THE COLEOPTERA OF MADEIRA 



253 



neous, but the facts themselves must be of value. The 

 outline map here given will show the relation of the 

 islands to the other Atlantic groups and to the adjacent 

 continents. 



I propose to confine myself mainly to evidence furnished 

 by the Coleoptera of the Madeiran group, because, being 



Fig. 51. — outlink^Imap "Of the azores. 



Note.— The light tint shows where the sea is less than 1,000 fathoms deep. 

 The dark tint ,, ,, ,, more than 1,000 fathoms deep. 



The figures show depths in fathoms. 



separated from the mainland by a much wider extent of 

 ocean than either the Canaries or Cape de Verdes, they 

 offer a much more satisfactory test of the opposing theo- 

 ries. It is an advantage also that the materials are by 

 far the most complete ; and in the Inseda Maderensia Mr. 

 Wollaston has given some details of importance which are 



