Clamlus] CLAVICORNIA. 13 



segment of the abdomen is furnished with a brush of hairs, as above 

 mentioned. 



The genus Cyboceplialus is now rightly regarded as belonging to the 

 Clambina rather than to the Nitidulidse. 



ANTSOTOMINA, 



This tribe contains a considerable number of small genera, which are 

 distinguished by having the upper surface glabrous or almost glabrous 

 and the anterior coxal cavities closed behind ; the body is oval and 

 convex, and in some genera capable of being contracted into a ball ; the 

 antennae and tarsi are very variable, and afford good characters for the 

 separation of the genera ; of these about ten are represented in Europe, 

 nine of which occur in Britain ; some of the species are very rare, and 

 many are exceedingly difficult to determine; they are found in moist 

 fungi, under bark, by sweeping herbage at sundown, &c. 



I. Head with distinct antennal groove on its under-side ; 



thorax with the posterior angles rounded ; elytra not 



striated with the exception of a sutural stria which 



is sometimes absent ; tibia finely, spinose j tarsi 



dissimilar in the sexes. 



i. Club of antennas 3-jointed AGATHIDIUM, III. 



ii. Club of antennae 4-jointed AMPHICYLLIS, Er. 



iii. Club of antennae 5-jointed, 2nd joint small . . . LIODES, J5V. 



II. Head without or with indistinct* antennal grooves 



on under-side ; thorax with the posterior angles 

 right angles or obtuse, but not rounded ; elytra 

 more or less plainly striated; tibiae distinctly 

 spinose ; tarsi similar in the sexes. 

 i. Base of thorax margined ; posterior tarsi with less 

 than five joints. 



1. Anterior and intermediate tarsi 5-jointed, 

 posterior 4-jointed. 



A. Club of antennae apparently 4-jointed, the 

 second joint being scarcely visible or quite 



concealed ; mesosternum not carinate . . . CTETUSA, Er. 



B. Club of antenna) plainly 4-jointed, the second 

 joint being small but distinctly visible j meso- 

 sternum carinate ANISOTOMA, 111. 



2. Anterior tarsi 5-jointed, intermediate and pos- 

 terior tarsi 4-jointed j club of antennae 3-jointed. COLENIS, Er. 



3. Anterior tarsi 4 jointed, intermediate and pos- 



terior tarsi 3-joiuted j club of antennae 5- 



jointed, second joint small A&ARICOPHAGrs, Schmidt. 



ii. Base of thorax not margined ; all the tarsi 5- 

 jointed. 



1. Club of antenna 5 jointed, second joint small . HTDNOBITTS, Schmidt 



2. Club of antennaD 3-jointed TRIARTHRON, Schmtdl. 



* Horn mentions Cyrtusa as possessing antennal grooves ; Thomson and Reitter, on 

 the contrary, class it with the species having no antennal grooves. 



