longer fringed tentacles which extend back scarcely beyond the 

 cleft of mouth. Gill- rakers moderate, about 16 on lower part of 

 anterior arch. 27 scutes in 4 longitudinal series, the 3 upper series 

 with strong recurved spines, the spines of the lower series quite 

 rudimentary. D YIII, 1 7, the spines slender, the third longest 

 and equal to f the length of head, thence decreasing ; soft rays 

 increasing in length to about the sixth, which is as long as the 

 longest spine, thence decreasing. A I 16, about f the height of 

 dorsal ; pectoral half as long as head ; ventrals extending to anal ; 

 caudal emarginate. Greyish (in spirit) ; pectorals dark. 



Description based on two examples from Rio Janeiro, the larger 

 190 mm. in total length. 



This species is veiy distinct from others so far described, and 

 it is difficult to say which should be considered its neai-est ally. 



Carangidje. 



The American species of the genus Scombroldes Lacep. {Chori- 

 nemus Cviv. & Yal.) belong to the section OligojMtes Gill, distin- 

 guished by having 4-5 dorsal spines, no pterygoid teeth, cheeks 

 with sclerous plates attached to the suborbitals, and linear scales. 

 There has been considerable difference of opinion as to the number 

 of species which ought to be recognised. 



Three examples of S. saliens Bloch from Rio Janeiro agree in 

 every particular with others in the British Museum Collection 

 fi'om the Pacific Coast of Mexico and Ecuador. This species is 

 readily distinguished by the anterior dorsal with 4 spines, the 

 deep body (depth 2|-3 times in total length), and the wide mouth 

 (the maxillary extending well beyond the eye). *S'. palometa Ouv. 

 & Val., hitherto regarded as a variety or subspecies of S. saliens, 

 is really quite distinct, the depth of the body being contained about 

 3 1 times in the total length and the maxillary only extending 

 to below the posterior margin of the eye, or a little beyond. This 

 species has hitherto been recorded only from the fresh or brackish 

 waters of Lake Maracaibo, Venezuela, but the British Museum 

 Collection contains a small example from Lake Yzabal, a lai'ge 

 inland lake communicating by the Rio Dulche with the Bay of 

 Honduras. S. cdttis GUnther and S\ sattriis Bl. Schn. each has 

 five spines in the antei'ior dorsal ; in the former the body is deep, 



