Genus Rhizelmis Chandler, 1954 



Rhizelmis nigra Chandler, 1954. In fast, cool, shaded streams from 2,000 

 to 5,000 feet elevation in central and northern California. 



Genus Stenelmis Dufour, 1835 

 (Several new species will soon be described; surprising records 

 have appeared from southern Idaho and from eastern Oregon.) 



Stenelmis antennalis Sanderson, 1938. Commonly on submerged wood and 



debris (especially under loose bark) in sandy southeastern streams 



from Mississippi to Florida. 

 Stenelmis beameri Sanderson, 1938. Cool, clear Ozark streams of 



Arkansas, Missouri, and Oklahoma; also reported from central and 



eastern Tennessee. 

 Stenelmis hiaarinata LeConte, 1852. Gravelly or rocky streams from 



Vermont to South Carolina, west to Wisconsin and Texas and south- 

 eastern New Mexico. 

 Stenelmis aalida calida Chandler, 1949. In warm spring pool in southern 



Nevada. 

 Stenelmis aalida moapa La Rivers, 1949. In warm streams of southern 



Nevada. 

 Stenelmis conoinna Sanderson, 1938. In eastern streams from North 



Carolina to Quebec. 

 Stenelmis aonvexula Sanderson, 1938. In sandy, gravelly or rocky streams, 



often on submerged wood, from northwestern Florida west to Texas 



and southern Oklahoma. 

 Stenelmis arenata (Say, 1824) . In stream riffles from Alabama and 



northwestern Florida northeastward to New Brunswick and westward to 



Texas and Wisconsin. Tolerant of chlorides but sensitive to sew- 

 age and phosphate wastes. 

 Stenelmis decorata Sanderson, 1938. In streams from South Carolina to 



Maryland and west to Kansas and Wisconsin. Tolerant of sewage and 



phosphate wastes. 

 Stenelmis douglasensis Sanderson, 1938. On wood in lakes in Michigan 



and Wisconsin. 

 Stenelmis exigua Sanderson, 1938. In clear streams of western Arkansas 



and eastern Oklahoma. 

 Stenelmis exilis Sanderson, 1938. In clear streams of western Arkansas 



and eastern Oklahoma. 

 Stenelmis fuscata Blatchley, 1925. From the sandy streams of northern 



and central Florida to wave-washed lake margins in Lake Co. to 



drainage canals of the Everglades. 

 Stenelmis gvossa Sanderson, 1938. In sandy streams from Mississippi to 



Texas and Arkansas, usually beneath sunken logs. 

 Stenelmis humerosa Motschulsky, 1859. In streams from Massachusetts 



south to South Carolina and Tennessee. 

 Stenelmis hungerfordi Sanderson, 1938. Under rocks in fast streams (with 



high calcium content) from northwestern Florida to South Carolina. 

 Stenelmis knobeli Sanderson, 1938. In streams of southwestern Arkansas. 

 Stenelmis lateralis Sanderson, 1938. In streams from Virginia and 



Pennsylvania to northeastern Oklahoma. 



20 



