National Geographic : 1929 Jul
INSECT RIVALS OF THE RAINBOW Predaceous Diving Beetle Family (Dytis cidac). There are some 300 species of this family of predaceous carnivo rous diving beetles in America. They get their name of water-tigers from the persistent man ner in which their larvae search for living food. Research indicates that the adults hibernate in mud, under water. It is believed that the water tigers were once dry-land dwellers. Nagel states that the water-tigers secrete a di gestive fluid which they inject into the body of their victims, turning the latter's flesh to broth. On this they sup at their pleasure. The mature beetles live for a long time, one entomologist having kept a Dytiscus three and a half years in perfect health in a glass vessel filled with water. He fed it bits of raw meat. The species reproduced are: Dytiscus fasciventris Say. (Plate XIX, figure 9), and Cybister fimbrio latus Say. (Plate XIX, figure Ii), both found in North America. Darkling Beetle Family (Tenebrionidae). These insects occur chiefly in dry and warm regions. Most of the American species, of which there are more than 400, occur in the southern section of the United States. The family in cludes the Tenebrio meal fungus beetle, and the pinac ter defend themselves when vating the hind part of the b( an oily fluid. After being atta clumsily, presenting an absu the end of the body held as The species reproduced metallicus Fab. (Plate XX, f topesus cupreus Fab. (Plat found in Africa. Click Beetle Family (El beetles form a most interestir family. There are about 7,oc which some 350 are found in The larvae of the click be iar wire-worms which often age to crops just beginning meadow grass, wheat, and Photograph by Paul Griswold Howes A LARVAL WATER-TIGER FEEDING ON A YOUNG EEL The insect fastened its jaws in the flesh of the eel and swam with great effort to a higher perch in the aquarium. Here it sucked the body juices of the victim until it became white. The water-tigers are among the most ferocious of all the insects. worm, the forked severely from the periodic invasion of the wire ate bugs. The lat- worms. The beetles fly about the fields in the Disturbed by ele- late spring, depositing their eggs in plowed or ody and discharging grassy ground. backed they walk off In Cuba there are phosphorescent species rd appearance with which emit a strong greenish light. Many high as possible, women keep them alive in little lace pockets, are: Metallonotus or fastened to delicate golden chains. igure 5), and Odon- The species reproduced are: Chalcolepidius e XX, figure ii), lacordaireiCand. (Plate XXI, figure 8), found in Mexico and Nicaragua; Alaus lusciosus Hope. (Plate XXI, figure io), found in Mexico and ateridae). The click southwestern United States; Semiotus imperi ig and cosmopolitan alis Guer. (Plate XXI, figure II), a native of o known species, of South America, especially Colombia, Venezu North America. ela, and Peru; Campsosternus gemma Cand. etles are the famil- (Plate XXI, figure 12), a native of China; do so much dam- Chalcolepidius rubripennis Lee. (Plate XXI, g to grow. Corn, figure 13), a native of Lower California and other cereals suffer Honduras.