118 PROCEEDINGS OF THE ACADEMY OF [1888. 



ee. Anal rays II-9 ; second dorsal spine not nearly so 



long as head, and not half longer than second 



anal, rhombeus. 10. 



cc. Premaxillary groove broad, rounded behind, with a median 



linear depression, its surface scaled ; anal rays III-8 ; 



second dorsal spine about as long as head ; pectorals 



nearly as long as head, reaching front of anal ; teeth 



long, slender, and brush-like ; depth 2 in length. 



olisthostoma. 11. 



bb. Preorbital serrate ; body with distinct dark stripes along the 



rows of scales ; body rhomboidal, with angular outline; 



spines very strong. 



c. Yentrals blackish. fatao. 12. 



cc. Yentrals pale. 



d. Second dorsal spine f to | length of head, and f depth 



of body, which is 2 to 2| in its length. 



e. Pectoralslong,reachingabouttofrontof anal; caudal 



longer than head ; lateral stripes numerous ; 



depth nearly 2 in length. lineatus.^ 13. 



ee. Pectorals short, barely reaching vent ; caudal 



shorter than head ; lateral stripes few; depth 



about 2| in length. brevimanus. 14. 



dd. Second dorsal spine as long as head, and longer than 



longest anal spine ; pectorals narrow, reaching 



past tips of ventrals to anal ; lateral stripes about 



12; depth 2 to 2j in length. plumieri. 16. 



1. Gerres lefroyi (Goode) Glinther. 



Diapterus lefroyi, Goode, Am. Jour. Sci. & Aits, 123, 1874. 

 Eucinostomus lefroyi Goode, Bull. U. S. Nat. Mus., No. 5, 39, 1876. 

 Mucinostomus productus Poey, Ann. Lye, xi, 59, 1876. 

 Oerres lefroyi Giinther, Voyage of Challenger, Fishes, i, 10, 1880. 

 (Name only.) 

 Habitat. — Bermuda Islands. 



2. Gerres gracilis (Gill) Jordan & Gilbert. 



Diaptertis gracilis Gill, Proc. Ac. Nat. Sci. Pliila., 246, 1863. (Cape 



San Lucas.) 

 Oerres aprion Giinther, iv, 255, 1862. (San Domingo; Jamaica; Bahia.) 



' The short description of Oerres brasilianus C. and V., vi, 458, contains no 

 characteristics by which we are able to distinguish it from either O. lineatus 

 or O. brevimamis, hence we do not include it in the Key. 



