.'588 Mr. D. Sharp's Contributions to tJie 



the Aucccus niegaccijhalas to be most allied to Uspiiius ; 

 but the two insects I have described as //. clavipes and 

 //. Fauvcli differ in a highly important respect from the 

 species of XzA^pm^s, inasmuch as they have the front coxte 

 exserted and not covered or separated by any process 

 similar to that which is so conspicuous in Lispinus. I 

 must not be understood as implying that the two insects 

 I here allude to will be ultimately considered congeneric 

 with the other Holotrochi here described, for I consider 

 that in the present state of our knowledge of these Stn])hy- 

 linidcc it is quite impossible for us to decide where there 

 really occur those separations and gaps between species 

 Avhich warrant the formation of genera. 



e>" 



1. Ilolotrochus durus, n. sp. Niger, glabei*, nitidus, 

 parce sed distincte jumctatus, an tennis piceis, pedibus 

 piceo-rufis. Long. corp. 3^ lin. 



Mas : abdomine segmentis ventralibus 6 et 7 profunde 

 impressis. 



Antennaa stout, shorter than head and thorax, insertion 

 near the front of the eye in a large cavity, greatly over- 

 lapped by the side of the clypeus; 1st joint much con- 

 cealed, and thick, 2nd joint small, 3rd a good deal longer 

 than 2nd, dilated towards the extremity; joints 4—10 

 transverse, 11th rather narrower than lOth, obtusely 

 pointed; the six basal joints are pitchy, the others red, but 

 this colour is much obscured by the pubescence. Head 

 much narrower than the thorax; clypeus greatly rounded 

 in front; the surftice shining and rather finely and sparingly 

 but quite distinctly punctured. Thorax scarcely so long 

 as broad, almost broader than the elytra; the sides a little 

 rounded towards the fi-ont, nearly straight behind the 

 front, and thence only very slightly narrowed to the base ; 

 the hind angles almcjst right angles; the surface is shining 

 black, rather sparingly but distinctly punctured; it is 

 transversely convex, the sides margined, the base closely 

 aj)plied to the elytra and not margined; near the hind 

 angles are traces of a longitudinal impression. Elytra 

 slightly longer than the thorax, with a well-marked 

 sutural stria moderately finely and sparingly pimctm'ed, 

 with an indistinct longitudinal series of four or five larger 

 punctures along the middle. Hind body with segments 

 2 — 5 of equal width, each segment smooth in the middle, 

 obscurely punctured at the sides, less shining than the fi'ont 



