NORTH AMERICAN SPECIES OF THE GENUS ATAX 257 



1781. Hydrachnse, quas in aquis Daniae palustribus, etc., Lipsiae, 

 1781. (88 pp., 11 pis.) 



Describes 4 sp., Hydrachna crassipes (Atax), H. grossipes (ident. ?) 

 H. spinipes (Cochleophorus), H. vernalis (Cochleophorus). Es- 

 tablished Hydrachna to include all Water-mites. 

 Neuman, C. J. 



80. Om Sveriges Hydrachnider, aus Konigl. Svenska Vet.-Akad. 

 Hndlgr., xvii, (123 pp. 14 pis.). Separate, 1880. 



OSBOEN (H.) AND UNDERWOOD (L.). 



86. Preliminary List of the Species of Acarina of North America. 

 Can. Ent., xviii, 1886, 4-12. 



Refer to "A. humerosa" and "A. ypsilophorus," with the query 

 after each, "where described?" 

 Pfeiffek, Carl. 



24. Naturgeschichte deutscher Land-und Siisswasser-Mollusken. (3 

 parts). Cassel, 1821; Weimar, 1824, '28. 



Vol ii, p. 27-28, describes Atax ypsilophorus as Limnochares an- 

 odontae. 

 Piersig, Rich. 



93a. Beitrage zur Hydrachnidenkunde, Zool. Anz., xvi, 1893. 

 393-399. 



Desc. A. triangularis, n. sp. {Cochleophorus deltoides). 

 94b. Sachsens Wassermilben, Zool. Anz., xvii, 1894, 213-216. 



Lists A. crassipes, A. figuralis, A. intermedins, A. Bonzi, A. 

 ypsilophorus; proposes genus Cochleophorus and lists C. spini- 

 pes, C. deltoides, C. vernalis. 



96. Beitrage zur Kentniss der in Sachsen einheimischen Hydrach- 

 den-Formen. Leipsig, 1896. (71 pp.). 



Chars, genera. — A. ypsilophorus (Bonz), A. intermedins Koen., 

 A. Bonzi (Clap.), A. figuralis Koch, A. crassipes (Miill.), A. acu- 

 leatus Koen., A. tricuspis Koen., C. spinipes (Mull.), C. deltoides 

 Piersig, C. vernalis Koch., C. verrucosus (Koen.), C. callosus 

 (Koen.) 



97. Deutchlands Hydrachniden. Bibliotheca Zoologica, xxii. (5 

 parts issued.) 



Includes the species listed in previous reference. 

 97a. Bemerkungen zur Hydrachnidenkunde. Zool. Anz., xx, 59-61. 

 Proposes new genus Encentridophorus for A. spinifer Koen. 

 from E. Africa, and Najadicola for A. ingens Koen. from 

 Canada. 

 Rathke, Jens. 



1797. Skrivter af Naturhist. selsk., iv, pt. 1, 175. PL x. 1797. 

 Redescribes A. ypsilophorus as Trombidium notatum. 

 Say, Thomas. 



21. An account of the Arachnides of the United States. Jour. 

 Acad, Nat. Sci., Phila., ii, 1821, 59-83. LeConte'sEd. of Writings, 

 1859, ii, 9-21. 



Describes Hydrachna triangularis (prob. = A. ypsilophorus]. 

 17 



