184 Illinois State Laboratory of Natural History. 



D. reighardi Marsh has been recorded only from New 

 Lisbon, Wisconsin. 



D. mississippiensis Marsh is common in Mississippi, and 

 has been found in Florida in connection withD. albuquerquen- 

 sis Herrick. 



D. tyrrelli Poppewas described by the author of the species 

 from Summit Lake, and by Lilljeborg, under the name D. 

 fresnanus, from Fresno, near Centreville, Cal. 



I), clavipes n. sp. is described in this paper from West 

 Okoboji Lake, Iowa. 



