Jordan and Evermann. Fishes of North America. 2191 



st. Inner edge of shoulder girdle with 2 or 

 3 conspicuous dermal flaps; pre- 

 orbital region very long; premax- 

 illary and maxillary strong ; inter- 

 orbital groove with a conspicuous 

 median crest; scales rather small 

 (45 to 70.) AWAOUS, 815. 



qq. Dorsal spines 7 or 8 (very rarely 6, especially in 



Eucyclogobius.) 



u. Scales large, ctenoid ; shoulder girdle with- 

 out dermal flaps. 



v. Sides of head scaled; soft dorsal and 

 anal rather short, of 11 to 14 rays 

 each; deep-water species. 



BOLLMANNIA, 816. 



vv. Sides of head naked; soft dorsal and 

 anal short, of 10 to 12 rays each; 

 shore species. ABOMA, 817. 



uu. Scales very small, cycloid or nearly so. 



iv. Inner edge of shoulder girdle without 

 fleshy processes; head naked; 

 body more or less compressed; 

 mouth very oblique ; teeth strong ; 

 interorbital groove with or with- 

 out a median ridge. Vertebrae 

 11 + 15 or 16 ; soft dorsal and anal 

 long, of 15 to 17 rays each. 

 x. Body chiefly scaly, anteriorly as 

 well as posteriorly. 



MlCROGOBIUS, 818. 



xx. Body naked anteriorly, scaled 



posteriorly. ZALTPNUS, 819. 



ww. Inner edge of shoulder girdle with 



2 or 3 dermal flaps, or processes, 



as in Awaous. 



y. Head naked, the interorbital 

 groove with the median 

 ridge high, not extending 

 forward to orbit; body 

 rather robust; soft dorsal 

 and anal short ; fresh- water 

 species. 



EUCYCLOGOBIUS, 820. 

 yy. Head scaled like the body; 

 the interorbital groove 

 with the median ridge 

 little developed ; soft dor- 

 sal and anal long; body 

 elongate; marine species. 

 LEPIDOGOBIUS, 821. 



pp. Maxillary much produced backward, extending 

 beyond the gill opening in the adult ; skull com- 

 paratively long, gradually (not abruptly) broad- 

 ened behind orbits ; median crest of cranium well 

 developed; scales small, cycloid; head naked, 

 occipital region narrowed forward ; supraorbital 

 and temporal crests not continuous. 



