200 COLEOPTERA 



sides of the body, so that, if they are elevated a little, the wings 

 can be protruded. This is the mode of flight adopted by most 

 Cetoniides, but the members of the group Trichiini fly in the 

 usual manner. In Britain we have only four kinds of Cetoniides ; 

 they are called Rose-chafers. The larvae of C. floricola and some 

 other species live in ants' nests made of vegetable refuse, and it 

 is said that they eat the ants' progeny. Two North American 

 species of Euphoria have similar habits. The group Cremasto- 

 chilini includes numerous peculiar Insects that apparently have 

 still closer relations with ants. Most of them are very aberrant 

 as well as rare forms, and it has been several times observed in 

 North America that species of Cremastochilus not only live in 

 the nests of the ants, but are forcibly detained therein by the 

 owners, who clearly derive some kind of satisfaction from the 

 companionship of the beetles. The species of the genus Lomap- 

 tera stridulate in a peculiar manner, by rubbing the edges of the 

 hind femora over a striate area on the ventral segments. 



Series II. Adephaga or Caraboidea. 



All the tarsi Jive-jointed ; antennae filiform, or nearly so ; mouth- 

 parts highly developed, the outer lobe of the maxilla nearly 

 ahvays divided into a two-jointed palpus ; supports of the 

 labial palpi developed as joints of the palpi, and in some 

 cases approximate at their bases. Abdomen with the exposed 

 segments one more in number at the sides than along the 

 middle, the number being usually five along the middle, six 

 at each side. 



THIS extensive series includes the tiger-beetles, ground-beetles, 

 and true water -beetles ; it consists of six families, and forms 

 a natural assemblage. It is sometimes called Carnivora or 

 Filicornia. The exceptions to the characters we have mentioned 

 are but few. The supports of the labial palpi are frequently 

 covered by the mentum, and then the palpi appear three-jointed ; 

 but when the joint-like palpiger is not covered these palps appear 

 four-jointed. As a rule, approximation of these supports is indica- 

 tive of high development. In some of the lower forms the trophi 

 remain at a lower stage of development than is usual. This is 

 especially the case with the genus Amphizoa, which forms of 



