158 MR. WESTWOOD ON SOME NEW 
1. Four posterior tibie, with a single spur to each. (Pachysoma, MacL.) 
2. Intermediate tibie with two spurs, posterior with one. 
A. Clypeus bidentate, thorax truncate behind, abdomen rounded. (Bacchus.) 
B. Clypeus 2—6—dentate, thorax rounded behind, abdomen square. 
(volvens, triangularis, &c.) 
The establishment of the genus Anamnesis by Mr. Vigors (in the eighth Number of 
the ‘ Zoological Journal’), and Deltochilum by Eschscholtz (in the Entomographien), 
have indicated the existence of two groups very nearly allied to Hyboma. Megathopa 
Eschscholtz, is closely allied to Circellum ; Scatonomus, Erichson, to Coprobius ; Drepa- 
nocerus, Kirby, to Eurysternus and Dendropemon, Perty ; Enicotarsus, Guerin, to Oni- 
ticellus. Such, as far as I am aware, are the only modifications suggested relative to 
the distribution of the Scarabeide, or additions made to the rest of its published genera 
since the publication of the Hore Entomologice. 
From a review of the two tabular sketches of the family presented above, it will be 
seen that indications in both are given of the separation of the family into sections from 
the general structure of the four hind legs; and it appears to me that a distribution 
founded upon such a character must be strictly natural, that is, with reference to the 
natural ceconomy of the species of which the two groups are composed, all the long- 
legged species being strictly ‘“pilularii” or dung-rollers, the habit being as strongly 
developed in the Sisyphi and Coprobii as in the Scarabei of MacLeay. 
We have seen that the essential character of the genus Scarabeus consists in the in- 
termediate tibie being only provided with a single spur : it appears to me, however, that 
if this be really the character of the genus, those Scarabei must be excluded which 
may be strictly said to have no spur on the intermediate tibie (Section I. 1. of Saint 
Fargeau and Serville). How far this observation, together with the description of the 
Scarabeus femoralis, may render necessary the modification of the characters of the genus 
Scarabeus, must be left for others more competent to the task than myself to decide. 
I will only observe that the Ateuchus adamastor of Saint Fargeau and Serville, and the 
insects hereinafter described, appear to be so intimately connected with species of the 
genus Scarabeus, MacLeay, that in my humble opinion the points of connexion between 
them and Scarabeus are far too numerous to be overweighed by their possession of a 
pair of spurs on the middle tibig, which alone separates them from that genus ; while at 
the same time the characters of Ateuchus adamastor and the insect first hereinafter de- 
scribed seem even to render necessary an extension of the characters of the subgenus 
Heliocantharus, with which they entirely agree, except in the possession of a pair of 
spurs on the intermediate tibia. I have, however, provisionally regarded these, as well 
as the others, as distinct types, and which a further analysis of the long-legged Scara- 
beide may perhaps prove to be essential. 
