451 



Fig. 402. 



united into a compact club, as in the Scarabeidce, and the 



mentum is usually large. The genus Lucanus, called the Stag- 



horn beetle, is of large size, with enormously developed jaws 



in the male, as in Lucanus 



dama Fabr. (Fig. 402, 



$). The larva of Lu- 



canus dama (Fig. 403, and 



cocoon, natural size) is 



long, thick, nearly cylin- 



drical, and the corneous 



rust-colored head is armed 



with two large jaws. Liv- 



ing in rotten wood, like 



the Cerambycidce, it 



constructs a cocoon of the 



chips it makes. The larva 



of the European L. cervus 



is stated by Roesel to live 



six years. Harris states that they lay their eggs in crevices of 



the bark of trees, especially near the roots. The larvae resem- 



ble the grubs of the Scarabaeans in color and form, but are 



smoother, being less 

 wrinkled. Dorcas bre- 

 vis Say (Fig. 404) is 

 an exceedingly rare in- 

 sect whose habits are 

 unknown. In Passalus 

 cornutus Fabr., belong- 

 ing to a more aberrant 

 genus, the body is long 

 Fig. 403. and flattened with a 



short bent hook on the head, and the elytra deeply striate. 



Madam Merian describes the larva of Passalus as being a 



thick fleshy worm, with a small scaly head, six legs, and 



slender posteriorly ; it lives in decaying wood. 



Erichson. This family, the LamelUcornia of 

 Latreille, is one of immense extent, being divided into more 

 than 700 genera, comprising some 6,000 species, or three- 



