350 Field Museum of Natural History — Zoology, Vol. X. 



gg. Head compressed; eyes lateral; head (with the exception of 

 snout) and chest scaly. Hemieleotris gen. nov., p. 364. 



aa. Ventral fins united, forming a sucking disc. 



h. Teeth in the jaws in narrow bands; ventral disc longer than wide, 

 free from abdomen; shoulder girdle with 2 or more dermal flaps 

 projecting into gill-cavity. Awaous, p. 365. 



hh. Teeth in upper jaw in a single, close-set series, slender, tricuspid, 

 bicuspid or simple, curved inward; lower jaw with 2 series of 

 teeth, the outer series nearly horizontal, partly or completely 

 hidden in the gums, second series erect, pointed; ventral disc 

 circular, more or less adnate to abdomen; no dermal flaps on 

 shoulder girdle. Sicydium, p. 369. 



49. Genus Philypnus Cuvler & Valenciennes. 



Philypnus Cuvier & Valenciennes, Hist. Nat. Poiss., XH, 1837, 255 



(type Gohiomorus dormitor Lac^p^de) . 

 Lemhus Gunther, Cat. Fish. Brit. Mus., I, 1859, 505 (type Lembus 



niaculatus Gunther). 



Body elongate, anteriorly subcylindrical, posteriorly compressed; 

 head more or less depressed above; mouth large; lower jaw projecting; 

 teeth small, in bands on jaws and on vomer; gill-opening large, extending 

 forward to under eye; scales rather small, ctenoid, covering body and 

 most of head; dorsal fins 2, well separated, with VI-I, 9 rays; caudal fin 

 rounded; anal fin with I, 9 or I, 10 rays. 



This genus consists of but two species, both of which usually inhabit 

 lowland streams. 



KEY TO THE SPECIES. 



a. Scales small, 61 to 64 in lateral series from upper angle of gill- 

 opening to base of caudal; anal rays I, 9; vertical fins with rather 

 large black spots, forming cross-bars. dormitor, p. 350. 



aa. Scales larger, 56 to 59 in lateral series; anal rays I, 10; vertical 

 fins with small and less distinct blackish spots. 



maculatus, p. 352. 

 80. Philypnus dormitor (Lacepede). 



Gohiomorus dormitor Lacdp^de, Hist. Nat. Poiss., H, 1798, 599 (Mar- 

 tinique, from a drawing by Plumier); Jordan & Eigenmann, Proc. 

 U. S. Nat. Mus., IX, 1886, 482. 

 Platycephalus dormitator Bloch, Syst. Ichthyol., 1801, PI. 60, t. 12 (Mar- 

 tinique) . 

 Eleotris dormitatrix Cuvier, Regne Animal., Ed. 2, H, 1829, 246; Gunther, 

 Cat. Fish. Brit. Mus., HI, 1861, 119. 



