. Fresh-water biology. Freshwater biology. 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
. Fresh-water biology. Freshwater biology. 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.). 64 (45) Epimera in three groups, epp. I being fused together behmd the capitulum, the groups also often close together in the male. Subfamily Hygrobatinae . 6$. 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. ]
Size: 1618px × 1545px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
