258 PROCEEDINGS OP THE ACADEMY OP [1886. 



j. Body ovate, the outline somewhat regularly elliptical, 

 depth 2^ in length. Dorsal spines slender, but little 

 flexible, the second scarcely stronger than the third, 2 in 

 length of head. Second and third anal spines subequal, 

 2 1 in length of head ; second stronger than third. 



Aureolus. 8. 



jj. Body rhomboidal, short and deep, with angular outlines, 



the depth usually more than half the length ; spines long 



and slender. 



k. Anal rays III, 8 ; second dorsal spine | or more length ol 



head ; second anal spine more than half length of head 



Peruvianus. 9. 

 kh. Anal rays II, 9 ; second dorsal spine about length of 

 head ; second anal spine If in length of head. 



Bhombeus. 10. 

 ii. Premaxillary groove broad, oval, and covered with scales 

 (these sometimes deciduous in poorly preserved speci- 

 mens). Anal rays III, 8 ; second dorsal spine 1;^ in head ; 

 second anal spine If in head ; teeth rather long and 

 slender. OUsthostoma. 11. 



hh. Preorbital serrate, a distinct dark streak along each row of 

 scales on back and sides ; body rhomboidal, with angular 

 outlines; spines very strong; anal ra3'S III, 8 or 9. 

 (Gerres). 



I. Yentrals blackish ; upper margin of dorsal fin falcate ; 



depth 2^ in length ; scales 5-38-9. Brasilianus. 12. 



II. Yentrals pale. 



m. Spines moderate, the second dorsal spine f to | length 

 of head. 

 n. Pectorals long, reaching to front of anal ; caudal 

 longer than head ; lateral stripes numerous ; depth 

 nearly 2 in length. Lineatus. 13. 



nn. Pectorals short, barely reaching vent ; caudal shorter 

 than head ; lateral stripes few ; depth about 2| in 

 lenoth. Brevimanus. 14. 



mm. Spines very high, the second dorsal spine longer than 

 head ; second anal spine about equal to length of 

 head ; lateral stripes very distinct, about 12 in num- 

 ber; depth of body 2^ in length. Flumieri. 15. 



