COLLECTING AND PRESERVING INSECTS BANKS. 



21 



considerable number can make noises when disturbed. Most of 

 their larvae have short legs, but some of the wood-boring kinds are 

 apodous, or legless. In nearly all the last segment is not corneous 

 or toothed, but in one group of leaf-beetles (Cassidae) the last seg- 

 ment, as well as other segments, shows a 

 marvelous development of spines and pro- 

 jections. The long-horned beetles (Ceram- 

 bycidse) (fig. 120), the leaf -beetles (Chrys- 

 omelidae) (figs. 121, 124), of which the 

 potato "bug" (fig. 41) is an example, and 



a o 



FlG. 40.— A LONGICORN, PBIONUS FlG. 41.— THE COLORADO POTATO "BUG," LEPTINOTARSA 10-LIN- 



laticollis. eata: a, Beetle; b, larva or grub; c, pupa. 



the bean and pea weevils (Bruchidae) (fig. 125) belong to this section. 

 Rhynchophora, or weevils. This section comprises an enormous 

 number of compact beetles, readily known by the snout or beaklike 

 head, called a rostrum. The tarsi are four-jointed. The mouth- 

 parts are very small and at the tip of the beak, and the antennae 

 are often slightly clavate and geniculate or bowed. The elytra are 

 usually very hard, and in a number of species there are no hind wings. 

 Most of them belong to two or 

 three families, Curculionidae 

 (fig. 42), Calandridae (fig. 119), 

 orOtiorhynchida?, but are simi- 

 lar in appearance. Both adults 

 and larvae are phytophagous 

 feeding on leaves, on the seeds, 

 on fruits, in wood, or on plants. 

 The larvae are grublike, soft- 

 bodied, usually curved, without 

 legs or with only very short 

 ones, and the last segment is 

 not hardened or produced. The 

 famous cotton-boll weevil (An- 

 ihonomus grandis), the plum curculio (Conotrachelus nenuphar) (fig. 

 43), the grain weevil (Oalandra oryza), and many other injurious 

 beetles belong to this section. They are very abundant in tropical 

 countries, and often of very brilliant coloration. Allied to them are 

 the Scolytidae, barkbeetles, or engraver-beetles (fig. 161), which are 

 very destructive to timber. They are small and dark colored, with 



Fig. 42.— A chestnut weevil, Balani XI - R] I n ; 

 a, Top; b, side; c, head. 



