96 



'belonf^s to some genera intermediate between Mylothris and 

 Hehomoia, and he desribes and figures the insect as MyJotlmtes 

 Pluto. The remains of this insect are particularly intei'esting as 

 belono-ino' to an extinct genus whose nearest living representatives, 

 jiccording to Scudder, are to be looked for in the genera Mi/lothri$ 

 and Hehomoia, the former of which finds its highest development 

 in Africa, while the latter is confined to the Indo-Malayan and 

 Austro-Maylayan regions. 



The remains of tlic third and last species, Fontia Fi\'i/eri are 

 also described by Heer and Scudder. The genus is a modern one 

 whicli is well represented by existing species, especially in the Old 

 AVorld. 



Lower Miocene. 



From strata refei'able to the lower Molasse of Switzerland. 

 Dr. Heer enumerates thirty-three species of insects, viz. : — 



C'oleoptera 2(5 species. 



Nouroptora ... ... ... '2 ,, 



Hymenoptcra ... ... ... 1 ,, 



Diptera 1 ,, 



Hemiptera .. 3 ,, 



33 



The lignites called brown coal in Germany belong for the 

 most part to this period, and are often rich in insect remains. 



The lignites of Eott in Siebengeberge, near Bonn, are the 



best known. From these lignites about tMcntj-nine species o-l: 



insects had been recorded by the year IS-'JG, according to Bronn, 



Oerraar, and Giebel. These twenty-nine species were distributed 



amongst the undermentioned order as follows, viz :— 



C'oleoptera IS sjiecies. 



Hymenoptera ... ... ... 2 ,, 



Lepiiloptera ... ... ... 1 ,, 



Diptera ... ... ... ... 5 ,, 



Orthoptera ... ... ... 1 ,, 



Hemiptera ... ... ... - ,, 



2i) 



In 1859 Carl von Heyden desciil.)ed twent^'-one additional 



species from this locality, viz : — 



