Mr. G. R. Waterhouse's Description, &;c. 207 



XXXI. — Description of a Sub- Genus of Coleopterous Insects, 

 closely allied to the Genus Carabus. Bt/ G. R. Water- 

 house, Esq., Curator to the Museum and Assistant 

 Secretary for the Scientific Department of the Zoological 

 Society. 



[Read June, 1840.] 



A MOST interesting carabideous insect from St. Helena having 

 been placed in my hands by the Rev. F. W. Hope for the purpose 

 of publication, I beg leave, by his desire, to exhibit it to the 

 Members present, to point out its characters, and at the same 

 time to apply to it as a specific name that of its discoverer — the 

 celebrated African traveller — Mr. Burchell, 



The principal characters of this insect may be thus expressed : — 



Family CARABID^. 



Genus Carabus. 



Sub-Genus Aplothorax.* 



Caput satis grande. 



Antennce longoe, et crassiusculee. 



Mandibulce breviusculae, robustae, ad basin subbidentatae, 



Labrum angustum, transversale, antice emarginatum. 



Mentum profunde emarginatum, et dente centrali armatum. 



Thorax parviusculus, absque marginibus reflexis, vel foveis, postice 



angustatus. 

 Elytra oblongo-ovata, subdepressa, ad apicem rotundata. 

 Pedes perlongi — femoribus crassiusculis. 



This insect is very nearly equal in size to the Procrustes coriaceus, 

 and in its general form approaches that group of Carabi of which 

 C. depressus may be regarded as the type. In the general struc- 

 ture of the mouth, the great length of its tarsi, the sculpturing of 

 the elytra, and in possessing simple notchless anterior tibiae, it 

 agrees with the true Carabi, but it differs from Carabus proper in 

 the simple structure of its thorax, which is smooth and convex 

 and has no reflected margins nor fovcce in the posterior angles ; 



* This name has reference to the simple form of the thorax. 

 Q 2 



