DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 427 



1 thought it possible for sonic time that this fish might be identical with Umhrino 

 iindulata of Girard ; however, as this writer states that the anal spines of U. undulata 

 are feeble, and gives 1/9 for the number of anat rays, we are not justified in identifying 

 these two species. 



61. CORVLXA f;HRYSOLKUC.\. (PI. LXVII. fig. 1.) 



Allied to C. ronchus. 



1). 10:^3. A. ^^. L. lat. 55-50. L. transv. ■^. 



The height of the body is contained thrice in the total length (without caudal), the 

 length of the head thrice and one-third. Head thick ; snout obtuse, with the upper 

 jaw sliglitly overlapping the lower, as long as the diameter of the eye, which is con- 

 tained four times and two-thirds in the length of the head. The maxillary is nearly 

 entirely hidden by the prseorbital, and extends beyond the vertical from the centre of 

 the orbit. Teeth of the outer sei-ies of the upper jaw rather stronger than the others. 

 Interorbital space slightly convex, only one-third wider than the orbit, its width being 

 two-sevenths of the length of the head. Pi-aeoperculum with spinous teeth round its 

 margin, three on and below the angle being much stronger than the others. Supra- 

 scapular denticulated. The second dorsal spine is the strongest, and the third the 

 longest, being as long as the postorbital portion of the head. The second anal spine is 

 very strong, as long as the longest of the spinous dorsal, and not much shorter than the 

 first anal ray. Caudal fin irregularly rounded. Silvery, irregularly mottled with large 

 brownish patches shining golden. A young specimen (5 inches long) is more uniform 

 silvery. 



Two specimens, 9 inches long, were collected by Capt. Dow at Panama. 



I have observed in this species a most extraordinary variation in the size of the scales 

 above the lateral line, such as I do not recollect having seen in other Acanthopterygian 

 fishes. The two larger specimens are of nearly the same size ; yet the dorsal scales of 

 one arc only lialf the size of those of the other. The lateral line is composed of nearly 

 the same number of scales in both, and also the scales below the lateral are of nearly 

 the same size. 



62. CORVI.NA VKRMICULARIS. (PI. LXVII. fig. 2.) 



D. 10 1 1. A. l L. transv. ^. 



The height of the body is a little more than one-third of the total length (without 

 caudal) ; the length of the head two-sevenths. Head moderately compressed, snout 

 obtuse, with the upper jaw overlapping the lower, a little longer than the diameter of 

 the eye, which is one-fifth of the length of the head. The maxillary is entirely hidden 

 by the pneorbital, and extends somewhat beyond the vertical from the centre of the 

 orbit. Teeth of the outer series of the upper jaw rather stronger than the others. 

 Interorbital space convex, only one-fourth wider than the orbit, its width being one- 



3 X 2 



