. Fresh-water biology. Freshwater biology. THE WATER-MITES (HYDRACARINA) 86s 29 (28) Genital cleft flanked by two large movable valves, and also ace- tabula set free in the body surface. Koenikea Wolcott 1900.. A beautiful mite of striking form, being greatly compressed and actualiji concave dorsally; with swimming- hairs. Brightly and variously colored. One widely-distributed species, K. concava Wolcott, adapting itself to varied conditions, and often common. Of small size measuring 0.6 to 0.7 mm. in length. Fig. 1334. Koenikea concava Wolcott. Epimeral field and genital area, male. X 65. Inn
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. Fresh-water biology. Freshwater biology. THE WATER-MITES (HYDRACARINA) 86s 29 (28) Genital cleft flanked by two large movable valves, and also ace- tabula set free in the body surface. Koenikea Wolcott 1900.. A beautiful mite of striking form, being greatly compressed and actualiji concave dorsally; with swimming- hairs. Brightly and variously colored. One widely-distributed species, K. concava Wolcott, adapting itself to varied conditions, and often common. Of small size measuring 0.6 to 0.7 mm. in length. Fig. 1334. Koenikea concava Wolcott. Epimeral field and genital area, male. X 65. Inner side, palpus, male. X 278. Side view, capitulum and rostrum, female. X 277. (After Wolcott.) 30 (27) Rostrum short 31 31 (36) Suture between the dorsal and ventral plates continuous, completely enclosing the dorsal plate, or open posteriorly 32 32 (35) Acetabula lying near the genital cleft, no modification of leg IV in the male 2>^ 33 (34) Ep. IV quadrilateral in form Mideopsis Neuman 1880. A mite of bright colors, with body almost circular in outUne, slightly concave dorsally; a short rostrum; swimming-hairs; 3 acetabula on each side, outside of which are narrow, sickle-shaped flaps. One species, M. orbicularis (MuUer), common to Europe and America and widely distributed in this country. Of medium size averaging about i mm. in length. Fig. 1335. Mideopsis orbicularis (Miiller). Ventral sur- face, female. X 23. Outer side, right palpus. X123. (Modified from Piersig.J. 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 author. New York, John Wiley & sons, inc. ; [etc. , etc. ]