220 LONOICOBNIA. [Crramlyriilir. 



I. Clypcus shorter; nn'crior COXOD subglobose, not or only slightly 



prominent; eyes nearly always strongly einnrgiuate CBBAMBYCIUA. 



II. Clypeus longer, often subqimdrate; anterior coxa) conical, 

 strongly promiiu-nt ; eyes almost entire or feebly emargioate 

 (iu our genera) LKPTCRINA. 



CERAMBYCINA. 



This family is represented in Europe by thirty-eight genera and about 

 one hundred and thirty species; only eight genera and fourteen species 

 are found in Britain; the formation of the clypeus and the anterior coxse 

 s "in to be the chief characters which distinguish them from the suc- 

 ceeding tribe; our genera may be separated as follows: 



I. Thorax with strong lateral spines AEOMIA, Serv. 



11. Thorax without lateral spines. 



i. Anterior coxal cavities open behind. 



1. Antennae inserted just above base of mandibles ; femora 



not or scarcely clavate; form stout and robust . . . ASEMUM, EtcJt. 



2. Antenna} inserted at some distance from biise of man- 

 dibles; femora more or less distinctly and strongly 



clavate, and often strongly petiolate. 



A. Anterior coxae widely separated HTLOTRUPES, Serv. 



B. Anterior coxae contiguous or almost contiguous. 



a. Third joint of antenna) evidently longer than 

 fourth ; thorax scarcely, if at all, longer thau 



broad ; size larger, 

 a*. Anterior coxal cavities rounded, not angulated 



external y CALLIDIUM, F. 



b*. Anterior coxal cavities transverse, very strongly 



angulated externally CIATUS, Laich. 



b. Third joint of antenna) almost shorter than fourth ; 

 thorax plainly longer than broad, subcyiiudrical ; 



size very small GKACILIA, Serv. 



ii. Anterior coxul cavities closed behind. 



1. Abdomen with the first segment elongate ; elytra 



covering abdomen OBHIUM, Lair. 



2. Abdomen with the first segment not elongate ; elytra 



abbreviated MOLOBCHUS, F. 



AROIVIIA, Serville. 



This genus contains one species, which is widely distributed in Europe, 

 and is not uncommon on willows in various parts of Britain; it is remark- 

 able for the strong-scented odour which it emits, on account of which it 

 is called the "musk beetle;" this name, however, is erroneous, as the 

 fragrance is much sharper and pleasanter than musk, to which, in fact, 

 it bears very little resemblance ; it is the only member of the sweet 

 scent-emitting group that is found in Britain; the allied genus Calli- 

 chroma contains a large number of exotic species, in some of which the 

 odour is very strorg; it is apparently more or less of a sexual character, 

 and exercises a mutually attractive power, as it is present in both sexes, 

 although it is believed, as a rule, to be more powerful in the female. 



