COLEOPTERA. 



541 



Our second general division of the genus Curculio of Fabricius differs in the narrowness of the mentum, which, 

 from not occupying the whole breadth of the oral cavity, leaves the sides of the maxillae and mandibles (which 

 are toothed) exposed ; the club of the antennae is formed of five or six joints. 



Those with only two teeth in the mandibles, and the labial palpi distinct, and which are destitute of wings, com- 

 pose the sub-genera Myniops, Rhytirrhhms (which have simple tarsi), and Liparus (which has pulvillose tarsi). 

 Those which have wings form the sub-genera Hypera and Hylobius. Those with three or four teeth in the mandi- 

 bles, and the labial palpi nearly obsolete, form the subgenus Cleonm, including various other genera of Schonherr. 



The Longirostres, or those with the antennae inserted at a distance from the insertion of the man- 

 dibles, often near the middle of the rostrum, which is generally long, nearly correspond to the genera 

 Lijrtis, RlujnchcBnus, and Calatidra, Fabr. In the first two the antennae are at least 10-jointed, butoftener 

 11-or 12-jointed ; the club being at least composed of the last three joints. 



Lixus, Fabr.— 

 Nearly resembles Cleonus in the trophi, the long fusiform club of the antennee, the narrow elongated form of the 

 body, and the armature of the feet. It is nearly linear in L. paraplecticus [a common British species], the larvae of 

 which live in the stems of Phellandrium, and produce in horses which may happen to eat them [with the plant], 

 the disease called " parapl^gie." 



lihhioey/lus, is composed of a species with the antenna; scarcely elbowed, and which, from its supposed efficacy 

 in the toothache, [has been specifically named R. anti-odontalgicus\. 



Rhynch^nus, Fabr. — 

 Has not such general characters. In some the sternum has not a cavity for the reception of the rostrum ; and of 

 these some have the antenna; 11- or r2-jointed, and the legs not fitted for leaping. 



Thamnophilus, is winged, the antenna short and scarcely elbowed, and the tibiae armed with a strong hook at the 

 tip. 



Bagons, has the tibia curved, with a strong hook at the tip ; the tarsi long and filiform. These are small insects, 

 found in marshy places. 



Brachypus, differs from the last in having the penulti- 

 mate joint of the tarsi very much dilated ; the last joint 

 sometimes without claws. 



Balaninus, has the rostrum very long, sometimes longer 

 than the whole body. B. nucum [the common Nut Weevil], 

 the larva of which feeds on the kernel of the nut. 



RhynchiEnus, differs from the preceding by negative cha- 

 racters ; and from the following by having 12-jointed an- 

 tennae, 



Sibynia, having only lljointed antennae ; the club com- 

 posed of seven. 



Myorhimis, differs in having no wings. Many of Schon- 

 herr's genera are here united together. 



We now pass to those which have only nine or ten joints 

 in the antennae, and are able to leap. 



Cionus, Clairv., has the body nearly globular, but they do 

 not leap. The following are able to leap, having thick hind 

 thighs. 



Orchestes, has the antennae fixed upon the rostrum. [Many minute British species.] 

 Ramphun, has the antennae fixed between the eyes. 



In the remaining Rhynchaeni the legs are apart at the base, and the sternum has a cavity for the reception of the 

 rostrum. 

 In Amerhinus and Bariduts, the latter is however wanting. 



Those which possess this cavity have been distributed into a very great number of genera by Schonherr. 

 Camptorhynchus (Eurhiniis, Sch.), differs in having the terminal part of the antennae forming a thick perfoliated 

 mass. 

 Centrinus, has the scutellum distinct, the club of the antennae elongated, and the prosternum with two spines. 

 Zygops, has the eyes united above, and the legs very long. 

 Cetitorhynchits, has the scutellum scarcely visible, the antennae 12-jointed. 

 Hydaticus, has II -jointed antennae. 



Orobites, has the body very short and sub-globose, the antennae 12-jointed. 



Cryptorhynchiis, has the body oblong-convex ; the fore-legs longest, especially in the males ; antennae 12-jointed. 

 Tylodes, is apterous or sub-apterous, with the scutellum wanting. 



Calandra, Fab.— 

 Comprises the terminal longirostres which have only nine joints to the antennae, the last, or the two last, forming 

 the club, with the tip spongy. They feed in the larva state on seeds or woody substances. 



Anchonus, Sch. (with 10-jointed antenn.T), and 



OrthochiCtes, Germ, (with 9-jointed antennae), are both apterous. 



by the introduction i 

 the nut; e, exit hole 

 c, the pupa of the i,hn 



I, the perfi 



