98 



Coleoptera 20 species. 



Orthoptera ••• ^ >• 



Hymenoptera ^ " 



Neuroptera ' " 



Lepidoptera 



Diptera ^ " 



31 

 Amongst other deposits of brown coal in which fossil 

 insects have been detected, may be mentioned those of Von 

 Sieblos, St5schen, and Salzhausen, from which Dr. Hagen, Carl 

 von Heyden, and Lucas von Heyden describe about 34 species, 

 inchiding some gigantic Neuroptera. 



The total number of species obtained from the lignites of 

 trown coal amounted by the year 1863, according to Dr. Hagen, 



to 103. . 



Since that date 142 further species have been obtamed from 

 the same deposits, giving us up to the year 1870 a total of 24r» 

 species distributed amongst the undermentioned orders as follows:- 



Coleoptera 126 species. 



Orthoptera ■•• j'. " 



Neuroptera ^*' " 



Hymenoptera ^, " 



Lepidoptera '' " 



Hemiptera i^ " 



Diptera ^ " 



24.5 

 Durino- the last seven years numerous additions may have 

 been made 'to the list, but if they have, I have been unable to find 

 any record of them. 



To this period (Lower Miocene) are referred the fresh-water 

 formations of Auvergne in Central France. These formations 

 are in some places, according to Lyell, partly composed of that 

 remarkable form of limestone, called "indusial," from the cases or 

 Indusia- of the Caddis worms or larva, of Phryrjarm, great heapa 

 of which have been encrusted as they lay by carbonate of lime, 

 and formed into a hard travertin. These Caddis worms are 

 abundant at the bottom of fresh-water streams and lakes, and 

 many of the fresh water limestones of this locality are, accordmg 



