[71] 



REVIEW OF THE SCI.ENlDiE. 413 



longest dorsal spine 1^. Color uniform dusky, paler below; dorsals punctate 

 with black. Head 3£ ; depth 4. D. X-I, 25 to 27 ; A. II, 6. Scales 58. 



Furcr.eus, 76. 

 bb. [Maxillary reaching line of front of eye, its length 3| in head ; .barbels 3, well 

 developed ; body oblong, compressed ; eye not very large, 3| to 3f in head ; 

 snout prominent, rounded, 3f in head; preorbital broad; teeth equal; pre- 

 opercle rather finely serrate ; soft dorsal closely scaled ; anal scaly at base 

 only ; pectoral, If in head ; caudal rhombic, 1£ in head ; second anal spine, 2 } 6 ; 

 third dorsal spine, 1$. Color silvery, with 5 dusky longitudinal bauds ; dorsals 

 edged with black, the membranes of the spinous part with longitudinal series 

 of dark dots. Head 3£ ; depth 3|. D. X-I, 26; A. II, 6. Scales 50 to 55.] 



(Steindachner. ) Trifilis, 77. 



aa. Dorsal rays X-I, 31 or 32; back and dorsal fins sprinkled with round dark 

 spots ; caudal fin not rhombic ; outer teeth above slightly enlarged. Body 

 rather elongate, the back elevated ; head rather slender, depressed above the 

 eye ; snout rather long, bluntish at tip, 3 in head ; eye large, 5 in head ; 

 mouth small, low, inferior, scarcely overtipped by the snout, the maxillary 

 reaching front of eye, 3£ in head ; teeth in broad bands, the outer teeth of 

 upper jaw somewhat enlarged ; barbels at chiu 3, minute, not longer than nos- 

 tril ; preopercle sharply serrate. Gill-rakers slender, very short ; preopercle 

 and especially preorbital much swollen, cavernous, and translucent; mandi- 

 ble not cavernous ; dorsal spines strong, the longest 2 in head, as long. as the 

 large anal spine ; pectoral If in head ; caudal fin /-shaped, the upper lobe 

 pointed. Color brown, with round dark-brown spots scattered over the back 

 and sides, these forming streaks along the rows of scales, which are more or 

 less irregular or interrupted, the spots not being confluent ; both dorsals with 

 rows of similar spots ; ventrals dusky. Head 3| in length ; depth 3*. D. 

 X-I, 31 or 32 ; A. II, 6 to 8. Scales 75 (8-67-13) Adspersus, 78. 



76. PACHYPOPS FTJRCRiEUS. 



Perca furcrcea Lacepede, Hist. Nat. Poiss., iv, 398, 424, 1802 (? Surinam). 

 Corvina furcrcea Cuv. & Val., Hist. Nat. Poiss., v, 111, 1830 (same type). 

 Pachypops furcrceus Steindachner, Beitr. zur KenntnissSciamoiden Brasiliens, 7, plate 1, 



1863 (Rio Negro). 

 Pachyurus furcrceus Steindachner, Ichthyol. Beitr., viii, 12, 1879 (Surinam ; Rio Trom- 



betas ; Rio Negro ; Amazon, near Cameta). 

 Corvina biloba Cuv. & Val., Hist. Nat. Poiss., v, 112, 1830 (habitat not known). 

 Pachypops biloba Steindachner, Ichth. Notiz., 206, 1864 (Surinam). 



Habitat. — Rivers of Brazil ami Guiana. 



Specimens of this species are in the museum at Cambridge from Rio 

 Trombetas, Rio Negro, Obidos, and Cameta. The specimen here, de- 

 scribed was obtained in Rio Negro by Rev. J. C. Fletcher. 



This species was named in honor of a French chemist, Fourcroi. 



77. PACHYPOPS TRIFILIS. 



Micropoyon trifilis Miiller and Troschel, Schomburg Reise, iii, 622, 1848 (Guiana). 



Gunther, Cat. Fish. Brit. Mus.. ii, 273, 1860 (copied). 

 Pachypops trifilis Gill, Proc. Acad. Nat. Sci. Phila., 1861, 87 (copied). Steindachner, 



Beitr. zur Kenntniss Sc'ueuoiden Brasiliens, 7, plate ii, figs. 1-3, 1863 (Rio Gua- 



pore ; Rio Negro). 

 Pachyurus trifilis Steindachner, Ichthyol. Beitr., viii, 12, 1879 (synonymy). 



Habitat. — Rivers of Brazil and Surinam. 



This species is known to us from Pr. Steindachner's descriptions and 

 figure only. 



