ELATERIDAE. 165 



the tip; the antennae (flabellate and 12-jointed in Hemirhipus) 

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

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

 aud 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 pubescence. 



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.— EEATERINI. 



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 antenna? not received in prosternal grooves, 

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

 thorax narrow. The mandibles are short, and never extend far 

 beyond the labrum ; they are usually emarginate, rarely subacute, 

 but not much prolonged at the apex ; in the latter case, however, 

 the metasternum is not acute in front, as in the next tribe. 



Sub-tribes may be defined as follows : — 



Coxal plates suddenly dilated inwards. Elaterini. 



Coxal plates gradually dilated inwards. Corymbitini. 



Sub-Tribe 1. — Elaterini (genuini). 



No other character can be given to separate this sub-tribe from 

 the next but the form of the plates of the hind coxae, which are 

 suddenly dilated about the middle, with the outer part much nar- 

 rower than the inner ; there is always a strong tooth at the 

 insertion of the thighs ; the front is margined anteriorly in all of 

 our groups except the last; the prosternum is always lobed in 

 front; the prosternal sutures are double, except in the first two 

 groups, where they are entirely simple ; the mandibles emarginate 

 or toothed at the tip ; the tarsi are variable in form, but the claws 

 are never serrate. 



The following groups are represented in our fauna : — 



Margin of the front elevated behind the labrum ; 

 Prosternal spine truncate behind ; scutellum cordiform. Cardiophori. 

 Prosternal spine acute ; scutellum oval ; 

 Prosternum broad, sutures single, convex outwards. Cryptohypni. 



