COLEOPTERA. 
519 
In all the following subgenera, the antennae or their clubs are lodged in lateral cavities on the under-side of the 
thorax. The prosternum is always dilated like a cravat. 
Attagenus, Latr., has the club of the antennae very large, lax, and three-jointed, and the body short and slightly 
convex, Dermestes Serra, Fab. 
Trogoderma, Latr., has the club of the antennae lax, 4-jointed, and the body oblong. Antlirenus elongatus, Fab. 
Anthrenus, Geoff., has the antennae 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. Bgrrhus verbasci, 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 tibise 
folding upon the femora, and the tarsi upon the tibiae, so that when these limbs are thus contracted 
and closely applied to the body, the animal seems absolutely destitute of feet and lifeless ; the tibiae are 
ordinarily broad and compressed, the body is short and convex. This tribe is composed of the genus 
Byrrhus, Linn. 
Nosodendron, 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. 
Byrrhus 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. 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. striato-punctatus, Dej. [This is the genus O. 
omorpJms, Curtis.] 
Another small and very hairy species has the club of the antennae 3-jointed, {Trinodes 
Mrtus, Cuv.) 
Others have the club of the antennae only 2-jointed, the last large and nearly globular. 
{B. ermaceus, Zeigl., B. setiger, Illig.) [These form the genus Synealypta, Dillw.] All the 
Fi?. 66.— Byrrhus piluia. 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 Clavicornes, although very natural, is only to be distinguished by a reunion 
of several charaeters. Some differ from the other Clavicornes in having only nine or six joints in the 
antennae, in this respeet approaching the next family. The antennae of others are 11- or 10-jointed, 
but sometimes they are 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 prosternum dilated in front and the '' 
feet imperfeetly contraetile. They are found in water or under stones at its edge, often buried in the 
earth : some in the form of the antennae approach the Gyrini. 
I divide this section into two tribes. 
The first tribe, Acanthopoda, is distinguished by its flattened feet, which are broad, and armed on the 
outside with spines, the tarsi short and 4-jointed, with ordinary sized claws, and the body depressed ; 
the prosternum is dilated; the antennae are rather longer than the head, curved, 11-jointed, the last 
six forming a nearly cylindrical serrated mass. This tribe is composed of a single genus. 
Heterocerus, Bose. 
These insects are found in the ground at the edge of water, rushing from their retreats when the earth is shaken 
by the feet ; the form of their feet allows them to dig in the ground, where they conceal themselves, the tarsi folding 
back. It is here where the larvae also reside, as first observed by M. Miger. 
H. emarginatus, Fab., is a small (common) insect, of a silky black colour, with paler butf variable markings ; 
Gyllenhall has observed that the tarsi are in reality 5-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 body is thick and convex ; the thorax less rounded, and often with acute pos- 
terior angles. The chief type of this tribe is the genus 
Dryops, Oliv. (Farms, Fabr.), 
Which is divisible as follows : — 
