548 INSECTA. 



the former, from Soiitli America, having the body shorter, broader, and depressed, with the thorax transverse, the 

 abdomen nearly square, scarcely longer than broad, the feet robust, and the tarsi much dilated, form the genus — 



Acanthocinus, Megerle, of which we possess only three European species. 

 One (L. adilis, Fabr.) is remarkable for the male antenna being more than 

 four times the length of the body. 



Others of a similar form, with the antennae bearded or fasciculated, form 

 the subgenus Pogonocherus, of which there are several British species, 

 nearly all of which are remarkable for having the elytra obliquely truncate 

 at the tips. 



Tetraopes, is but slightly elongate, and has each eye entirely divided into 

 two parts by the tubercle, from whence arises the antenna. 



Monochainus, Dej., has the body narrow and long, the antennae exceed- 

 ingly long, a strong spine on each side of the thorax, middle tibis slightly 



Kig.^l'.-Acanthociims speculifer. l,ent. 



In Dejean's catalogue, if we except the apterous species, the other Lamue of Fabricius are retained under the 

 generic name Lamia, but Dahl has separated C. curcvUonokles and nehulosa, (French species), under the name of 

 Mesosa, which is nearer to Saperda, in having the thorax notspinedat the sides. 



Lamiaiextor, [a very rare British species], an inch long, and of a dull black colour, conducts to — 



Dorcadion, Dalm., composed of the species which have no wings, a group peculiar to Europe and the adjacent 

 parts of Asia, and of which the larva probably feeds upon the roots of vegetables. 



Parmena, Megerle, has been separated from the last from having the antenna longer than the body. 



The other Lamiariaa have the thorax not armed at the sides with tubercles or spines, but cylindrical, the body 

 always elongated, and nearly linear in many species. These compose the genus — 



Saperda, Fabricius. 



Gnoma, Fabr., restricted to some species from Java, New Holland, Sumatra, &c., resemble Lamia in the position 

 of the head and the parts of the mouth, but thethorax is as long as the abdomen, cylindrical, and more slender in 

 the middle ; the fore-legs are very long. C. lungicollis, Giraffa, &c. 



Adesmm, Dej., has the first and third joints of the antenna greatly elongated, exceeding more than one third of 

 the whole antenna. 



vl/jomcfj/na, Dej., has the body cylindric, antenna filiform, short, terminated in an acute point ; the third and 

 fourth joints very long, and the following very short. [Species proper to the East Indies and Isle of France.] 



Colobothea, Dej., has the antenna close together at the base, the body compressed, the elytra notched or trun- 

 cate at the tips, with the outer angle produced into a spine. This group is peculiar to South America, and to the 

 most eastern of the Islandsof the Asiatic Archipelago. 



Other Saperda, from Brazil, with the thorax as broad as or scarcely narrower than the elytra, have the 

 third and fourth joints of the antenna very elongated and dilated, and the elytra dilated behind. (Saperda amicta, 

 togafa, &c.) Many other Saperda with the body very long and narrow have the antenna 12-jointed, thus forming a 

 distinct group. (Saperda Cardui, &c.) 



Amongst the species considered by all Entomologists as true Saperda, may be mentioned Saperda carcharias, 

 Linn, [a British species lately discovered in the fens of Huntingdonshire and Cambridgeshire, in great quantities, 

 and which is figured in the Entomologists Text Book], the larva of which lives in the trunks of poplars, and some- 

 times destroys young plantations. 



Some species have the body still more narrow, and the antenna excessively long. 



The fourth and last tril)e, that of the Lepturetae, is distinguished by having the e\es rounded, entire, 

 or scarcely emarginate ; the antennre inserted more in front, or at the anterior extremity of the slight 

 emargination of the eyes ; the head is posteriorly prolonged behind the eyes in many, or suddenly nar- 

 rowed into a neck at its junction with the thorax, the latter being conical and narrowed in front. The 

 elytra gradually diminish in width to the tip. 



This tribe composes the genus 



Leptura, Linnaus, — 

 E.xcept such species as belong to the preceding tribes and to the Donacia. Thus modified, the genus corresponds 

 to Stenocorus, Geoffr., and to those of Rhagiiim and Leptura of Fabricius. In some species tlie head is elongated 

 immediately behind the eyes ; the antenna often shorter than the body, and close together at the base, inserted at 

 a distance from the eyes upon two small eminences like tubercles, and separated by an impressed line ; the 

 thorax is ordinarily tubercular, and spined at the sides. 



Desmocerus, Dej., has the palpi filiform, with the last joint of the maxillary nearly cylindrical ; the third and two 

 following joints of the antenna are dilated at the external angle, especially in the males. D. cyaneus. Fab. ; North 

 America. 



The following differ in having the palpi dilated at the extremity, and terminated by a conical joint ; the antenna 

 regular. 



Vesperus, Dej. [consisting of a few species from the south of Europe], differs in the males alone being winged ; 

 the thorax is conical, entire, and without spines or tubercles ; the elytra of the females [which sex is very broad 

 and convex], are short, and gaping at the tip. 



