Marshall—A New Arrenurus. 
521 
ponds: Tadpole Pond, near Hie village of the same name; a 
smaller pond two miles west; and Morrison’s Pond. All 
seemed particularly well suited for water-mites; but none were 
found excepting in Morrison’s Pond, and there only three in¬ 
dividuals. 
Shell Lake, which is very deep, gave no mites at all. One 
specimen, A. Birgei, was found in Rice Lake, Barron Cbunty, 
a lake which has been made partly artificial by the erection of 
a dam. Rone were found in a small mill-pond in the village of 
St. Croix Falls, St, Croix County. In late August A. globator 
Mull, and A. megalurus Mar. were found in Mirror Lake, Sauk 
County. A collection was made in September in: the mill-pond 
at Whitewater; and another at Tustin, on Lake Poygan, west 
of Oshkosh. In both were found A. globator, A. megalurus, 
and A. Birgei in small numbers. 
Arrenurus caudatus (de Geer). 
Plate XL, Figs, la—lc. 
1879. Arrenurus caudatus Xeuman, Om Sveriges Hydr., Sv. 
Handlingar, Bd. 17, Xv. 3, S'. 85, tab. XII, Fig. 2. 
1882. Arrenurus caudatus Haller, Die Hydrachniden der 
Schweiz, S. 43. 
1887. Arrenurus caudatus Barrels et Moniez, Catalogue des 
Ilydrachnides, S. 24. 
1892. Arrenurus caudatus Piersig, Fine neue Hydrachniden- 
gattung aus dem sach. Erzgebirge, Zool. Anz. Xr. 
405, S. 420. 
1892. Arrenurus caudatus Kramer, Die Tier- und Pflanzen- 
welt des Susswassers, Bd. II, S. 24, Fig. 2 b. 
1893. Arrenurus caudatus Koenike, Hydra chnologische Be- 
richtigungen, Zool. Anz. Xr. 410, S. 20. 
1893. Arrenurus caudatus Piersig, Beitrage zur Hydrach- 
nidenkunde, Zool. Anz. Xr. 431, Si 398. 
1893. Arrenurus caudatus Koenike, Weitere Anmerkungen 
zu Piersigs Beitragen zur Hydrachnidenkunden, 
Zool. Anz. Xr. 435, S. 463. 
1894. Arrenurus caudatus Piersig, Ueber Hydrachniden, 
Zool. Anz. Xr. 443, S'. 109. 
1895. Arrenurus caudatus Kramer, Ueber Benennung eini- 
ger Arrenurus-Arten, Zool. Anz. Xr. 465, S. 1-5. 
