256 CALIFORNIA ACADEMY OF SCIENCES. 



line; (3) Morse Canon, and (4) Rucker Canon, small 

 creeks in the Chiricahua Mountains, Arizona, which be- 

 long to the Yaqui Basin, although their waters disappear 

 in the sand long before reaching any direct tributary of 

 that stream. Mr. Price says that the region is much ele- 

 vated, and, except in the mountains, nearly barren. The 

 courses, of the streams of Rucker and Morse canons, and 

 others similar in which he did not collect, can be traced 

 for several miles into the desert, through which the water 

 doubtless flows during freshets, but there is no evidence 

 that it has reached the Yaqui in recent years. 



Mr. Price's collection adds the family Siluridas and the 

 genus Campostoma to the list of types found in Pacific 

 waters, this being the most northern record of a fresh 

 water catfish on the Pacific slope, and the first record of 

 Campostoma from the west slope. The species has been 

 named Campostoma pricei by Jordan & Thoburn, but the 

 species seems to be identical with Campostoma ornatum 

 of the Rio Grande basin, an unexpected and curious fact, 

 as the two basins are separated by the continental divide. 

 The basin is more closely connected with that of the Gila, 

 all of the species found in the former, excepting the new 

 catfish and the Campostoma being found in the latter. 



Family SILURID^. 

 Villarius Rutter, new genus. 



Allied to Ameiurus, differing in the presence of scat- 

 tered cilia on the sides. 



Backward process from occipital short, broad, emar- 

 ginate, connected by ligament with the first interspinal 

 buckler. In adults, the distance between this process 

 and the buckler is equal to the length of the former; in 

 young specimens the process overlaps the keel on the 

 underside of the buckler. Head narrow, width of in- 



