COLEOPTERA. _ 495 



CasTtoma, Latr. (liavinj^ the thorax lonf;; and conical)j Leptotrac/ieliis, Latr., and Odacautha, Payk. (with the 

 thorax nearly cylindrical, the elytra trmicate, and the tarsal joints entire), are distin(i;uished by having the outer 

 maxillary palpi tiliform, or scarcely thickened at the tip. Od. metaiuwa, Fabr., Ciairville, is three lines long, of a 

 bluish green colour, \vith the elytra, except at the tip, of a reddish yellow ; the tip of tlie elytra is bluish black. 

 This species frequents aquatic places, and is commonly found in the departments of the north of France, Germany, 

 and Sweden. [It is plentiful in similar situations in the fens of Lincolnshire, Whittlesea Mere, &c., and is found 

 in {quantities in the sedge boats which go to Cambridge-] 



Tliose which have the outer niaxil!ai-y palpi terminated by an enlarged triangular or obconical jnint, and which 

 have the body flattened and the tarsal joints entire, compose the three following subgenera, namely, Ziijikium, 

 Latr., Polhlicln's, Bonelii (consisting of a single British sjjecies, P. futiclolalm), and llt'Huo, Bun. [the last of 

 ^vliich consists of numerous exotic species, the type being (L costatasoi New South Wales]; whilst those which 

 ditier tVom tlie last in having the penultimate joint of the tarsi deeply bilobed, the jaws long and porrected, and the 

 body thick, form the genus DryptOy Latr., Fabr., the type of which is the D. emarginata, Fabr., four lines long, of 

 a fine blue culour, with the mouth, antenna;, and leg& fulvous. It is more common on the south than the north 

 of France. i\L Blondel, however, found it abundantly near Versailles. [It is very rare in England, and has been 

 found on tiie southern coast.] 



Trichognaiha, Latr., Galeriln, Fabr., and Cordit:tcs, Latr., are exotic genera [chiefly American], differing from 

 the preceding in having the four basal joints of the anterior tarsi of the males greatly dilated, the fourth being 

 constantly bilobed in both sexes. 



The renraining Truncatipennes have the ungues of the tarsi linely toothed beneath, like a comb. 



Cfniodac/i/!ti, Dej., and At/ra, Fabr., have the head oval, and separated from the thorax by an abrupt neck ; the 

 fourth tarsal joint is always bilobed. The latter genus has the body very long and narrow, with the thorax of an 

 elongated conical form, narrowed in front. The species are numerous, and inhabitants of South America. 



The four following subgenera have the head not separated from the thorax by a distinct narrow knot or rotule ; 

 the body is flattened and elongated, and the thorax is longer than broad, heart-shaped, posteriorly truncated. 



Cjimindes, Latr. {Tarus, Clairv.), wdth the outer maxillary palpi filiform, the last joint cylindrical, but being in 

 the labial palpi very large and hatchet-shaped, at least in the males, and all the joints of the tarsi are enlire and 

 nearly cylindrical. [The type is the Carabiu, lutmcralis, Fabr., a rare British insect ; there are also several other 

 British species.] 



Calleida, Dej., having the fourth joint of the tarsi bifid. Peculiar to America. 



Demetrias, Bnn. Similar to the last in the tarsi, but with the palpi filiform, and the last joint nearly ovoid or 

 subcylindrical. This and the following subgenera consist of very small species [many of which are British], and 

 which for the most part frequent aquatic, moist, or shady places, and are nearly all natives of Europe. 



Drouiius, Bon. Generally apterous, with the tarsal joints entire, but in other respects agreeing with Demetrias. 



In the rest tiie thorax is broader than long, broadly truncate behind. 



Of these, Leijia, Latr. (and Lamprias, Bon.), have the middle of the posterior edge of the thorax prolonged into 

 a transverse lobe ; the four basal joints of the tarsi are nearly triangular, and the fourth is more or less bifid or 

 bilobed. These insects are agreeably diversified in their colours, [being in fact some of the most elegant of the 

 whole family. The type of Lebia is the Carabus crux minor, Lin., of a fulvous colour, with a black head, and an 

 irregular-shaped black cross on the back of the elytra. It is very rare in England.] The type of Lamprias, the 

 Carabus cijaiiocephahis, Lin., is about three lines long, of a sliining blue or green colour above, with the basal joint 

 of the antenna;, the thorax, and feet, reddish yellow, and the tips of the thighs black. It is a rather common 

 specius throughout Europe. Others have the thorax terminated in a straight hue, without an advanced lobe, 

 namely, Ptoe/»'0H!/s, Dej., Or^/iojioniia, Dej., and Coptodera, Dej., all consisting of e.xotic species; near the last 

 of wdiich ought probably to be arranged the subgenus Hexagonia, Kirby. 



[" The subfamily Truncatipennes [or the BracJiinidce of M'Leay] as at present constituted, is, per- 

 haps, the most incofigruous of all the subfamilies of the Carabidae, the term Truncatipennes, applied to 

 it liy Latreille, by no means iudicating a constant character, as many of the species liave the elytra 

 rounded at the tips. The tarsi are indeed generally alike in both sexes, or, if dilated in the males, 

 tlie dilatation is of a different character from that of the other subfamilies. It may indeed be rather 

 regarded as a convenient receptacle for such groups as liave tiot the bijiartite and palmated structure 

 of'tbe Scaiitides, the simple tiliia; of the Carabides, the dilated male tarsi of the Harpalides and its 

 subdivisions, or the minute conical terminal joint of the maxillary palpi of the Bembidiidcs." (Introrl. 

 to Mod. Class, of Insects, vol. i. p. 75.) The family has been greatly studied, and a vast number of 

 new species described, together v.-U]\ many new genera; but these have been established upon slight 

 structural cliaracters, and as they are for the most part exotic, I have not thought it advisable to 



detail tbem.] 



2. The second section, that of the Bipartiti, or the Scabitides, Dej., and which may from their 

 habits be also called Fossores or Burrowers, is formed of Carabici with the elytra entire or slightly 

 siniiated at the posterior extremity, the antennfe often necklace-like and elbowed [at the extretuity 

 of the long basal joint], the bead broad, the thorax large, ordinarily in the shape of a cup, or nearly 



