80 Mr. D. Sharp on some 



head (including, so far as I can see, the parts of the 

 mouth) are extremely similar in the two genera, except 

 that the eyes are totally wanting in Langelandia, and 

 are present, though extremely reduced in size, in Chorasus. 

 The structure of the under surface is similar, except that 

 in Chorasus the epipleurse are broad and nearly hori- 

 zontal, and the ventral segments are comparatively 

 shorter. The tarsi are undoubtedly 4-jointed. The claim 

 of Langelandia to be admitted into the Colydiidce is abso- 

 lutely confirmed by this most interesting insect. 



Chorasus suhaecus, n. s. 



•Piceus, pedibus piceo-rufis, antennis rufis, opacus, 

 quasi squamatim-granuloso, elytris longitudinaliter cos- 

 tatis ; prothorace magno, margine anteriore utrinque 

 profunde sinuato, in medio setuloso. Long. 2f mm. 



Head with a comparatively shining space on the 

 middle, impressed on either side of this. Thorax large, 

 about as long as broad ; owing to the deep sinuation on 

 either side of the front margin, the middle has the 

 apijearance of being produced, and this prominent part 

 bears closely-set, curled upwards, pale setse ; behind this 

 is an indistinct longitudinal impression, and the surface 

 shows a very peculiar sculpture, something like scales, 

 or as if there had been tubercles shaved off. The elytra 

 are scarcely twice as long as the thorax, and are some- 

 what narrowed behind, and a little truncate at the 

 extremity ; they bear a sculpture somewhat similar to 

 that of the thorax, except that they are smaller, are less 

 definite, and are suboblong instead of round ; from the 

 base there starts a rather sharply elevated longitudinal 

 elevation, which extends two-thirds of the length, and 

 external to this are one or more very much shorter and 

 more indistinct elevations. 



This creature is, notwithstanding its small size, 

 one of the most interesting of Mr. Helms' discoveries 

 at Grey mouth. 



Acosmetus reitteri, n. s. 



Subquadratus, crassus, elytris elevatis, fucco-niger, 

 superne in elj^tris tuberculis maximis et inasqualiter 

 fulvo-tomentosus, setulisque erectis adspersus, antennis 

 pedibusque rufis. Long. 4, lat. 21 mm. 



