1885.] NATURAL SCIENCES OF PHILADELPHIA. 71 



2. DOBMITATOR. 



Prochilus Cuvier, Regne Animal, ed. i, 1817 (mugiloides), (preoccupied). 

 Dormitator Gill, Proc. Acad. Nat. Sci. Phila., 1862, 240 (gundlachi = 



maculatus). 



This genus is not adopted by Dr. Gunther, but it seems to us 

 well founded, its peculiarities in dentition being important. The 

 name Prochilus at first given to this group is preoccupied by 

 Prochilus of Illiger, a genus of mammalia, as well as by the 

 prebinominal Prochilus of Klein, which belongs to the Poma- 

 centridae. 



The known species of this type are very closely related and 

 should perhaps be regarded as geographical varieties of a single 

 one. 



Analysis of the Species of Dormitator. 



Common Characters. — Body short, robust ; head broad and flat 

 above ; mouth little oblique ; maxillary reaching to anterior 

 margin of orbit ; lower jaw little projecting ; no teeth on vomer ; 

 scales large, ctenoid, 30 to 33 in a longitudinal series ; skull 

 much as in Eleotris, but everywhere broader. D. VII-1, 8 ; A. I, 

 9 or 10 ; no spine on preopercle ; post-temporals inserted midway 

 between occipital crest and edge of skull ; supraoccipital crest low. 



a. Scales large, becoming much smaller on belly ; 25 series on a 

 median line from base of ventrals to vent; 18 series across 

 breast from pectoral to pectoral ; 18 on a median line from 

 posterior border of orbit to dorsal. Interspace between 

 dorsals equal to orbit. Highest anal ray If in head ; highest 

 dorsal ray 1^ in head. 33 scales in a longitudinal series. 



Maculatus. 5. 

 aa. Scales larger than in maculatus, not much smaller on belly ; 

 18 series on a median line from ventrals to vent; 13 series 

 from pectoral to pectoral; 16 on a median line from pos- 

 terior border of orbit to front of soft dorsal ; interspace 

 between dorsals less than diameter of orbit. Highest anal 

 ray 1| in head ; highest dorsal ray equals head. 31 scales 

 in a longitudinal series. Latifrons. 6. 



5. Dormitator maculatus. 



Sciama maculata Bloch, "Ichth., tab. 299, f. 2," 1790 (West Indies); 



Bloch & Schneider, Syst. Ichth., 80, 1801 (copied). 

 Eleotris maculatus Gunther, iii, 112, 1861 (West Indies ; Trinidad ;. 

 Demerara); Gunther, Fish. Cent. Am., 440, 1869 (Anamahal). 



