COLEOPTERA. 519 



In all tlie following subgenera, the antenna? or their clubs are lodged in lateral cavities on the under-side of the 

 tliorax. The presternum is always dilated like a cravat. 



Attagenui, Latr., has the club of the antennae very large, lax, and three-jointed, and the body short and slightly 

 convex, Vermettes Serra, Fab. 



Trogoderma, Latr., has the club of the antennae lax, 4-jointed, and the body oblong. Anthrentu elongatus, Fab. 



Anthrenus, Geoff., has the antennas terminated in a solid obconical mass, lodged in short cavities beneath the 

 fore angles of the thorax. The species of this genus are very small, living upon flowers in the perfect state, but 

 feeding in the larva state on dried animal matters, especially preserved collections of insects. These larvae are 

 oval, clothed with hairs, which are sometimes denticulated, forming brushes, the posterior ones being elongated 

 behind like a tail. The last skin of the larvae serves as a cocoon for the pupa. Byrrkiu verbatei, Linn. 



Globicornis, Latr., has the antennae terminated by a solid globular mass. Megatoma rufitarsis, Latr. 



The eighth tribe, Birrhii, differs from the preceding in having the feet entirely contractile, the tibiae 

 folding upon the femora, and the tarsi upon the tibi:e, so that when these limbs are thus contracted 

 and closely applied to the body, the animal seems absolutely destitute of feet and lifeless; the tibia; are 

 ordinarily broad and compressed, the body is short and convex. This tribe is composed of the genus 



Bybrhus, Linn. 

 Xosodendron, Latr., differs from the rest in having the mentum entirely exposed, wide, large, and shield-like, the 

 antennae suddenly terminated in a short 3-jointed mass. The species are found under the bark of trees. 



ByrrAtu proper, differs in having the mentum of the ordinary size. In some the antennae increase gradually, or 

 terminate in an elongated 5 or 6-jointed mass. B. pilida, Linn., three or four lines long, black beneath, bronzy 

 black and silky above, with small black spots separated by paler coloured lines ; [a very common species, found in 

 the earth, and in sand-pits, &c] 



A species with similar antennae differs in having the fourth joint of the tarsus minute, and 

 hidden between the lobes of the third. B. ttriato-punctattu, Dej. [This is the genus 0. 

 omorpkus, Curtis.] 



Another small and very hairy species has the club of the antennae 3-jointed, (Trinodes 

 hirtus, Cuv.) 



Others have the club of the antennae only 2-jointed, the last large and nearly globular. 

 (7?. erinaceus, Zeigl., li. tetiger, Illig) [These form the genus Syncalypta, Dillw.] All the 

 Fie. C8.— Bjrrhna pilula. Byrrhii are generally found in the ground and in sandy places. Murmidius belongs, 

 according to Dr. Leach, to this family, but the antennae are only 10-jointed, the last forming a club. 



Our second section of the Clavicorncs, although very natural, is only to be distinguished by a reunion 

 of several characters. Some differ from the other Clavicorncs in having only nine or six joints in the 

 antenna;, in this respect approaching the next family. The antennae of others are 11- or 10-jointed, 

 but sometimes they an: not longer than the head, forming after the third joint a sub-cylindrical, serrated 

 mass : sometimes they are filiform, and as long as the head and thorax, but here the tarsi are terminated 

 by a large joint with two strong hooks. Those of Heterocerus and Georyssus are only 4-jointed. 



The body is generally ovoid, with the head immersed up to the eyes in a trapezoidal corselet, with 

 the sides elevated, and terminated behind in acute angles; the presternum dilated in front and the 

 feet imperfectly contractile. They are found in water or under stones at its edge, often buried in the 

 eafth : some in the form of the. antenna; approach the Gyrini. 



I divide this section into two tribes. 



The first tribe, Acanthopoda, is distinguished by its flattened feet, which are broad, raid armed on the 

 outside with spines, the tarsi short and 4-jointed, with ordinary sized claws, and the body depressed ; 

 the presternum is dilated; the antenna; are rather longer than the head, curved, 1 1 -jointed, the last 

 six forming a nearly cylindrical serrated mass. This tribe is composed of a singli 



Hetbrocercs, Hose. 



These insects are found in the ground at tin' edge of water, rushing from their retreats when the earth i- sha 

 by the feet ; the form of their feet allows them to dig in the ground, where they conceal themselves, the tarsi fol 

 back, it is here where the larvae also reside, as first observed by M. Miger. 



//. emarginatus, Fab., is a small (common) insect, of a silky black colour, with paler buff variable markinj ; 

 Gyllenhall has observed that the tarsi are in reality S-jointed, the basal joint being minute. 



The second tribe, Macrodactyla, comprises such Clavicornes as have the tibiae simple, narrowed, with 

 long tarsi composed of five joints [except in Georyssus), the last joint being large, with two strong 

 ungues at the tip; the bodj is thick and convex; the thorax less rounded, and often with acute pos- 

 terior angles. The chief type of tins tribe is the genus 



Dhyops, Oliv. (Parmu, Fabr.), 

 Which is divisible as follows ■. — 



