196 robert h. wolcott: 



that of Cochleophortcs. It is, however, much broadened trans- 

 versely, and each genital plate is triangular in outline. There 

 are no spines about the genital opening of the female and the 

 lack of these is correllated with the method of oviposition, A. 

 (N.)ingens Koenike depositing its eggs in masses between the 

 gills and not in them. 



Of the genus Atax as thus defined there have been hereto- 

 fore described 22 valid species, distributed geographically as 

 follows: 



From Europe, 8 : A. aculeatus Koenike (Germany), A. Bonzi 

 Claparede (Germany, Sweden, Switzerland, France, Russia) 

 A. crassipcs (Miiller) (Finland, Russia, Switzerland, Denmark, 

 Germany, Italy, France), A. figuralis Koch (Germany), A. 

 tut' run dins Koenike (Belgium, Germany, Russia), A. limosus 

 (Koch) Berlese (Italy, Germany), A. triouspis Koenike (Ger- 

 many) .1. ypsilophorus (Bonz) (Sweden, Germany, Switzer- 

 land, France). 



From Asia, 3: A. orassipes (Miiller) is recorded from Pales- 

 tine, and A. Sch/mcbckeri Koenike was described from Shanghai, 

 China, while Daday has recently published one from Ceylon, 

 A. swigalensis, while his A. nodoms belongs to Cochleophorus. 



From Africa, 1 : A. lynceus Koenike from East Africa. 



From Brazil, (3: A. Ampidlar'nv Koenike, A. Jissipes 

 Koenike, A. Jhermgi Koenike, A. perforates Koenike, A. 

 proourvipes Koenike, A. rugosus Koenike, all from the 

 province of Rio Grande do Sul. 



From Guatemala, 3: A. alticola Stoll, A. dentipalpis Stoll 

 and A. septem-maeulatus Stoll. 



A. alzatei Alf. Duges, described from Mexico, is a species 

 of Curvipes. 



From North America, A. ypsilophorus (Bonz) has several 

 times been recorded and Koenike adds to it from Canada A. 

 fossulatus Koenike and A. (iT.) mgens (Koenike). 



Our own literature is not entirely wanting in references to 

 this genus, but the work done by Americans has for the most 

 part been practically worthless, while efforts made to secure 

 the original specimens have resulted in failure, as would be ex- 



