Royal Physical Society. 79 



Choleva) ; and Erichson only records two species found in Mark 

 Brandenburg as belonging to it, viz. angustatus and agilis. 



The characters of his second division are— 



" Mesosternum simple ; tarsi slender, and anterior tarsi and first 

 joint of middle tarsi dilated in the males. ,} 



These characters place the following species in this section, 

 viz. C. fuscus, umbrinus, picipes, nigricans, grandicollis, tristis, 

 nigrita, fuliginosus, morio, fumatus, and scitulus, of which gran- 

 dicollis, fuliginosus, and scitulus are given as new. Fuliginosus 

 is said by Kraatz to be a variety of nigricans (though, from the 

 description alone, I should not have supposed this), and scitulus, 

 as already mentioned, had been described by Spence under the 

 name of fumatus. Erichson does not record chrysomeloides as 

 found in Mark Brandenburg, but from the differences which he 

 points out between it and tristis, I am not sure but some con- 

 fusion exists even in Erichson relating to tristis. 



His next division is characterized thus : — 



" Mesosternum simple; body oval; antennae somewhat thickened at 

 the point ; tarsi slender ; anterior tarsi widened in the males ; 

 middle tarsi simple in both sexes." 

 Velox and prcecox (Spencers Wilkinii) are Erichson's only 

 species falling under this division. 



The last division has the 



(l Mesosternum keeled; tarsi strong; anterior tarsi in the males 

 very broad, widened in the middle in the females ; middle tarsi 

 of both sexes equal. 33 



The only species recorded by Erichson is sericeus (truncatus, 

 Illig. and Steph.). 



The above list is instructive both negatively and positively, 

 both for what it does and for what it does not contain. Erichson 

 was celebrated not only for his marvellous acumen in distin- 

 guishing species, but also for his success in collecting and 

 for the extent of his collection. Mark Brandenburg too may 

 be taken as fairly representing the rest of Northern Germany ; 

 and unless where the species are of a local character, we may 

 pretty safely assume that the same species which occur in Mark 

 Brandenburg will be found inthe rest of Northern Germany. These 

 premises should teach us to use great caution in admitting any new 

 species from that district not described by Erichson, as they lead to 

 the probable conclusion, first, that such new species might have 

 been already found in Mark Brandenburg; secondly, that Erichson 



m 



