ELATEKIDAE. }81 



Tribe II.— CHALCOLEPIDIIjVI. 



The genus Chalcolei)i(lius is represented by lour species, one 

 (C viridipilis) found in tlie Atlantic States, two in Arizona, and 

 one in southern California. They are very large insects, clothed 

 with depressed scales ; the mesosternum is protuberant, and en- 

 tirely connate with the nietasternum, the suture being obliterated. 

 The antennae are pectinate in tlie male of C. viridipilis and ania- 

 7-agdi)ius. The genus Alans is known by two large velvety spots 

 on the prothorax; it is commonly separated widely from Chal- 

 colepidius, but the protuberant mesosternum, closely connected 

 with the metasternum, with scarcely a trace of suture, indicates 

 its affinity with that genus. The form of body, too, is not unlike. 

 In both genera the coxal plates are gradually dilated inwards, 

 and strongly toothed at the insertion of the thighs; the mandibles 

 have the tip entire, but not prolonged ; the front is concave, not 

 margined behind the labrum, but deflexed ; the tarsi are not lobed 

 beneath, but very densely pubescent, and the claws are simple. 



Scutelluni obcordate ; margin of elytra obsolete in front. Chalcolepidius. 

 Scutellum oval ; elytra strongly margined. Alaus. 



Tribe III.— HEMIRHIPIjVI. 



In this tribe, represented only by Hemirhipus fascicularis, the 

 front is concave, margined anteriorly ; the mandibles are acute at 

 the tip; the antennae (llabellate and 12-jointed in Ilerairhipus) 

 liave the first joint very long, and the others small and equal in 

 size; the prosternal lobe is large, the sutures are concave outwards 

 and double; the coxal plates are equally broad at the inner and 

 outer portion, with a tooth at the origin of the thighs; the tarsi 

 are not lobed beneath, but densely clothed with fine ])ubescence. 



The species extends from New York to Brazil, is of large size, 

 densely clothed with short brown pubescence; black, with the 

 elytra muddy yellow, varied with small dusky spots. 



Tribe IV.— ELATERIIVI. 



This tribe comprises the great bulk of the species, and contains 

 many genera differing in various peculiarities of structure, but all 

 agreeing in having the antennae not received in prosternal grooves, 

 the mcsosternal suture distinct, and the side pieces of the meta- 



