564f PHILOSOPHY OF ZOOLOGY. 



The genera are, Zephium, Galerita, Drypta, Agra, and 

 Odacantha. 



3. The palpi and tibiae present the same characters as the 

 preceding. The elytra are not truncated ; the suture of 

 the mentum obsolete. This includes the genus Siagona. 



4. The genera of this section differ from the preceding 

 ones, in the tibiae being denticulated externally. The 

 second and third joints of the antennae are nearly equal and 

 moniliform ; the elytra are entire, and the mentum articu- 

 lated. This includes the genera Scarites and Clivina. 



5. The elytra are entire ; the mentum articulated ; an- 

 terior tibiae entire externally, with short terminal spines; 

 labium pointed in the middle, with lateral lobes. This sec- 

 tion contains the genera Ozena, Morio, Aristus, Harpalus, 

 Feronia, Licinus, Badister, and Panagaeus. 



6. The elytra are entire, and the anterior tibiae very 

 slightly, or not at all notched ; labium pointed. This in- 

 cludes Cychrus, Pamborus, Calosoma, Carabus, Nebria, 

 Omophron, Pogonophorus, Loricera, and Elaphrus. 



7. In this last section, two at least of the exterior palpi 

 are pointed at the extremity. The anterior tibiae are 

 notched. Bembidion, Trechus, and Apolomus. 



2. Carnivora Aquatica. — The feet of the insects here 

 referred to are formed for swimming. The mid and hind 

 legs are compressed or ciliated ; the mandibules are con- 

 cealed ; the terminal hook of the maxilla? bent from the 

 base ; the thorax is broad. They live in the water both in 

 the larva and imago state The larvae are long and nar- 

 row, with twelve rings ; the head large, with strong, hook- 

 ed mandibulae, pierced at the apex. Tlie body has six 

 feet. 



1. Dyticida. The antennae are fiUform, and longer than 

 the head. In the males of many species, the three first 

 joints of the tarsi of the mid and fore legs are dilated, and 



