DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 443 
118. ATHERINICHTHYS PACHYLEPIS. 
Giinth. Proc. Zool. Soc. 1864, p. 25. 
D. 4\¢5- A- spay 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 fourth series of scales. 
Two specimens, 6 inches long, were collected by Capt. Dow at Panama. 
119. ATHERINICHTHYS GUATEMALENSIS. 
Giinth. Proc. Zool. Soc. 1864, p. 151. 
D.4|5. A.s. 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 24 inches long, were collected by Mr. Salvin in the Lakes 
of Huamuchal. 
120. MveiL BRASILIENSIS (Agass.). 
Messrs. Dow, Godman, and Salvin have collected numerous examples of all sizes at 
Belize, Chiapam, and Panama. I have no doubt that J/. giintheri, 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 MW. brasiliensis and M. ineilis 
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 first dorsal spine, in this species, is either longer than or as long as the second. 
L. lat. 36—38. 
121. Mueiu INcILIs. 
Mugil incilis, Hancock in Lond. Quart. Journ. Se. 1830, p. 127. 
D.4|; A.2. LL, lat. 42-44. 1. tansy, 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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