HEMIPTERA 95 



viz. (3) Australo-polynesian and (4) recent accidental importations. The precinctive 

 forms owe their large number, however, very greatly to our poverty of knowledge, for 

 the study of exotic Rhynchota is almost in its infancy, and many of those now arranged 

 in the second group may at any time have to be removed to the third. 



In the first group may be placed Tctigonia, Bythoscopus. Oliarns, Triphleps, 

 LasJochilus, Psalhts, Orthoiyliis, Acantliia, Corixa, Anisops, Ploiariodcs (though the 

 typical subgenus is precinctive), Reduviolus, Microvclia, Orthoca, Nysins, and Rhopalus. 

 Geotonms has a remarkable distribution, practically cosmopolitan, and the Hawaiian 

 species, which has been described under eleven names, is found from India to New 

 Caledonia. It is of course now impossible in most cases to decide the actual recent 

 origin of these cosmopolitan forms ; though the genera are found all over the world, the 

 only cosmopolitan species is Klinophilos lectularius, doubtless accidentally introduced in 

 modern times. 



There are a large number, as previously noted, of precinctive genera and species ; 

 of the former perhaps the most remarkable are Metrarga, SnlaDiita, and Psciidoclerada ; 

 the first must be of considerable antiquity, as it has separated into at least three 

 structurally well-defined species, which are distributed over the Archipelago, though 

 they have not apparently penetrated to Molokai or Kauai. It occurs under rotten 

 leaves and other vegetable refuse, and as Mr Perkins has collected less than 25 

 specimens altogether, it is to be hoped that the remarkable genus will be found to 

 flourish in Viti or Samoa. Psciidoclerada possesses a most remarkable likeness to the 

 Geocorid Clcrada, a wide-spread insular genus which I regret I know only through 

 Signoret's figure. Itliainai-. though differing considerably in the proportions of the 

 antennae etc., has a very strong resemblance to the closely allied Daclera from Reunion 

 and Australia. 



The finest of the precinctive species is Colcoticluis Idackbnrniac, which indeed is 

 one of the handsomest Heteroptera I have seen, rivalling some of the exotic Cicindelidae. 

 None of the others require special mention here. 



The Australo-Polynesian forms embrace the following genera : Oechalia with two 

 species — viz. O. consociale Boisduval, which ranges over Eastern Australia and New 

 Zealand ; the second species, O. griseus Burm., is remarkably variable, including 

 O. pacijica and O. patrjielis Stal, and is confined to the Hawaiian Archipelago. Colco- 

 ticluis has its headquarters in the Australo-Polynesian, eight species being recorded from 

 Australia, New Caledonia, V'iti Isles, Samoa and our group ; two outliers are also iound, 

 one from Formosa and one from the Moluccas. Liitcva has a wide distribution but is 

 perhaps most conspicuous in the Australian region ; it e.xtends however to America 

 (via the Pacific .■*), the Oriental Isles via New Britain, etc. Of Australo-Polynesian 

 species we may note Orthoea nigriccps, which extends to Tahiti and the Philippines ; 

 it has been recorded, possibly erroneously, from New Zealand. Hyalopepliis has, as at 

 present known, its headquarters in the South Oriental, but as a well-defined species 



F. H. Ill, 13 



