2 FAUNA HAWAIIENSIS 



appear to be in the process of becoming differentiated into other distinct species. All 

 the other species are well-known foreign forms, and in the islands they are generally 

 found in the neighbourhood of settlements, and often within the houses themselves, 

 although some have now spread widely over the lowlands and the lower slopes of the 

 mountains. 



Thus of the 24 species representing the four primary divisions of the Order thus far 

 considered, one only has any claim to be considered indigenous, the rest, with the 

 exception of two or three species, which may possibly be natural immigrants, having 

 certainly been imported by man. 



In striking contrast with these are the remaining two divisions of the Order, viz. 

 the Locustodea and Gryllodea. 



The Locustodea are represented by 13 species distributed in 4 genera. Two of 

 these genera, each with a single species, are foreign, and both are certainly recent 

 importations. The Elimaea has now spread throughout the group, over the lowlands, 

 but the XipJiidiwn so far has been found only in Honolulu and the immediate 

 neighbourhood, and its introduction is probably of very recent date. The other two 

 genera, one with a single species, the other with ten, are peculiar to the islands, 

 and they are evidently allied to one another, and the more highly peculiar Brachy- 

 metopa with its 10 species may well have developed from some such form as the genus 

 Conocephaloides. 



The Gryllodea are of great interest, and are the most important and extensive 

 section of the Hawaiian Orthoptera. Ten genera are known, and these include 36 

 species. Four of the latter may be at once set aside, as being of foreign origin, and 

 each of these four represents a different genus. The three species Gryllus innotabilis, 

 Gryllodes poeyi, and Gryllotalpa africana are all well-known elsewhere, and a Myrme- 

 cophila, although now described as new, is certainly a recent importation, since it lives 

 only in the nests of foreign ants, and has been found only in the city of Honolulu. The 

 remaining 32 species are all peculiar to the islands, and are equally distributed between 

 two divisions of the Gryllodea. The 16 species of the Trigonidiides are all referable to 

 the genus Paratrigonidiuni, and no doubt others of this genus yet remain to be dis- 

 covered on some of the islands. Elsewhere the genus is known from Asia. The 

 other 16 indigenous species of Gryllodea are distributed in 5 allied genera, which are 

 themselves also peculiar to the islands, and are so highly remarkable as to warrant the 

 formation of a separate group for their reception. Three of the genera are represented 

 by only a single species, but there is hope that others may yet be discovered, since 

 neither genus has yet been found on more than one of the several islands. Of the 

 other two genera, PrognatJiogryllus contains five, and Leptogryllus 8 species ; the former 

 has occurred on Kauai and Oahu only, while the latter is widely distributed, Kauai 

 and Hawaii, at either end of the chain of forest-bearing islands, each having more than 

 one species. 



