. Bulletin - United States National Museum. Science. Fig. 82.—An aquatic sieve net. as steadv in use as one with stiff wire, but will last a lono- time and are cheap. They can be obtained in various sizes and with nets of several kinds. Mr. Viereck has used with success a net made as follows: An ordi- nary insect net with an open bottom which has two rings close together. To this bottom is fastened a small bag with drawstring to close it tightly between the two bottom rings. The insects swept, fall into the bottom bag, which may be removed and placed in a cyanide jar. Another small bag is put
. Bulletin - United States National Museum. Science. Fig. 82.—An aquatic sieve net. as steadv in use as one with stiff wire, but will last a lono- time and are cheap. They can be obtained in various sizes and with nets of several kinds. Mr. Viereck has used with success a net made as follows: An ordi- nary insect net with an open bottom which has two rings close together. To this bottom is fastened a small bag with drawstring to close it tightly between the two bottom rings. The insects swept, fall into the bottom bag, which may be removed and placed in a cyanide jar. Another small bag is put on the net, and one can go on collecting while the first lot of insects is being killed by the cyanide. This apparatus will be especially useful in collecting Homoptera. The umbrella.—An umbrella can be used to great advantage in collecting insects from foliage and dead twigs. If the handle is jointed, as shown in the illustration (fig. 84), it is more convenient. The inverted umbrella is held in the left hand under the branch, and with a stick in the right hand one can suddenly jar the branch, so that the insects clinging to the leaves or twig will be dis- lodged and fall into the umbrella. The branches should be jarred vertically and not horizontally, else some insects will be thrown beyond the um- brella. A curved handle to the umbrella is best, as with it one may often reach and pull down a bough, while a suitable stick is not always quickly found. A small cyanide vial with a quill through the cork is the best instrument to take insects from the umbrella. A substitute for the umbrella, and in many cases better than it, is the beating cloth. It consists of a piece of common unbleached cot- ton cloth, 1 yard square, to each corner of which a loop of stout twine is sewed, or a corner turned over. Upon reaching the woods, two straight sticks, each about 5 feet in length, and not too heavy, but. Fig. 83.—A fokceps net. (After Kie- senwetter.). Please note that these images
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
