304 1NSECTA. 



Most of them frequent the shores of rivers, or other aquatic locali- 

 ties. 



We divide the Patellimani into those in which the head becomes 

 insensibly narrowed behind, or at base, and those where this contrac- 

 tion occurs suddenly behind the eyes in such a manner that the 

 head seems to be supported by a kind of neck or pedicle. 



The first also may be subdivided into two. 



Some, in which the mandibles always terminate in a point, and 

 the palette of whose tarsi is always narrow, elongated, and form- 

 ed by the three first joints, the second and third square, have the 

 labrum entire or nearly unemarginate, and one or two teeth in the 

 emargination of the mentum; the anterior extremity of the head has 

 no border. 



Here, as in the preceding ones, the under part of the palettes of the 

 tarsi present two longitudinal series of papillae or hairs, with an in- 

 termediate space, and not a compact and continuous brush. The 

 exterior palpi are always filiform and terminated by an almost cy- 

 lindrical or ovoido-cylindrical joint. 



Sometimes the body is strongly flattened. 



Dolichus, Bon. 



The Dolichi approach the last subgenera, and are removed from 

 all the others by the hooks of their tarsi, which are dentated beneath. 

 Their thorax is cordiform and truncated(l). 



Platynus, Bon. 



Similar to Dolichus in the form of the thorax, but the tarsial 

 crotchets are simple. 

 The wings are absent in some, or are imperfect(2). 



Agonum, Bon. 



Where the thorax is almost orbicular(3). 



Sometimes the body is of an ordinary thickness, the thorax being 

 always in the form of a truncated heart. 



(1) Carabus flavicornis, Fab.; Preysl., Bohem. Insect., I, iii, 6, and some other 

 species of the Cape of Good Hope. 



(2) Platynus complanatus, Bon.; Carabus angusticollis, Fab.; Panz. Faun. In- 

 sect. Germ., LXXIII, 9; Platynus blandus, Germ., Insect. Spec. Nov., I, p. 12; 

 Carabus scrobiculatus, Fab.; Harpalus livens, Gyll. 



American species; Plat, erythropus, Dej.; P. angustatus, Id. Species III, p. 

 9799. Am. Ed. 



(3) Harpalus viduus, Gyll.: Panz., lb., XXXVII, 18; Carabus marginatus, 

 Fab.; Panz., lb. XXX, 14; Cam*. 6-punctatus, Fab.; Panz. lb. XXX, 13, and 



