2 BULLETIN OF THE 



observation. In 1888 the naturalists of the U.S. Fish Commissiou 

 steamer " Albatross " obtained considerable collections on Chatham, 

 Charles, Albemarle, Indefatigable, James, and Duncan Islands, which 

 were reported on briefly by Bruner, who specified ten species and indi- 

 cated five others. The " Albatross " again visited the islands early in 

 18U1, and collections were made by A. Agassiz on Chatham, Charles, 

 and Duncan Islands, which form the subject of a short unpublished notice 

 by Riley. Finally, later in 1891, Baur made a special trip to the Galapa- 

 gos for collecting animals and plants upon the land, under the auspices 

 of Clark University, and brought back Orthoptera from Chatham, Hood, 

 Gardner, Charles, Albemarle, Barringtou, Indcfotigable, Duncan, Jervis, 

 and Tower. 



All the specimens collected on these several explorations, except those 

 of Mr. Darwin, Commander Cookson, and the frigate "Eugenie," and 

 including specimens of all but one of the species reported as obtained 

 by them, have been studied by me, and form the subject of the present 

 paper. I owe the opportunity of studying them to the lil)erality of the 

 U. S. National Museum, the Museum of Comparative Zoology, Clark 

 University, and Dr. Baur. 



They come from eleven different islands of the group, but mostly 

 from Charles, Chatham, Albemarle, and Indefatigable. There are but 

 twenty species of Orthoptera, twelve of which are found on Charles 

 Island, eleven on Chatham Island, four each on Albemarle, James, and 

 Indefatigable, while only a single one is known from each of the others. 

 Only nine of the species are known from more than one island, though 

 one is known from eight different islands. Excepting the cockroaches, 

 five in number and cosmopolitan forms, only two are credited with occur- 

 rence elsewhere (on the west coast of South America), and these cases 

 perhaps require reinvestigation. The fiict that the cockroaches are cos- 

 mopolitan forms and have been brought only from the two islands 

 (Charles and Chatham) which have or have had settled inhabitants, 

 suIHciently shows that they have been introduced commercially. That 

 these same islands have been more frequently visited by naturalists — 

 Charles Island probably by all of them — is ample explanation for 

 the larger number of species other than cockroaches known from them. 

 The followiuij; table shows the distribution of the different forms : — 



