GOBIES OF THE PHILIPPINES 



<f. Sides of head naked, or with only a few small 



scales on upper part of opercle. 

 f 1 . Tongue deeply notched, head depressed ante- 

 riorly; chin strongly projecting. 



Glossogobius. 

 t*. Tongue truncate or rounded at tip; chin not 



strongly projecting. 



it 1 . Rear margin of preopercle toothed; first 

 spine of both dorsals hard, stiff, sharp- 

 pointed Oplopomus. 



it 2 . Rear margin of preopercle never toothed; 

 dorsal spines never hard, stiff, sharp- 

 pointed. 

 v\ Head with a high thin skinny crest. 



Cristatogobius. 

 v\ No thin high skinny crest on head. 



w 1 . Head very deep, subglobose, body short, 

 plump; canines behind symphysis of 



lower jaw Paragobiodon. 



1V 1 . Head not subglobose; no symphysial 



canines behind teeth in lower jaw. 

 x 1 . Gobies of ordinary size and appear^ 

 ance; neither minute nor with nu- 

 merous pale or white vertical cross- 

 bands Rhinogobius. 



*. Either minute and plain, or small 

 and crossbanded with pale stripes. 

 y 1 . Body before dorsal naked. 



z 1 . Color plain; adults minute, 7.5 

 to 16.5 millimeters long; scales 

 22; dorsal VI, 1-6 or 7; anal 



I, 5 Pandaka. 



z 2 . Color red or brown, seven or 

 eight vertical crossbands on 



anterior half Zonogobius. 



if. Body scaled before dorsal; twelve 



vertical white crossbands from 



snout to caudal.. Cingulogobius. 



p 2 . First dorsal spines seven or eight; scales 28 or 29 



in Philippine species Aboma. 



o 2 . Caudal fin lanceolate and greatly lengthened. 



aa 1 . Maxillary normal; scales 26 to 29 Aparrius. 



oa 1 . Maxillary greatly prolonged backward; scales 36 



to 38 , Waitea. 



n 2 , Scales small to minute, 40 or more, mostly 50 or more 

 except in Aparrius, Tamanka, and Tukugobiug. 



66 1 . Ventrals very short, rounded, not adnate; frenum 



thick, bilobed or deeply crenate; first dorsal 

 spines seven or six; scales 36 to 44.... Tukugobius 



66 2 . Ventrals and frenum of ordinary type. 



