1885.] NATURAL SCIENCES OF PHILADELPHIA. 73 



Dormitator microphthalmus Gill, Proc. Acad. Nat. Sci., Phila., 1863, 

 170 (Panama). 



Habitat. — Pacific Coast of Central America, from Cape San 

 Lucas southward to Panama. 



This species is abundant on the Pacific slope of Mexico and 

 Central America. It differs from D. maculatus in few respects, 

 and should, perhaps, be regarded as a variety of the latter. They 

 have, however, not yet been shown to intergrade. 



3. GUAVINA. 



Guavina Bleeker, Esquissed'unSyst. Nat. Gobioid.,302, 187 4 {guavina). 



This genus is externally distinguished from Eleotris only by 

 the absence of preopercular spine, and by the smaller size of the 

 scales. The skulls in the two genera are, however, strikingly 

 different, and we think that the two groups should be regarded 

 as generically distinct. We know only one species of this genus. 



Analysis of Species of Guavina. 



a. Body stoutish, oblong; mouth oblique; maxillary reaching 

 opposite middle of eye, its length about 3^ in head. 

 Lower jaw little projecting. Teeth in broad bands, the 

 outer ones enlarged. Scales on head imbedded ; those on 

 body very small, ctenoid on sides, cycloid on back and 

 belly, 100 to 110 in a longitudinal series. Isthmus very 

 broad. Pectorals reaching to middle of spinous dorsal. 

 Highest anal ray If in head. Head 3| in length to base of 

 caudal ; depth 4£ to 5£. D. VI, I, 10 ; A. I, 9 or 10. Post- 

 temporals inserted twice as far from occipital crest as in 

 Eleotris pisonis. Parietals ending in a sharp point 

 behind. Preopercular spine none ; a broad thin extension 

 on the lower limb of preopercle taking its place. Lower 

 pharyngeals triangular, normal, rather narrow ; the teeth 

 small. Vomer without teeth. Guavina. 7. 



7. Guavina guavina. 



Eleotris guavina Cuvier & Valenciennes, xii, 223, 1837 (Martinique) ; 

 Giinther, iii, 124, 1861 (Demarara) ; Poey, "Kepert. i, 337, 1867 ;" 

 Poey, Syn. Fish. Cuba, 395, 1868 (Cuba) ; Poey, Enum. Pise. Cuba, 

 127, 1875 (Cuba). 



Habitat — East Coast of tropical America, West Indies, south 

 to Surinam, in fresh waters. 



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