121 FISHES OF SINALOA. 493 



Family GOBIID^E. 



198. Philypnus lateralis Gill. Aijoma de Mar. 

 Common in the Rio Presidio and occasionally taken in 



the Astillero, especially where the fresh water soaks into 

 it. The species is common in fresh waters along the 

 coast, but has not hitherto been noticed at Mazatlan. 



199. Dormitator maculatus (Bloch). Puneca. 

 Rather common in the Rio Presidio and also in the 



brackish waters about the estuary. The young occur in 

 considerable abundance in the mud puddles left by the 

 winter rains or bv the high tides. It reaches in the river 

 a considerable size, and is a food fish of some importance, 

 said to be the most valuable in the Rio Presidio. It is 

 generally common along the coast, as well as everywhere 

 along the Atlantic side. 



200. Eleotris aequidens Jordan & Gilbert. Guavina. 

 Rather scarce in the Rio Presidio, where only one 



voung specimen was obtained by us. A few others were 

 found in brackish waters or muddy places about the es- 

 tuary. 



Blackish everywhere, sides with faint whitish streaks, 

 along rows of scales; a broad blackish lateral band occu- 

 pying whole of side; back and belly paler; traces of faint 

 dark cross -bands; caudal black, with a pale margin and 

 some dark cross -shades; pectorals, dorsals and ventrals 

 more or less barred with black; a whitish bar at base of 

 caudal with a darker one before it. Scales 68; preopercu- 

 lar spine well developed. 



201. Cotylopus gymnogaster (Ogilvie-Grant). 

 Recorded from streams about Mazatlan; not seen by us. 



