154 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. VII. 



Family Siluricla\ 



Ictalurus punctatus (Rafinesque) . PUYON. 

 Roderiguez (8), 100 to 165 mm. 



Family Catostomitlre. 



Carpiodes microstomus Meek. 

 Sabinas (3) , 65 to 1 1 5 mm. 



Carpiodes elongatus Meek. BESUGO. 

 Roderiguez (3), 130 to 310 mm. 



Cycleptus elongatus (Le Sueur). 



This fish is nowhere abundant, and has previously been known 

 only from the larger streams of the Mississippi valley. The finding 

 of it in the Rio Grande basin in Mexico considerably extends its 

 known distribution. 



Head 3.75; depth 5.15; snout to dorsal fin 2.06; dorsal rays 32; 

 scales 55. 



Color uniformly light olive ; lower two-thirds of tail black. 



Roderiguez (3), 48 to 52 mm. 



Moxostoma congestum (Baird & Girard). 

 Sabinas (4), 43 to 53 mm. 



Family Cypriniclse. 



Pimephales notatus Rafinesque. 

 Sabinas (4), 40 to 53 mm. 



Leuciscus nigrescens (Girard). 



San Miguel (2), 115 to 125 mm.; Jesus Maria (70), 55 to 75 mm. 



