532 SUPPLEMENT 



on the sui-face of the cornea of the eyes, and seem to cut off 

 a part of it. 



The head of the Lucani is more or less bulky; that of the 

 male is more so than that of the female. It is broader than 

 long, angular, often irregular, with some elevations more or 

 less projecting. The hood is tolerably large, and advanced 

 into a point. The mandibles are very large, strong, corneous, 

 arched, and denticulated internally. Those of the female 

 are less long than those of the male. 



The corslet is a little convex above, rounded at its sides, 

 and more or less edged. The scutellum always exists, only it 

 is but little visible in some species. The elytra are hard, of 

 the length of the abdomen. They cover two membranaceous 

 and folded wings, of which the insect frequently makes use 

 for the purpose of flying. The feet are long ; the anterior 

 legs are denticulated laterally. All the tarsi are composed 

 of five articulations, the last of which is armed with two 

 hooks, accompanied by an intermediate appendage, terminated 

 by two divergent silken hairs. 



The larva is very thick ; its body is curved into an arch, 

 and composed of thirteen rings ; its head is brown, scaly, 

 armed with two strong jaws, of which it makes use to gnaw 

 wood, which it reduces to a sort of tan. It has six scaly 

 feet attached to the first three rings. Arrived at its final 

 growth, it constructs, in the wood in which it has lived, a 

 shell or cell, with the sawdust of the wood which it has 

 gnawed. In this shell it becomes changed into a nymph, 

 from which it does not issue until it has attained the form of 

 the perfect insect. Roesel believes that six years are required 

 for the larva to attain to its perfect growth. 



The lucani live but a short time in their final form. As 

 goon as they have undergone their last metamorphosis they 

 seek to couple, and lay their eggs. They then perish in a 

 very short time after. They live, according to the observa- 



