A SUMMER TRIP. 73 



of land ; and Dr. Gunthcr has shown that almost every 

 mountain tarn in Scotland, Ireland, and the Orkneys has 

 its own peculiar species of trout or charr. Putting all 

 these things together, then, it seems' very probable that 

 the two Lundy beetles have really been developed on 

 the island itself from ancestral forms similar to those of 

 England, but specially selected under the particular 

 circumstances of the locality in which their lot was cast. 

 If all the outlying eyots of Kerry, Connemara, and the 

 Hebrides were equally well searched, it is extremely 

 likely that dozens more and similar cases of insular 

 species would be discovered without much difficulty. 



