132 Frerp Museum or Naturart History— Zo6iocy, Vor. X. 
This species inhabits fresh-water streams of the Pacific Slope from 
Sinaloa, Mexico, to Ecuador. 
Turrubales (1), 115 mm.; Orotina (28), 73 to 220 mm.; Jesus Maria 
(7), 115 to 120 mm.; Rio Machuca (1), 200 mm. (Alfaro). 
Sicydium pittieri Regan. 
Sicydium pittieri Regan, Ann. & Mag. Nat. Hist., 1907, 260 (Rio 
Grande de Térraba, Costa Rica) ;— Regan, Biol. Cent. Amer., 
1908, 185. 
Turrubales (1), 62 mm. 
Sicydium altum Meek. 
Sicydium altum Meek, Pub. Field Mus., Zodl. Ser., vil, 1907, 149 
(Turrialba, Costa Rica) ;— Regan, Biol. Cent. Amer., 1908, 185. 
Males with the high dorsal fins, the longest spines 3 in body. The 
head of this species is broader and interorbital wider than the preceding. 
Young individuals (40 mm.) have 7 broad vertical bars on the side, 
becoming faint on larger (80 mm.) specimens, and three narrow ones 
on caudal fin. This species is very abundant on the gravelly bottom 
and on the rocks in clear running water. They rest attached to rocks 
by the suctorial disk on the pectoral fins. 
La Victoria (22), 36 to 84 mm.; Parismina (1), 50 mm.; Zent, April 
15 (10), 37 to 80 mm.; Zent, April 12 (5), 53 to 65 mm.; El Guayabo 
(2), 85 to 98 mm. (Alfaro). 
Family Gobiesocide. 
Gobiesox costaricensis Meck. 
Gobiesox costaricensis Meek, Pub. Field Mus., Zodl. Ser., x, 1912, 
74 (Zent, Costa Rica). 
These small fishes can be seen clinging to rocks in clear water in 
considerable numbers, but their capture is very difficult. This species 
is probably a resident of fresh water only. 
Zent, April 12 (3), 50 to 61 mm.; Parismina (1), 41 mm.; Turrubales 
(2), 42 mm. 
