2 26 FAUNA HAWAIIENSIS 



from a species of Metrovieiuts, though the reverse case (in which the setae disappear) 

 possibly happens as a rare phenomenon. 



Only one specimen has been found : it is a female, and has three setae on each side 

 of the last ventral segment. Prof Thaxter took specimens of Laboulbeniaceae from it 

 with the number 1240 (?46). 



Hab. Molokai (Perkins). Molokai mountains, 4000 ft., 15th June 1893. 



(9) Mesothrisciis microps, sp. nov. 



Ferrugineus, nitidus, antennarum basi, palpis pedibusque flavis ; prothorace lateri- 

 bus posterius fere rectis, vix perspicue sinuato-angustatis, angulis exacte rectis ; elytris 

 humeris anterius prominulis, sat profunde striatis, ad apicem profunde sinuati-s. Long, 

 corp. 7 mm. 



This insect to some extent connects M. tj-ico/or with the abnormal M. abax. The 

 thorax is a little narrowed in front, the base is quite straight ; the angle formed by the 

 junction of the sides and base of the elytra is very marked, and projects somewhat 

 forwards. A single male example. The e.xact locality is somewhat doubtful, the 

 specimen being one of tho.se numbered 357, the entry for which is Haleakala, but, as 

 stated under AtelotJirns gracilis, the true locality is probably West Maui mountains. 



Hab. Maui (Perkins). 



(10) Mesothriscns abax, sp. nov. 



Piceus, nitidus, antennis palpis pedibusque rufis ; prothorace haud transverso, 

 lateribus posterius fere rectis, nullo modo angustatis, angulis exacte rectis ; elytris 

 humeris anterius prominulis, profunde striatis, ad apicem minus profunde sinuatis. 

 Long. Corp. 6^ — 7 mm. 



Plate VII. fig. 2. 



The form of the thorax distinguishes this from all the other species except M. microps, 

 in which, however, the thorax is less elongate. The colour varies from piceous to ferru- 

 gineous, the epipleura being pallid as in the other Mesoihriscus of the central islands of 

 the Archipelago. 



Hab. Molokai. — Maui. Molokai, 4500 ft., June and August 1893. Maui, 

 Haleakala, 5000 ft. 



(11) Mesothriscns katiaieusis, sp. nov. 



Fusco-testaceus, nitidus, antennis palpis pedibusque dilutioribus ; prothorace haud 

 transverso, basin versus fortiter angustato, angulis' perobtusis ; elytris profunde striatis, 

 interstitiis convexiusculis, septimo vix magis elevato. Long. corp. 7 mm. 



