1895.] ON T±E ORTHOPTEBA OF THE SANDWICH ISLANDS. 89l 



under the impression that the variation observed was a sudden 

 appearance of a character not otherwise met with in Flat-fishes ; 

 but since the publication of the paper Professor W. C. Mcintosh 

 has informed me that flat-fishes of some species in the ordinary- 

 course of development, while swimming on edge, go through a stage 

 in which they are marked on both sides with a row of dorsal and 

 ventral spots placed just aa in my specimen. He has referred me 

 to his paper in Proc. Eoy. Inst. 1889, xii. p. 396, where examples 

 of such larval fishes are figured. I am further indebted to Prof. 

 Mcintosh for a specimen showing this condition, and similar 

 specimens were also shown to me by Mr. B. W. L. Holt. 



My case of variation is therefore an example of a persistence of 

 larval coloration, and not of the appearance of a new character. It 

 is consequently much less important than I imagined, though the 

 comment respecting the similarity and simultaneity of the variation 

 of the two borders still applies. 



4. On the Orthoptera of the Sandwich Islands. 

 By Herr Brunnbr v. "Wattenwyl \ 



[Eeeeived November 19, 1895.] 



The Orthopterological Fauna of the Sandwich Islands is little 

 known, so that all collections made in them ought to produce 

 novelties. Mr. Aug. de Bormans, in 1882, published descriptions 

 of 17 species. The collection made by Mr. E. C. L. Perkins with 

 much labour in 1894 contains examples of 23 species, which are 

 only in part identical with those of the first collection. 



If we combine the results of these two explorations, we must 

 confirm the conclusion already arrived at by Mr. de Bormans 

 that this fauna is distinguished by its poverty, and notably by 

 the absence of the Mantodea and Phasmodea. The Acridiodea are 

 represented by only a single species. 



With the exception of some cosmopolitan species, the fauna is 

 composed of species already known from the Australian Archi- 

 pelago and of autochthonous species that are allied to the others. 

 The genus Bmchymetopa, represented by three or four species, is 

 peculiar to the Hawaiian Archipelago. It is a member of the 

 group Oonocephdlini. 



In the family Gryllodea the two new species of Paratrigonidium 

 are remarkable. This genus, hitherto, has only been recorded from 

 Asia. 



A new genus, Prognathogryllus, consists of two anomalous forms. 



Finally we meet with two species which evidently are recent 

 importations. The first of these is O.vi/a velox, Fab., the unique 

 representative of the Acridiodea, which is very common in the 



^ Communicated by Dr. D. Sharp, P.Z.S., on behalf of the Committee for 

 investigating the Fauna of the Sandwich Islands. 



