At night many moths may be caught by making a paste of sugar and water (unrefined sugar is best) and painting it upon tree trunks with a brush after sunset. The paste should cover a space two inches wide and several inches long. After dark seek these places cautiously with a lantern and moths will be found sucking the paste; these may be caught with the killing bottle if you move carefully so as not to frighten them; they do not seem to mind the light of the lantern. Electric street-lights attract many insects which may be caught in the net. A lamp set in an open window is also a very good lure on warm nights in the spring and summer. ARRANGING THE INSECTS IN BOXES. [Illustration: _Fig. 136. a, Cricket. b, Grasshopper._] After collecting insects comes the desire to arrange them properly, putting together in neat rows those that resemble each other. To classify insects correctly requires much study. The scope of this leaflet admits of only a few suggestions about the most common insects. _Dragon Flies._--There are many kinds of these, but they all have four wings, finely netted and transparent, the hind wings being as large or larger than the front wings. These are perfectly harmless insects. _Grasshoppers, Crickets and Katydids._--These are known to all, Fig. 136. There are two families of grasshoppers: those with long horns or antennæ and those with short antennæ. Katydids, crickets, cockroaches and walking-sticks are near relatives to the grasshoppers. _Bugs._--These insects have the front pair of wings thick and heavy at the base and thin and transparent at the tips, Fig. 137, _b_. The squash-bug, the chinch-bug, and the electric-light bug are examples of these. Some bugs have the front wings entirely thin and transparent and sloping like a steep roof over the back of the insect, like the cicada, Fig. 137, _a_; and the Brownie bug, Fig. 137, _c_, _d_. [Illustration: _Fig. 137. a, Cicada. b, Stink-bug. c, Leaf-hopper. d, Leaf-hopper--front view._] [Illustration: _Fig. 138. Beetles--showing the pin through the right wing cover. a, Snapping beetle. b, Wood-boring beetle. c, Water beetle._] [Illustration: _Fig. 139. Flies--showing the knobs just below the wings. Note that flies have only two wings. a, Crane fly. b, Pomace fly--enlarged._] _Beetles._--These have hard wing-covers which meet in a straight line down the back and have a pair of thin wings folded under them, Fig. 138. The "June bug" or "May beetle" and the potato beetle are good examples of beetles. [Illustration: _Fig. 140. a, Wasp. b, Bee. Note these have four wings._] [Illustration: _Fig. 141. The Red Admiral butterfly. Note the knobbed antennæ._] _Flies._--These have only two wings, usually transparent. Behind each of these wings a short thread with a knob on it extends out on each side of the body instead of hind wings, Fig. 139. House-flies, horse-flies and mosquitoes are examples of flies.