2i6 FAUNA HAWAIIENSIS 



Doubtfully distinct from C. posficahis, though wanting the broad yellow apex of the 

 elytra. The thorax is a little narrower. 



Hab. Kauai, Perkins. Very rare: found in the same localities as C. posiicatiis. 



Atelothrus, gen. nov. 



Alae vestigiales. Prothorax utrinque seta unica ad angulum posteriorem sita 

 munitus. 



In the highly aberrant A. transieits the thoracic setae are very rarely present, but 

 the pits of their insertion exist. 



(i) Atelothrus politics, sp. nov. 



Elongatus, angustus, nitidus, niger, antennis, palpis pedibusque flavis, elytrorum 

 margine laterali angustissime rufescente, thorace plus minusve picescente, abdomine 

 flavo-variegato ; elytris sat profunde striatis, striis ad basin discretis, interstitiis politis. 

 Long. 8 mm. 



Closely allied to A. crro, but readily distinguished by the polished elytra, the striae 

 of which are deeper and not so effaced at the base. The thorax is a little sinuate at 

 the sides behind ; the hind angles would be almost rectangular were it not that the 

 base is sloped where it joins the sides, so that the angles are markedly acute ; the sides 

 behind are but little elevated. 



H.\B. Maui (Perkins); Haleakala, 5000 ft., in INIarch, April and May 1894, and 

 in September and October 1896. Some of the specimens are described as found under 

 bark oi Acacia. 



(2) Atelothrus erro, Blackburn. 



Anchomemis erro Blackburn, Ent. Mo. Mag. xv. 1877, p. 121. 



Platynus planus Karsch, Berlin, ent. Zeitschr. xxv. 1881, p. 2. 



This is closely allied to A. politus as already mentioned, but is readily identified by 

 the peculiar dull surface of the elytra, due to a dense minute sculpture, and by the less 

 deep striation of the elytra, all the striae being very fine at the base, and some indeed 

 of the outer quite effaced there. We have received about 300 specimens of A. ei'ro, 

 and there can be no doubt it is distinct from that species and not merely a dimorphic 

 form, as there are slight differences in form and colour ; these, however, are not so 

 constant as the diagnostic characters mentioned. 



Hab. Maui (Blackburn, Perkins) ; Haleakala, 4 — 5000 ft., in March, April and 

 May, and in September and October. The localities and dates are the same as those 

 for A. politus, and if these two closely allied species do not actually live together, they 

 must be very close neighbours. 



