. Lessons in nature study. Nature study. 72 NATURE STUDY covers readily finds its way into the beetle's body. The water- scavenger beetle carries most of its air supply on its under or ven- tral surface, where it is held in a lot of fine short hairs. The air gives the under side of the beetle a shining silvery appearance. The air is held by the fine hairs by virtue of the surface film. If you dip a bit of cloth having a pile, as velvet, into water, you will see that it retains underneath the water a nearly complete coating of air. The under side of the water-scavenger beetle is covered in plac
. Lessons in nature study. Nature study. 72 NATURE STUDY covers readily finds its way into the beetle's body. The water- scavenger beetle carries most of its air supply on its under or ven- tral surface, where it is held in a lot of fine short hairs. The air gives the under side of the beetle a shining silvery appearance. The air is held by the fine hairs by virtue of the surface film. If you dip a bit of cloth having a pile, as velvet, into water, you will see that it retains underneath the water a nearly complete coating of air. The under side of the water-scavenger beetle is covered in places with a fine pubescence which acts as the pile of the velvet does. Kill one of the beetles and examine it. How many wings has it ? Note that the hind wings, which are larger than the front wings and are thin and membraneous, are folded both longi- tudinally and transversely underneath the stiff, horny fore wings. The hind wings are the true flying wings, the fore wings being chiefly used as a firm protecting covering for the hind wings when the beetle is in the water. Altho the water-beetles live naturally in water, they are provided with wings w-ith which they are en- abled to escape from a drying pond or from a pond which be- comes over stocked with their kind. There are two kinds of water- bugs as well as two kinds of Some of the bugs swim with back downward, i. e., upside down,and are called back- swimmers; the others swim in normal position with back upper- most and are called water-boatmen, also, in their markings, the water-boatmen (fig. 45), hav- ing the back greenish gray with a fine black mottling,. Fig. 44. A. Back-swimiiier (.\,'fonr^fa). The two kinds 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 Jenkins, Oliver Peebles; Kellogg, Vernon L. (Vernon Lyman), 1867-1937.
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