. Fresh-water biology. Freshwater biology. A red mite with body circular in outline and usually smooth; with palpi slender in form and richly supplied with hairs and spines, many of them feathered; hind legs without swimming-hairs and allowed to trail motionless behind in swimming. Several species, very closely alUed and gen- erally distributed and often very abundant. Varying in size from about 2 to 5 mm. Fig. 1323. fiy/ow ca:fc7«/e»s (Mtiller), a Euro- fean species- Ventral surface of female. X 7. nner side of right palpus. X 69. Eye-plate. X 59. (Modified from Piersig.) 6 (i) Lateral eyes o
. Fresh-water biology. Freshwater biology. A red mite with body circular in outline and usually smooth; with palpi slender in form and richly supplied with hairs and spines, many of them feathered; hind legs without swimming-hairs and allowed to trail motionless behind in swimming. Several species, very closely alUed and gen- erally distributed and often very abundant. Varying in size from about 2 to 5 mm. Fig. 1323. fiy/ow ca:fc7«/e»s (Mtiller), a Euro- fean species- Ventral surface of female. X 7. nner side of right palpus. X 69. Eye-plate. X 59. (Modified from Piersig.) 6 (i) Lateral eyes of the two sides widely separated and in no case borne on a common eye-plate 7 7 (18) Distal extremity of pal. seg. 4 produced beyond the point of inser- tion of seg. s, the two segments together resembling a pair of shears 8 8 (9) Mandible one-segmented, the terminal portion straight and stiletto- like Family H'sdrachnidae. One genus only Hydrachna LatreiUe Mites of some shade of red or brown, and sometimes spotted with black, with the body glob- ular, soft, and usually papillated; capitulum produced into a snout. Species numerous, occurring in swamps, lakes and ponds every- where and usually common. Varying from i to even 8 mm. in length. Fig. 1324. Hydrachna geographica (Mtiller), a European species, also found in New England. The largest described hydrachnid. Ventral sur- face, female. X 4. Palpus. X16. (Modified from Piersig.) 9 (8) Mandible two-segmented, the terminal segment curved and claw- like Family Hydryphantidae, , . lo. 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
