DR. GlJNTHBR ON THE FISHES OF CENTRAL AMERICA. 443 



118. Atherinichthts pachylepis. 

 Gunth. Proc. Zool. Soc. 1864, p. 25. 



D. 4|(5^. A. ooi2l- L. lat. 41. L. transv. 7. 



The height of the body is nearly equal to the length of the head, and contained five 

 times and a half or five times and a third in the total length (without caudal). The 

 snout is short, not longer than the diameter of the eye ; and the cleft of the mouth does 

 not extend backwards to below the anterior margin of the eye. The anterior dorsal is 

 composed of short, feeble spines ; and its origin is opposite to the fourth or fifth anal 

 ray. The pectoral fin is much longer than the head. The silvery streak occupies the 

 adjoining halves of the third and foui-th series of scales. 



Two specimens, 6 inches long, were collected by Capt. Dow at Panama. 



119. Atherinichthts guatemalensis. 

 Giinth. Proc. Zool. Soc. 1864, p. 151. 



D. 4|g. A. ^. L. lat. 36. L. transv. 7. 

 Anterior dorsal fin very small, inserted behind the vertical from the commencement 

 of the anal fin. The height of the body is contained five times in the total length (with- 

 out caudal), the length of the head four times and a fourth. The silvery band occupies 

 the third upper series of scales. The lower caudal lobe rather longer than the upper. 



Several examples, from 2 to 2^ inches long, were collected by Mr. Salvin in the Lakes 

 of Huamuchal. 



120. MUGIL BRASILIENSIS (AgaSS.). 



Messrs. Dow, Godman, and Salvin have collected numerous examples of all sizes at 

 Belize, Chiapam, and Panama. I have no doubt that M. guntJieri, Gill, Proc. Ac. Nat. 

 Sc. Philad. 1863, p. 169, is founded on a specimen of this species; it is described as 

 having all the fins scaleless ; but, as all our specimens of M. brasiliensis and M. incilis 

 have the dorsal and anal more or less covered with minute scales, I suppose that these 

 scales have either been lost in the example of the Smithsonian Institution, or overlooked. 



The fii'st dorsal spine, in this species, is either longer than or as long as the second. 

 L. lat. 36-38. 



121. MUGIL INCILIS. 

 Mugil incilis, Hancock in Lond. Quart. Journ. Sc. 1830, p. 127. 



D. 4|g. A. g. L. lat. 42-44. L. transv. 15. 

 Closely allied to M. brasiliensis, but with smaller scales, and with the second dorsal 

 spine rather longer than the first. 



The height of the body equals the length of the head, which is two-ninths of the 

 total (without caudal). The snout is moderately broad, scarcely convex, with the lower 

 profile ascending in the same degree as the upper descends ; the interorbital space is 

 slightly convex, its width being contained twice and two-thirds in the length of the 

 head. Upper lip rather thin. The angle made by the two mandibulary bones is a 



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