[71] REVIEW OF THE SCILENIDA, 413 
longest dorsal spine 1}. Color uniform dusky, paler below; dorsals punctate 
with black. Head 34; depth 4. D. X-I, 25 to 27; A. II, 6. Scales 58. 
FURCREUS, 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, 34 to 3% in head; 
snout prominent, rounded, 34 in head; preorbital broad; teeth equal; pre- 
opercle rather finely serrate; soft dorsal closely scaled; anal scaly at base 
only; pectoral, 1¢ in head ; caudal rhombic, 14 in head ; second anal spine, 24 ; 
third dorsal spine, 12. ioler silvery, with 5 dusky foeictt iain bands ; dorsals 
edged with black, the membranes of the spinous part with longitudinal series 
of dark dots. Head 34; depth 34. D. X-I, 26; A. II, 6. Scales 50 to 55. ] 
MRURRIRELENNEN son aren ee le wt. Sarees cao cl kleine ted cea eein soe Ne TRIFILIS, 77. 
ae 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, Sesh 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, 34 in head; teeth in broad bands, the outer teeth of 
upper jaw somewhat enlarged ; barbels at chin 3, minute, not longer than nos- 
tril; preopercle sharply serrate. Guill-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 1? in head; caudal fin f-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 33. D. 
X=I, 31 or 32; A. 11,6 to8. Scales 75 (8-67-13):...........:- ADSPERSUS, 73. 
76. PACH YPOPS FURCRAWUS. 
Perca furcrea Lacépéde, Hist. Nat. Poiss., iv, 398, 424, 1802 (? Surinam). 
Corvina furcrea Cuv. & Val., Hist. Nat. Poiss., v, 111, 1830 (same type). 
Pachypops furcreus Steindachner, Beitr. zur Kenntniss Scienoiden Brasiliens, 7, plate 1, 
1863 (Rio Negro). 
Pachyurus furcreus 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 and 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. PACH YPOPS TRIFILIS. 
Micropogon trifilis Miller and Troschel, Schomburg Reise, iii, 622, 1848 (Guiana). 
Giinther, Cat. Fish? Brit. Mus., ii, 273, 1860 (copied). 
Pachypops trifilis Gill,. Proc. Acad. Nat. Sci. Phila., 1861, 87 (copied). Steindachner, 
Beitr. zur Kenntniss Scienoiden Brasiliens, 7, plate ii, figs. 1-3, 1863 (Rio Gua- 
poré ; Rio Negro). 
Pechyurus trifilis Steindachner, Ichthyol. Beitr., viii, 12, 1879 (synonymy). 
Habitat.—Rivers of Brazil and Surinam. 
This species is known to us from Dr. Steindachner’s descriptions and 
figure only. 
