358 Illinois State Laboratory of Natural History. 



FAMILY ORCHESTID.E. 

 I. ALLORCHESTES HELLER. 



1. A. DENTATUS Faxon. Bull. Mus. Comp. Zool., iii, 373, 

 (1876). 



Hyalella dentata Smith. Rep. U. S. Fish Com. for 1872- 

 73, 645, 694; 7th Rep. U.S. Geol. Survey (Hayden), 611 (1874). 

 -Forbes. Bull. 111. State Lab. N. H.. No. 1, 5 (1876). 



?Amphito3 Aztecus Saussure. Mem. sur divers Crust, nouv. 

 du Mexique et des Antilles, 58 (1858). 



?Allorchestes Knickerbocker Bate. Cat. Amphip. Crust. 

 Brit. Mus., 36 (1862). 



Hob. Maine, Massachusetts, Connecticut, Florida, Illinois, Wiscon- 

 sin, Iowa, Michigan, Nebraska, Colorado, Oregon, Lake Superior. 



Var. LNERMIS Faxon. Bull. Mus. Comp. Zool., iii, 373 

 (1876). 



Hyalella inermis Smith. 7th Rep. U. S. Geol. Survey 

 (Hayden), 610 (1874). 

 Hob. Colorado (Smith). 



OEDEE ISOPODA. 



FAMILY ASELLID.E. 



I. ASELLUS GEOFF. 



1. A. BREYICAUDA Forbes. Bull. 111. State Lab. N. H., 

 No. 1, 8 (1876). 



Hob. Illinois (Forbes). 



2. A. COMMTOIS Say. Jour. Phila. Acad., i, 428 (1817). 

 DeKay. Nat. Hist. N. Y., vi, 49 (1844). Smith. Rep. U. 

 S. Fish Com. for 1872-73, 65!. Hay. Amer. Nat. xvi, 241 

 (1882). 



?A. vulgaris Gould. Invertebrata of Massachusetts, 337 

 (1841). 



A. militaris Hay. Bull. 111. State Lab. N. H., No. 2, 90 

 (1878). 



Hob. Connecticut, Massachusetts, New York, Pennsylvania, Indi- 

 ana, Illinois, Michigan, Mississippi. 



