358 Illinois State Laboratory of Natural History. 

 FAMILY ORCHESTID^. 



I. AliLOROHESTES 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 (Hajden), 611 (1874). 

 —Forbes. Bull. Bl. State Lab. N. H.. No. 1, 5 (1876). 



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

 du Mexique et des Antilles, 58 (1858). 



? Allorchestes Knickerbockeri Bate. Cat. Amphip. Crust. 

 Brit. Mus., 36 (1862). 



Ilab. — Maine, Massachusetts, Connecticut, Florida, Illinois, Wiscon- 

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



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

 (1876). 



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

 (Hayden), 610 (1874). 

 Hab. — Colorado {Smith). 



ORDEE ISOPODA. 



FAMILY ASELLID^. 



I. ASELLUS Geoff. 



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

 No. 1,8 (1876). 



Hob. — Illinois {Forbes). 



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

 —DeKay. Nat. Hist. N. Y., vi, 49 (1844).— Sw27/?. Rep. U. 

 S. Fish Com. for 1872-73, mi.— 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. 



