402 INSECTA. 



The second joint of the antennae is short, and the third elongated. 

 The four posterior tibiae are arcuated in several males. 



CALOSOMA, Web. Fab. CALOSOMA, CALLISTHENES, Fisch. 



This genus is much less numerous than the preceding, but the 

 species extend from the North to the Equator. 



C. sycophanta; Carabus sycophanta, L.; Clairv., Entom. 

 Helv. II, xxi, A. From eight to ten lines in length; violet 

 black; elytra golden-green or brilliant cupreous, and finely 

 striated, each with three series of impressed and distant points. 



Its larva inhabits the nest of the processionary caterpillars, on 

 which it feeds, consuming several of them in the course of a 

 day; when filled to satiety, it loses all activity, and other larvae 

 of the same species attack and devour it. It is black, and 

 frequently found running about OIL the ground or trees, particu- 

 larly the oak *. 



The third and last division of the Grandipalpi presents an ensem- 

 ble of characters which clearly distinguishes it from the preceding 

 ones. Most of the species that compose it are winged. The ante- 

 rior tarsi of the males are always dilated. The labrum is entire. 

 .The exterior palpi are merely somewhat dilated or thicker at the 

 extremity, with the last joint in the form of a reversed and elongated 

 cone. The internal side of the mandibles presents no tooth worthy 

 of notice; that in the middle of the emargination of the mentum is 

 bifid. The middle of the superior margin of the ligula is elevated 

 into a point. On the internal side of the anterior tibiae of several 

 is a short emargination, or one of the two spurs is inserted higher 

 than the other, so that in this respect these Carabici are ambiguous, 

 and might be placed, as well as those of the ensuing section, directly 

 after the Patellimani f . They usually frequent wet places. Some 

 of them, such as Omophron, appear to connect this tribe with the 

 following one or the Aquatic Carnivora. 



Some, in which the body is flattened, or convex and suborbicular, 

 are provided with eyes of an ordinary size ; their antennae are linear, 

 and generally consist of elongated and almost cylindrical joints; the 

 external sides of the maxillae are bearded, and the two internal spines 

 of the two anterior tibiae on a level at their origin ; these tibiae merely 

 have a simple longitudinal canal. 



Sometimes the body is a flattened oblong oval, with a cordiform 

 and truncated thorax posteriorly narrowed. The scutellum is dis- 

 dilated. The three first joints of the anterior tarsi of the males are 

 dilated. 



* Add C. inquisitor, Fab.; Panz. Faun. Insect. Germ. LXXXI, 7; C. reticula- 

 tum, Fab.; Panz. Ib. 9; C. indagator, Fab. ; Clairv., Ent. Helv. II, xxi, B; C. 

 scrutator, Fab.; Leach, Zool. Miscell. XCIII; C. calidum, Fab.; Oliv., Col.III, 35, 

 IV, 45, and II, 21. The C. porculatum of Fabricius is a Helops. See Dej. Spec. 

 II, p. 190, et seq. Add the C. calidum, luxatum, Sayi and. scrutator. Count Dejean 

 is mistaken in supposing the calidum to be a common species. 



f The Pogonophori are closely allied to the Loricerse. 



