2 28 FAUNA HAWAIIENSIS 



(14) Mesothriscus altci-naiis, sp. nov. 



Minor, nigro-piceus, nitidus, antennis palpis pedibusque testaceis ; minus depressus, 

 prothorace angusto, angulis posterioribus obtusis ; elytris parum elongatis, sulcatis, inter- 

 stitiis alternis magis elevatis, apicibus fortiter sinuatis. Long. corp. 5 — 6 mm. 



This is one of tiie species with the peculiar sculpture of the elytra that occurs in 

 so many of the Kauai Carabidae of different genera ; the true striae having disappeared, 

 while in their place are grooves with the interstices more or less angularly elevated, the 

 alternate interstices being more elevated than the others. The thorax is not transverse, 

 and is always long and narrow, though it varies somewhat in form. The apices of the 

 elytra are unusually strongly sinuate. The legs are rather short. The setae on the 

 last ventral of the female are two in number on each side in most, if not all, of the 

 specimens examined. 



A large series. 



Hab. Kauai (Perkins). Koholuamano, 4000 ft., in April, mts. Waimea, 4000 ft. 

 in May. 



Nos. 1220, 1242, 1243, Prof. Thaxter for Laboulbeniaceae. 



Platynus Bonelli. 



This genus, as at present understood, comprises numerous species and has a very 

 wide distribution. It is, however, a very composite one, and will no doubt be divided. 

 The two species I place in it agree fairly well with the apterous forms of Platynus 

 found in California. They are distinguished from the other Hawaiian Anchomenides 

 by possessing two setae on each side of the thorax as is normal in Anchomenides. It 

 is very remarkable that there are in the islands these two normal forms, while all the 

 others are unusual in possessing a diminished number of thoracic setae, the majority of 

 species in the islands being highly peculiar on account of the total absence ot these 

 setae. Both species are extremely rare. 



( I ) Platynus ainhicns, sp. nov. 



Depressus, fuscus, subtus nigricans, elytrorum epipleuris fusco-testaceis ; prothorace 

 elytris multo angustiore, basin versus angustato, angulis posterioribus leniter obtusis ; 

 elytris profunde striatis, apicibus oblique subtruncatis, parum sinuatis. Long, 

 corp. 7 mm. 



We have received only one specimen of this species; though at first sight very 

 similar to Atelothrus platynoides, it is very distinct therefrom. The lateral margin of 

 the thorax is very fine, and the sides behind are very slightly sinuate, the angles being 

 sharply marked, though distinctly obtuse. The elytra are broader behind, with the 



