DEC. 28, 1916. FISHES OF PANAMA MEEK AND HILDEBRAND. 353 



to 290 mm. in length. This fish is abundant in all the lowland streams 

 of the Pacific slope of Panama. In this region it is more abundant than 

 its Atlantic congener. What is stated regarding the habits of the 

 foregoing species applies equally as well to the present species. 



This fish is closely related to its Atlantic slope congener, from which 

 it can, however, be readily separated by the larger scales, by the con- 

 stant presence of one more ray in the anal fin and by the smaller and less 

 distinct dark spots on the vertical fins. The body is also slightly deeper 

 anteriorly and the head is narrower. 



Habitat: Pacific slope streams from Lower California south to 

 Ecuador. 



50. Genus Dormitator Gill. 



Prochilus Cuvier, Rgne Animal, Ed. i, II, 1817, 294 (type Sciana 

 macrolepidota Bloch =S#no maculata Bloch). (Name preoccupied.) 

 Dormitator Gill, Proc. Ac. Nat. Sci. Phila., 1862, 240 (type Eleotris gund- 

 lachi PoeySciana maculata Bloch). 



Body elongate, compressed; head broad, flat above; interorbital 

 broad; snout obtuse; mouth moderate, oblique; the jaws anteriorly of 

 equal length; teeth in jaws small, in bands, with compressed tips, none 

 on vomer; gill-openings extending forward to margin of preopercle; 

 gill-rakers well developed, numerous, each arch bearing 2 series; scales 

 present on entire body, upper surface of head, snout and on cheeks 

 and opercles; dorsal fins 2, well separated, the first with 7 feeble spines; 

 caudal fin rounded; ventral fins close together, but separate, with I, 5 

 rays. The vertical fins notably higher in males than in females. This 

 genus, as here understood, consists of two closely related species, which, 

 owing to a great deal of variation among individuals, can scarcely be 

 separated. 



KEY TO THE SPECIES. 



a. Snout short and very broad, its length 4 to 4.35 in head in speci- 

 mens from 60 to 80 mm. in length; mouth very oblique, margin of 

 upper jaw usually slightly above level of lower margin of eye; 

 scales 31 to 35, usually 33, in lateral series, 8 to n longitudinal 

 rows between anterior part of base of second dorsal and anal; 

 ventral fins long, reaching to or past vent, 1.04 to 1.43 in head; 

 pectoral fins reaching vertical from origin of anal, i to 1.23 in 

 head. maculatus, p. 354. 



aa. Snout slightly longer and somewhat narrower, 3.85 to 4.2 in 

 head in specimens 60 to 80 mm. in length; mouth somewhat less 

 oblique, margin of upper jaw on or below level of lower margin of 

 eye; scales 34 to 37, usually 35, in lateral series, n or 12 longitu- 



