766 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



not so nearU' rounded; the width of each patch is half its length. The 

 vomerine patches are not separated, though notched at the median line 

 before and behind. 



jVIaxillarj' barbel reaching just past base of pectoral spine, not quite 

 to pectoral pore; postmental barbels to edge of branchiostegal mem- 

 brane; mental bai'bels two-thirds of the distance from their base to 

 edge of branchiostegal membrane. Pectoral pore xery small. Humeral 

 spine more slender than in G. Jordan!^ and more concaA^e on upper 

 edge, making its point more acute. Gill rakers, 5+10. 



Color very dark brown, nearly black on upper parts; lower parts 

 silvery white. The dark color of back gradually changing to the white 

 of lower parts on bod3% but on anterior part of head the dark color 

 extends down to a little below eye and changes abruptly to white; the 

 change is more gradual on opercular region. A large black spot just 

 behind gill opening covers humeral spine. Base of dorsal spine dark, 

 the rest of the tin pale, adipose dorsal dusk}" only at base. A jet black 

 blotch covers nearl}" the entire anal tin, beginning sharply at the base 

 of the fin in strong contrast with the pure white of bod}^ just above, 

 leaving a narrow light border along the anterior edge of fin, and a 

 broader one across tips of Y^Lya. A similar spot on ventrals, but dif- 

 fused upward into the silvery wiiite of belly, extending farther toward 

 tips of rays on upper surface of fin than on lower. Upper surface of 

 pectoral dark at base of ra3\s, becoming lighter toward ends of rays, 

 not nearl}' so dark as on other lower fins except on a small region at 

 base. Lower surface of pectoral slightl}" dusky. Caudal without 

 color. Maxillar}'^ barbel black. 



The type and sole specimen was collected at Callao, Peru. It is 255 

 nmi. in entire length, and is deposited in the .U. 8. National Museum, 

 Cat. No. 53466. 



This species is named for Mr. P. O. Simons, Avhose life was lost 

 while making this and other collections in South America. 



g. LEPTARIUS DOWI Gill. 



A single specimen from Guayaquil does not difi'er from Panama 

 specimens. 



lo. NETUMA KESSLERI ( Steindachner). 



A single specimen collected at Guayaquil. It has been compared 

 with specimens from Panama and found to ditier in no particular. 



II. TACHYSURUS EQUATORIALIS, new species. 



Head, S^V i" length to base of caudal; depth, 6f. Eye, 5 in head; 

 snout, 3; width between angles of mouth, 3; width of head, 1^, length 

 of dorsal spine, 1^; first dorsal ray, li; first pectoral ray, If; ventral 

 fin, If; longest anal ra}^ 2; base of adipose dorsal, 3; depth of caudal 

 peduncle, 3. Dorsal, I, 6; anal, 23. 



