80 Mr. G. Lewis on 



lished by him six years later in the Zool. Journ. vol. v. p. 215 

 (1835). The typeof the genus is figured with dissections, t.xlvi. 

 fig. 1 ; and as Professor Westwood has very kindly sent me 

 the type for examination, I am able to say positively that his 

 type is an American insect and the same as H. americanus 

 of the list at the end of this paper. For many years con- 

 fusion existed in the nomenclature of this species owing to an 

 impression in the minds of the earlier entomologists that 

 exaratus, Illiger, from America, and exaratus, Serv., from 

 Europe, were specifically the same. The characters on which 

 I rely to separate Rhysodes from Einglymmius are the trun- 

 cate (or nearly so) terminal joint of the antennse, the median 

 raised surface of the head abbreviated, and the prominent and 

 reflexed humeral angles of the elytra ; but in the list at the 

 end of the paper I have included in it some species which 

 perhaps may not eventually be left in the genus. I allude 

 more especially to Rhysodes arcuatus, Chevrolat, from New 

 Zealand, which has the last joint of the antenna distinctly 

 conical ; and perhaps this insect is nearer to Clinidium, or 

 may finally be placed in a new genus. Captain Broun 

 (owing I suppose to the great rareness of the New-Zealand 

 species) has not yet distinguished the sexual from the specific 

 characters. For the proper working out of insects of this 

 class a long series is veiy desirable, but unfortunately rarely 

 obtainable. 



Rhysodes crassiusculus. 



B. americano simiUimus at latior, tibiis anticis c? in medio spinosis, 



posticis valde dilatatis. 

 L. 6^-7 mill. 



This species is very similar to the well-known R. ameri- 

 canus of North America. It is, however, broader, the head 

 has the hind angles below the eyes a little prominent, the 

 cephalic lobes viewed sideways will be seen to project in a 

 marked manner over the neck, and the thoracic elevations are 

 sparsely but distinctly punctate. The male has a strong- 

 tooth in the middle of the interior edge of the fore tibias (the 

 only species known to me with it) and a second on the ante- 

 rior femur ; the apex of the middle tibia has two claw-shaped 

 spines and the hind tibia is robust, bent inwards from the 

 middle, and from the point of the bend conspicuously dilated. 

 The dilatation is three times the extent of tliat in R. ameri- 

 canus. The female is wanting in these characters, except 

 in the femoral tooth, which is, liowever, much less conspi- 

 cuous ; it has the middle segment of the abdomen largely 

 excavated at the sides. 



