MUSEUM OF COMPARATIVE ZOOLOGY. 15 



ish fuscous. On the whole, therefore, they approach most nearly the Duncan 

 Island tj'pe. 



The single specimen from Jervis Island, a male, is almost an exact duplicate 

 of some of the similarly sized males from Albemarle Island, with faintlj 

 infumated wings. 



From this review, we may conclude that three or four distinct types are 

 becoming gradually differentiated on the eight islands from which they are 

 known. The Duncan Island type is the most clearly marked, and is ap- 

 proached the most closely by the Barrington Island form. The latter shows, 

 however, some closer points of resemblance to the Indefatigable Island type, 

 with which the Chatham Island specimen agrees perfectly, and the James Island 

 specimens nearly as well. The Albemarle Island type is another, with which 

 the Jervis Island specimen agrees completely and the Charles Island form is 

 not greatly removed from it. 



Without doubt, more satisfactory results could be reached from the study of 

 specimens which were properly preserved. All the specimens seen were killed 

 and long immersed in alcohol, changing the character of the coloring and mark- 

 ings to an unequal and distracting degree ; and as the sole differences (besides 

 mere size) which we have been able to trace among specimens from different 

 islands are drawn from the coloring and markings, it is much to be hoped that 

 collections will some day be made in large numbers from every island, and from 

 different points on Albemarle Island, killed in the cyanide bottle and preserved 

 without contact with alcohol. Meanwhile this may serve as a preliminary 

 study. 



Mr. A. Agassiz states that this species is found only inland on the higher 

 ground, while the next species is confined to the lower levels. Wolf made a 

 similar observation. 



Schistocerca literosa. 



Plate II. Figs. 1, 3 



Acridlum literosiim Walk., Cat. Derm. salt. Brit. Mus., IV. 620-621; V., Suppl.,G3; 



Riitl., Proc. Zoi)l. See. Lend., 1877, 88. 

 Schistocerca sp. Brun. !, Proc. U. S. Nat. Mus., XII. 193. 



The male of this species was described by Walker from the Galapagos 

 without mention of any island; but as the specimens described were col- 

 lected by Darwin, and Butler includes some of Darwin's collection in his 

 paper, Butler's specimens, two in number, which he credits to Charles Island 

 are probably Walker's types. Bruner's specimens, 1 male, 3 females, are from 

 Chatham Island. Tlie specimens reported on by Riley, 4 females, are also 

 from Chatham Island. Besides this Baur brought home 4 males, 2 females, 

 from Chatliam Island, G females from Hood Island, and 2 males from Tower 

 Island. It has tlierefore now been obtained from four different islands, from 



