34 IKSECTA. 



less beyond the mentum. The scutellum is situated between the 

 elytra. 



The first section will form the genus 



LuCANUS. 



"We will make a first division with those in which the antennal club 

 consists of but from three to four joints or leaflets. 



We will begin with Insects, which, with the exception of their 

 antennae, are almost entirely similar to Oryctes, a subgenus of the 

 preceding tribe. The mandibles are concealed, edentate, and alike 

 in both sexes. The mentum is almost triangular, and completely 

 conceals the ligula, as well as the base of the maxillae. The body is 

 thick and convex above, almost cylindrical and roimded exteriorly. 

 The thorax is truncated and excavated before. The head of the 

 males is furnished with a horn. 



SiNODENDRON, Fah. 



Antennal club formed by the three last joints*. 



Those which have a thick, convex, ovoid body; mandibles forming 

 a compressed and vertically projecting forceps in the males ; a head 

 much narrower than the thorax measured in its greatest width ; and 

 the tibiae, at least the two anterior ones, broad and in the form of a 

 reversed triangle, form two subgenera, viz. 



^sALUs, Fab. 



Where the mandibles, even in the males, are shorter than the head, 

 and terminated posteriorly in the manner of a horn ; the mentum 

 conceals the maxillae ; the ligula is very small ; the body short and 

 arched ; the head almost entirely received into the emargination of 

 the thorax ; the tibiae are compressed and triangular, and the sternum 

 simple or without any projection f. 



Lamprima, Lat. 



Where the body is more elongated ; the mandibles much longer 

 than the head, in the males laminiform, vertical, angular, much 

 dentated and pilose on the inner side ; the maxillae are exposed down to 

 the base ; the ligula very distinct ; the labrum elongated ; the two 

 anterior tibiae widened, and offering in the males a palette (spur) in 

 the form of a reversed triangle, and a sternal point +. 



Two other subgenera established by M. Mac Leay, Jun., approxi- 

 mate to Lamprima in their prolonged mesosternum, projecting, how- 

 ever, less than in the preceding ones, in the head, which is much 

 narrower than the thorax, and finally in their mandibles, the inner 

 side of which is furnished with down ; but their body is flattened or 



* Scm-ahceus cylindricus, L. ; Oliv., Col., I, 3, ix, 88. It is the only species knows, 

 the remaining Sinodendrons of Fabricius belonging to other genera. 



•)■ yEsatus scarahaoides, Fab. ; Panz., Faun. Insect. Germ., XXVI, 15, 16. 



X Lat. Gener. Crust, et Insect., II, p. 132, Lethrus census, Fab. ; Schreib., Lin. 

 Trans., VI, 1. See also Mac Leay, Hor. Entom., I, 99. 



