20 



ON THE CETONIIDiE OF SOUTH AFRICA. 



between the angles of the prothorax and elytra ; it also differs in having the scape of the 

 antennae reduced to a more ordinary size, and in having the maxillae often furnished with 

 hair, among which occur those horny teeth which always arm the terminal process of these 

 organs of the mouth, and thus form the distinguishing character of the genus, which how- 

 ever approaches near to the genus Cetoninus, by the affinity of transultation. 



fl Oplostomus, M'L. 



A. — Mentum not emarginate.<| 2 Anoplocheilds, M'L. 



1^3 DiPLOGNATHA, G. P. 



B. — Mentum deeply emar-^^4 Gnathocera, K. 



[_5 Macroma, K. 



Mentum having a process on its under side. 



Mentum narrow with its under side simple. 



Mentum broad with its under side simple. 



'Outer side of terminal process of maxillee clothed with a 



brush of hairs. 

 Outer side of terminal process of maxiUse with no brush. 



Note. The plantul^ and pseudonychia are distinct in all these sub-genera except in Macroma, where 

 they are evanescent. I have given Gory the credit of the sub-genus Diploc/natha, although he has in- 

 cluded insects in it which do not belong to the groupe. 



Sub-genus 1. Oplostomus, M'L. 



36. This sub-genus retains many of the characteristics of Cryptodinus, particularly in the 

 antennae, mentum, maxillae, &c. as will be seen from the following description, viz. 

 Antenna; of ten joints, with the scape sub-triangular depressed above, and as long as 



the next six joints taken together, or as the ovate clava, which consists of three 

 joints. 



Mandibles corneous, with a blunted point, having the membranaceous part small. 



Maxillcs corneous, prismatic, hirsute at the back, with the terminal process composed of a 



long sharp hooked tooth, and the inner process armed at the point with a smaller 



sharp tooth. 



Maxillary palpi shorter than maxillae, with the last joint twice as long as the rest taken 



together, and having the first joints evanescent. 

 Labial palpi remarkably short, with the two first joints evanescent. 



Mentum sub-quadrate, forming a transverse triangular prism ; in front it is truncated with the 

 sides rounded off ; in the middle is the transverse ridge, forming a prominent obtuse 

 angle ; at the sides there is a tooth, that projecting forms a sinus for the labial palpus, 

 which appears at first sight to have only one joint. 



Head small, with quadrate clypeus. Prothorax trapezoidal, emarginate behind. Scu- 

 tellum large, triangular. Epimeron distinct between prothorax and elytra. Elytra 

 with shoulders slightly lobate. Body depressed like Cetonia morio. Mesosternum 

 narrow, blunt, not advanced between the legs. Feet short, with the anterior tibiae 

 externally bidentate. 



37. Olivier has described an insect from Senegal, under the name of Cetonia fuliyinea, which 

 MM. Gory and Percheron, have, with some reason, assigned to their genus Cremastocheilus. 

 It may however be easily separated from that groupe by the circumstance of the epimeron 

 being prominently distinct between the prothorax and the shoulders of the elytra. I believe the 

 following insect brought from the Cape by Dr. Smith, to be identical with the Senegal species. 

 At least I can observe no very important difference between the description of OUvier's insect 



