174 A KEVISION OF THE ASTACID.E. 



Ohio and its 'affluents are recorded C. Blandingii, var. acuta, C. Clarkii (near the mouth 

 of the river, at New Orleans, etc.). C. Diogenes, C. immunis, var. spinirostris, and C. Palmeri 

 (Obion Co., Tennessee), C. virilis and C. rusticus (from White Eiver, Arkansas), and 

 C. Shufcldtii (New Orleans). 



In the region drained by the Tennessee Eiver are found, (a.) in the upper part of its 

 course, C. Bartonii, dubius (Cumberland Gap), rusticus (Cumberland Gap), Putnami, extra- 

 news, hamulatus, and spinosus (the last three from near the border of the State of Georgia). 

 (b.) In the southern bend of the river, within the State of Alabama, C. Blandingii, var. 

 acuta (Bridgeport and Decatur), C. lutimanus (Bridgeport), immunis (Huntsvillc), Girar- 

 dintius, Alabamensis, c.ompressus, spinosus, and forceps (the last five species from Lauderdale 

 Co. in the northwestern corner of Alabama). 



In the Ohio Eiver and its tributaries (excepting the Tennessee) ate found C. Blan- 

 dingii, var. acuta, C. pdlucidus, Bartonii, Diogenes, argillicola, dubius (Preston Co., W. Ya., 

 Cumberland Gap, Ky.), cornutus, immunis, virilis (Cairo, 111.), rusticus, Putnami, Sloanii, 

 propinqit'us, and C. propinquus, var. Sanbornii. 



In the Mississippi Valley to the north of the Ohio are found C. Blandingii, var. acuta, 

 C. gracilis, C. Diogenes, C. Bartonii, var. robusta (Decatur, 111.), C. medius (Irondale, Mo.), 

 C. Harrisonii (Irondale, Mo.), C. immunis, virilis, rusticus, and propinquus. 



From the Missouri and its affluents come C. simulans (Fort Hays, Kan.), C. Ncbrascen- 

 sis (Fort Pierre, Dakota), C. Diogenes (Colorado, Wyoming, Kansas), C. immunis (Laramie 

 City, Wyo., Leavenworth, Kan.), C. virilis (Laramie City, Wyo., Nebraska, Iowa, Kansas), 

 and Astacus Gambelii (at the confluence of the Yellowstone and the Missouri, and perhaps 

 also in the Platte Eiver drainage in Wyoming). 



But little is known concerning the distribution of crayfishes in the rivers that flow 

 into the Gulf of Mexico west of the Mississippi. 0. Clarkii, simulans, virilis, and rusticus 

 have been collected in Texas ; C. Wiegmanni, Mexicanus, Aztccus (= C. Mexicanus ?), 

 immunis, and Montezumce, in Mexico. 



The island of Cuba affords a peculiar species, 0. Cubcnsis. 



In the great basin of the St. Lawrence Eiver are found C. Blandingii, var. acuta, 

 G. Bartonii, C. Bartonii, var. robusta, C. Diogenes, C. argillicola, C. gracilis, C. immunis, 

 C. virilis, C. rusticus, C. propinquus, C. propinquus, var. Sanbornii, C. propinquus, var. ob- 

 scura, and C. affinis. Of these, G. virilis, rusticus, propinquus, and Bartonii are found in 

 Lake Superior ; C. Blandingii, var. acuta, C. gracilis, Diogenes, immunis, virilis, rus/icus, 

 and propinquus, in Lake Michigan and its affluents; C. argillicola and C. propinquus, in 

 the Lake Huron drainage ; C. Bartonii, C. Bartonii, var. robusta, C. Diogenes, C. argillicola, 

 C. immunis, C. propinquus, C. propinquus, var. Sanbornii, and C. rusticus, in Lake Erie 

 and tributary streams ; in Lake Ontario and its affluents, C. Bartonii, C. Bartonii, var. 

 robusta, C. argillicola, C. propinquus, C. 2'opinquus, var. obscura (Rochester, N. Y.), and 

 C. affinis (Niagara). In the St. Lawrence and its affluents from the lower end of Lake 

 Ontario down to Montreal are found C. Bartonii and C. propinquus ; in Lake Champlaiu 

 and tributary streams, C. Bartonii. 



In the Hudson's Bay water-shed, C. virilis occurs in Lake Winnipeg, Saskatchewan 

 Eiver, and the Eed Eiver of the North. 



The basin of the Great Salt Lake is inhabited by Astacus Gambelii. 



The upper waters of the Columbia Eiver furnish Astacus Gambelii (head of Snake 

 Eiver, Idaho) and A. Klainathcnsis. These are replaced by A. kniusculus and A. Trow- 

 bridgii in the lower part of the Columbia. A. Klamathcnsis is also found in the upper 

 part of the rivers of British Columbia, and as far south as Klamath Lake on the north- 



