438 INSECTA. 



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

 in both sexes. The mentunn 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 rounded exteriorly. 

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

 males is furnished with a horn. 



SiNODENDRON, Fab, 



Antennal club formed by the three last joints(l). 



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 ihorax 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. 



iEsALus, 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 tibice are compressed and triangular, and the sternum 

 simple or without any projection(2). 



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 maxillare 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(3). 



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

 mate to Lamprima in their prolonged mesosternum, projecting, 

 however, 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 

 but slightly elevated, particularly in the females. The labrum is 

 concealed, the anterior tibiae are narrow and without a palette. The 

 palpi and lobes of the ligula are more elongated. 



(1) Scarabaeus cylindricus,la.x, Oliv., Col., 1,3, ix, 88. It is the only species 

 known, the remaining Sinodendrons of Fabricius belonging to other genera. 



(2) Msalus scaraha£oid£s. Fab.; Panz., Faun. Insect. Germ, XXVI, 15, 16. 



r* (3) Lat. Gener. Crust, et Insect., II, p. 132; Lethrus xneus, Fab.; Schreib., 

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



