150 MODERN CLASSIFICATION OF INSECTS. 



ments are semitransparent, so as to show the motion of the base of the 

 legs from above. When disturbed, it shghtly elevates the extremity 

 of the body, which is terminated by two short but rigid incurved 

 hooks. 



In a memoir upon the affinities of the genus Clinidium of Kirby, 

 inserted in the Zool. Journ., I have reviewed the characters of, and 

 illustrated with numerous figures the genera introduced into, this 

 family, which may be considered as allied, not only to the Trogosi- 

 tides, but also to the Paussidae and Cerambycidae. 



The British genera evidently require subdivision. There are seve- 

 ral remarkable exotic genera, which appear most naturally to be allied 

 to the present group of insects, although it must be admitted that 

 their characters are so anomalous that it is very difficult to trace their 

 affinities. Such are the genera Passandra Dalm. and Catogenus, 

 Westw. Zool. Journ. (Isonotus Perty'i Cucujus rufus Fabi'.), in which 

 the underside of the head is produced on each side, so as completely 

 to enclose the sides of the mouth. The genera Clinidium and Rhy- 

 sodes also appear to be most nearly allied to these insects, although 

 they are in some degree allied both to Parandra and Brentus. Calo- 

 dromus, also, a most anomalous genus from Malabar {Jig. 12. 20. C. 

 Mellii Guer.), having the posterior tibiae very minute, and the basal 

 joint of the posterior tarsi as long as the entire body, also appears to 

 be most naturally allied to the present group ; as does also the 

 Brazilian genus Hypocephalus*, which has so strong an analogy with 

 Gryllotalpa. Both these curious insects are figured in Guerin's 

 Magasin de Zoologie. 



The fifth family PAUSSiD^f,althoughof very small extent, comprises 

 some of the most remarkable forms amongst the Coleoptera. The 



* Dr. Gistl has recently published another figure and description of this extra- 

 ordinary insect, under the name of Mesoclastus paradoxus (^Faunus, No. 2.). 



f BiBLioGR. Refer, to the Paussid^b. 



Limiaus, Bigffi Insect. Upsal, 1775. 

 Afzelius, in Trans. Linn. Soc. vol. iv. 

 Donovan. Insects of India and New Holland. 

 Schonherr. Synonymia Insect, vol. i. part S. 

 Thunherg, in Act. Holm. 1781. 



