198 INSECTS OF THE GALAPAGOS. [CH. IV 



species in one island and one in another. Thus Mimus 

 parvulus is only met with in Albemarle Island and Mimus 

 trifasciatus only in Charles Island. 



The insects of these islands are not very numerous. 

 Mr Wallace following Mr Waterhouse allows about 

 35 species of Beetles, belonging to 2.9 genera. The 

 species are as a rule peculiar and so are the genera in 

 some cases. But as they are " mostly small and obscure 

 insects," it is difficult to be positive upon either of these 

 points. 



The Orthoptera of the Galapagos are equally interest- 

 ing. Considering that nine different expeditions have been 

 made to these islands, from which insects of this group 

 have been brought back to Europe or America, and 

 reported upon, it may be fairly assumed that our know- 

 ledge of the fauna is not too incomplete to permit of 

 conclusions. There are in all 20 species, of which Dr 

 Scudder, the latest writer on the subject 1 , leaves with 

 justice five out of consideration, as they are world- wide 

 forms and probably not endemic. The remaining 15 

 include five distinct generic types ; but the whole assem- 

 blage presents, according to Dr Scudder, a South and 

 Central American facies. Another matter worthy of 

 mention is the very great prevalence of apterous or 

 sub-apterous species. The 20 species are in many cases 

 confined to one of the islands of the Galapagian archi- 

 pelago. This is so with no less than eleven of them. A 

 few are found in two or three of the islands ; one species 

 Schistocerca melanocerca is unique for its wide dis- 



1 Bull. Mus. Comp. Zool. Harvard, 1894. 



