108 DESCEIPTION OF NEW COLEOPTERA, 



3. — Odacantha latipennis. 



Olivaceo-nigra, capite thoraceque punctatis, ely tris pubescentibus 



striato-punctatis apice testaceis, palpis pedibusque flavis. 

 Long'. 4 lin., lat. 1| lin. 



The antennoe of this insect are testaceous. The head and 

 thorax are black, and coarsely punctured : the latter, which is of 

 the same width as the head, has a longitudinal ridge on the sides, 

 and is but slightly narrowed behind. The elytra are of a dull 

 greenish black, with the apex of a yellowish brown ; they are 

 twice the width of the thorax, are striated, coarsely punctured, 

 covered with light-coloured decumbent hairs, and, at the apex, are 

 but slightly truncated. The legs are of a pale yellow. 



I have some doubt as to the genus of this insect. The organs 

 of manducation agree with those of Odacantha, but the general 

 habit is rather robust for that genus. Tlie specimens obtained 

 were found floating down the River Don during a flood. 



4. — Helluo sulcatus. 



Niger, capite punctato, thorace punctatissimo medio leevi, elytris 



octo-sulcatis sulcis biseriatim punctatis. 

 Long. 9| lin., lat. 3 lin. 

 The upper surface is of an uniform brownish black. The head 

 is coarsely punctured, with an impression in the middle of the 

 clypeus. The thorax is densely and closely punctured, with the 

 medial line smooth and not deeply marked. The elytra have each 

 tig'ht furrows, with a double row of deep punctures in each. The 

 under surface is of a pitchy line. 



I have not been able to dissect a specimen of this insect, but 

 its appearance is completely that of a Helluo, and it seems to 

 :igree with that genus in every thing, except in the shape of the 

 iiuntum. 



5. — Helluo grandis. 



Niger sabnitidus, thorace antice subobtuso marginibus puncta- 

 tis, elytris striatis subtiliter punctatis. 

 Long. 17 lin., lat. 5 lin. 

 This insect has a strong resemblance to the H. lotujlpennis of 

 Germar ; the most conspicuous point of difference being in the 



