COLEOPTERA 229 



apices scarcely at all prolonged behind the sinuation ; the junction of the lateral and 

 basal margins forms a definite, though very obtuse angle ; they are deeply striate, and 

 the interstices are a little convex. The legs are slender, the fourth joint of the hind 

 tarsus scarcely at all bilobed. One male. 



Hab. Kauai (Perkins). Without indication of locality or date. 



(2) Platymis calathiforviis, sp. nov. 



Angustus, parum nitidus, piceus, elytrorum margine rufo, antennis palpis pedibusque 

 testaceis ; thorace basin versus vix angustato, angulis posterioribus rectis ; elytris sub- 

 tiliter striatis, striis ad basin obsolescentibus. Long. i\ mm. 



This species resembles only Atelothi-us erro, from which it is readily distinguished 

 by the thorax being slightly broader at the base than it is at the front angles. The 

 base is quite straight and the hind angles are very sharply marked. The seventh stria 

 can scarcely be detected near the base. The fourth joint of the hind tarsus is not lobed. 

 The female has three setae on each side of the last ventral segment. Five specimens. 



H.AB. Maui (Perkins). Haleakala, 4000 — 5000 ft., March and April 1894. 



Mecostomus, gen. nov. 



Mandibulae elongatae, acuminatae, parum curvatae. Palpi elongati, labiales per- 

 tenues. Thora.x elongatus, utrinque seta erecta ante medium lateris sita. 



This senus can onl\ be placed next to Mesothrisciis ; although there are no 

 connecting links between the two, I think it is undoubtedly allied to the genus in 

 question more nearly than it is to Mcconicuns, which is the only genus having a similar 

 mouth-structure. Mccomemis appears indeed to be allied to Mctrovieniis rather than 

 to Mecostomus. The elongation of the trophi is analogous to that of the European 

 genus Siomis, but there is no other affinity between the two, and the trophi are far 

 from similar in their details. There is a single well-marked seta on the middle of each 

 side of the thora.x. The female has two abdominal setae on each side of the last 

 ventral plate. 



( I ) jMecostonnis pcrkinsi, sp. nov. 



Angustus, subparallelus, piceus, nitidus, palpis antennis pedibusque flavis ; pro- 

 thorace elongato, lateribus posterius sinuatis, angulis posterioribus rectis ; elytris sat 

 profunde striatis, ad apicem fere esinuatis. Long. corp. 7 mm. 



Plate VL fig. II. 



This is readily identified by the elongate mandibles. In general form and appearance 

 it has some resemblance to the narrowest examples of Mcsothriscus abax, but it is very 

 different on account of the thorax being narrowed behind and of the elytra being much 



