. Fresh-water biology. Freshwater biology. THE WATER-MITES (HYDRACARINA) 873 62 (63) Medial margin of ep. IV reduced to merely a medial angle which forms a common angle with the medio-posterior angle of ep. Ill; leg segs. IV 5 and IV 6 of male modified. Tiphys Koch Rather small mites, in length from to i mm., with swimming-hairs and the hind leg of the male strikingly modified. Few North American species, rare, in our northern lakes, as yet not studied. Tiphys liUaceus (Miiller), the most common European species. Ventral surface, female. X 28. Outer side, right palpus, fe
. Fresh-water biology. Freshwater biology. THE WATER-MITES (HYDRACARINA) 873 62 (63) Medial margin of ep. IV reduced to merely a medial angle which forms a common angle with the medio-posterior angle of ep. Ill; leg segs. IV 5 and IV 6 of male modified. Tiphys Koch Rather small mites, in length from to i mm., with swimming-hairs and the hind leg of the male strikingly modified. Few North American species, rare, in our northern lakes, as yet not studied. Tiphys liUaceus (Miiller), the most common European species. Ventral surface, female. X 28. Outer side, right palpus, female. X 123. (Modified from Piersig.) 63 (62) Medial margin of ep. IV not reduced, and, owing to the angle on the posterior margin, ep. IV more or less clearly five-sided. Fiona Koch 1837. Oval or elliptical forms of various sizes, from to 3 mm. long, often brightly colored, with swimming-hairs, and with char- acteristic modifications of leg segs. III 6 and IV 4 in the male, the latter serving to assist in grasping the female in pairing, the former to carry the semen to the female genital opening. Hardy, active mites, adapting themselves to a great variety of conditions. More than twenty American species, generally dis- tributed over the continent. Fig. 1351. Fiona rufa (Koch), a European species. Ventral surface, female. X 22. Outer side, palpus, female. X 77- (Modified from Piersig.) Fiona constricta (Wol- cott), an American form. Leg seg- ment IV 4, male. X 107. (After "Wolcott.). 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 Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
