COLEOPTEltA. 439 



Ryssonotus, Mac L. 



The mandibles of the males, as in Lamprima, forming a vertically 

 compressed, angular and dentated forceps(l). 



Pholidotus, Mac L. Chalcimon, Dalm, Lamprima, Schoenh. 



Where the mandibles in the same sex are very long, narrow, 

 arcuated, terminated in a hook curved downwards and securiform 

 on the inner side. 



The club of the antennae formed by the three last joints is less 

 pectinated than in the others, and almost perfoliaceous. The men- 

 turn covers the maxillse(2). 



In the following subgenera the mesosternum does not project. 

 The head is as wide as the thorax or (in various males) wider. The 

 mandibles are glabrous or at least without a thick down on the inner 

 side. The body is always flattened. 



Here, the eyes are not cut transversely by the margin of the head; 

 the maxillae are terminated by a very slender penicilliform lobe with- 

 out corneous teeth. 



Lucanus, Lin. 



The digestive canal of the true Lucani is much less elongated 

 than that of the Scarabseides, but the esophagus is much longer. 

 The male organs of generation also differ greatly from those of the 

 preceding Insects, the testes being formed by the circumvolutions of 

 a spermatic vessel, and not by an agglomeration of seminal cap- 

 sules. The adipose tissue, which almost disappears in the Scara- 

 bseides, is here abundant and disposed in clusters, which converge 

 to the median line. 



The larva of the L. cervus, which inhabits the interior of the Oak 

 for several years previous to its final metamorphosis, is considered 

 as the Cossus of the Romans, or that verminiform animal which 

 they regarded as a delicious article of food. 



L. cervus, L. ; Oliv., Col., I, i, 1; Roes., Insect. II; Scarab., I, 

 iv, v. The male two inches in length, and larger than the fe- 

 male; black, with brown elytra; head wider than the body; man- 

 dibles very large, arcuated, with three very stout teeth; two of 



(1) Lucanus nebulosus, Kirb., Lin. Trans., XII, xxi, 12; Mac L., Hor. Entom., 

 I, p. 98. 



(2) Lamprima Humboldii, Schoenh.; Chalcimon Humboldii, Dalm., Ephem. 

 Entom., I, p. 3; Pholidotus lepidosus, Mac L., Hor. Entom., I, p. 97, the male; 

 Cassignetus geotrupoides, ejusd., the female. 



