. Fresh-water biology. Freshwater biology. Small to medium-sized mites, vary- ing in length, from to mm. with surface soft and striate, or with a flexible or hard porous covering; swimming-hairs present. Species few in this country, rare, in northern lakes. Fig . 13 5 2. A traciides spinipes Koch, a species common to Europe and America. Ventral surface, female. X 25- Outer side of left palpus, female. X 103. (Modified from Piersig.) 66 (65) Leg segs. I 5 and I 6 normal Hygrohates KocK Mites varying in size from small to even large, or to ram., brightly colored in many c
. Fresh-water biology. Freshwater biology. Small to medium-sized mites, vary- ing in length, from to mm. with surface soft and striate, or with a flexible or hard porous covering; swimming-hairs present. Species few in this country, rare, in northern lakes. Fig . 13 5 2. A traciides spinipes Koch, a species common to Europe and America. Ventral surface, female. X 25- Outer side of left palpus, female. X 103. (Modified from Piersig.) 66 (65) Leg segs. I 5 and I 6 normal Hygrohates KocK Mites varying in size from small to even large, or to ram., brightly colored in many cases, with- out swimming-hairs, but active, and certain species frequently, if not regu- larly, pelagic. Several species of gen- eral distribution in northern United States and Canada. Fig. 1353- Hygrohates longipalpis fHermann), a species found in North America, Europe and Western Asia. Ventral surface, female. X I3- Outer side, palpus, female. X 125. (Modified from Piersig.) In collecting water-mites witli the Birge net one will almost always find in the collection specimens of another mite of small size, brown in color, with short legs, with the body indistinctly separated into cephalothorax and ab- domen and with a horny body-covering. This belongs to the horny mites or Oribatidac, probably to the genus Nofaspis, and is a vegetable feeder hving on aquatic plants beneath the surface of the water. It can not swim, and wiU either cling to objects at the bottom of the dish or float on the surface. Sev- eral species occur and are generally distributed. The species increase in size and number to the 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: 1684px × 1483px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
