448 DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 
150. GERRES AXILLARIS. 
Giinth. Proc. Zool. Soc. 1864, p. 102. 
D. 910. A. 3/8. L. lat. 34. L. transv. 5/10. 
Allied to G. plumieri, but with considerably shorter fin-spines. The height of the 
body is contained twice and a fourth in the total length (without caudal). Preorbital 
finely serrated. Snout as long as the eye; the groove for the intermaxillary processes 
is very broad, scaleless, extending backwards to the vertical from the centre of the eye. 
Dorsal fin notched, the last spine being not much longer than the eye; dorsal spines 
strong, the second as Jong as the head without snout; the second anal spine stronger, 
but scarcely longer than the second of the dorsal fin. The pectoral extends to the 
vertical from the third anal spine. Caudal deeply forked, with the lobes equal in 
length to each other and to the pectoral. A blackish streak along each series of scales ; 
the hinder side of the axil, and sometimes the anterior, blackish. 
Three specimens, from 8 to 9 inches long, were collected by Mr. Salvin at Chiapam, 
151. GERRES BREVIMANUS. 
Giinth. Proc. Zool. Soc. 1864, p. 152. 
D. 9/10. A. 3/8. L. lat. 39. L. transv. 6/11. 
Prieorbital minutely serrated. The height of the body is contained twice and two- 
fifths in the total length (without caudal), the length of the head twice and a half. 
Snout as long as the eye; the groove for the intermaxillary processes is broad, scaleless, 
not extending backwards to the vertical from the centre of the eye. Dorsal fin notched, 
the last spine being longer than the eye; dorsal spines strong, the length of the second 
equals the distance between the end of the operculum and the anterior nostril; the 
second anal spine stronger, but much shorter, than the second of the dorsal fin. The 
scaly sheath of the anal fin leaves the outer half of the last ray uncovered. ‘The 
pectoral extends scarcely to the vertical from the vent. Caudal scaly, deeply forked, 
with the lobes equal in length, each being one-fourth of the total. Three or four 
blackish streaks along the series of scales below the lateral line; the spinous dorsal 
fin black. 
One specimen, 10 inches long, was found by Mr. Salvin at Chiapam. 
155. GERRES DOVII. 
Diapterus dowii, Gill, Proc. Ac. Nat. Se. Philad. 1863, p. 162. 
This species is characterized thus :— 
9 
Diigee 2 L. lat. 47. LL. transv. 5/10. 
The greatest height is contained thrice and a half in the extreme length; the head 
four times and a quarter; the diameter of the eye twice and three-fourths in the head ; 
the snout equals four-fifths of the eye. The profile is rectilinear, and the interorbital 
