. Fresh-water biology. Freshwater biology. THE WATER-MITES (HYDRACARINA) 867 38 (37) Genital area with numerous acetabula on each side. Albia Thon 1899. A mite of medium size, averaging about I mm. in length, with elliptical, strongly compressed body; swimming- hairs present. One North American species, rather rare, in lakes of northern states, frequently pale greenish in color. This is identical with the only Euro- pean species, A. stationis Thon, or very closely related. Fro. 1339, Albia stationis Thon. Ven- tral surface, female. X 31. Outer side, palpus, female. (After Then.) 39 (24) Body h
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. Fresh-water biology. Freshwater biology. THE WATER-MITES (HYDRACARINA) 867 38 (37) Genital area with numerous acetabula on each side. Albia Thon 1899. A mite of medium size, averaging about I mm. in length, with elliptical, strongly compressed body; swimming- hairs present. One North American species, rather rare, in lakes of northern states, frequently pale greenish in color. This is identical with the only Euro- pean species, A. stationis Thon, or very closely related. Fro. 1339, Albia stationis Thon. Ven- tral surface, female. X 31. Outer side, palpus, female. (After Then.) 39 (24) Body highly arched, in some cases laterally compressed, with no such dorsal and ventral plate. Subfamily Lebertiinae. 40 Legs with swimming-hairs except in certain species of Lebertia. i^d (41) Leg IV with claws at tip, epimera only partly fused. Lebertia Neuman 1880. Medium-sized mites, varying in length from 0.8 to 1.5 mm., with ovoidal body, the surface of which is soft or hard, in some cases with small flecks of chitin, usually striate, but rarely papillate; capitulum developed more or less into a short snout. A genus of frequent occurrence in colder waters, represented by several closely allied species which have only been recently recognized as distinct. Fig. 1340. Lebertia tau-insignita (Lebert), of various authors, Z. dubia Then. This species was referred to North America by Koenike in 1895, but he has re- cently identified three species in the material he studied, all of them hitherto undescribed. Ventral siuface of female. X 19. Outer side, palpus, female. X 70. (Modified from Piersig.) 41 (40) Leg IV without claws at the tip, ending in a sharp point, epimera completely fused. 42. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint au