CUCUJIDAE. 95 



Sub-Family III.— CUCUJIDAE (genuini). 



In this sub-family the anterior coxal cavities are open behind, 

 and the base of the maxillse is exposed. The tarsi are filiform, 

 either 5-jointed, or with the hind ones of the males 4-jointed. 



Two tribes are indicated by our genera : — 



Antennae with the first joint moderate. Cdcujini. 



Antennae with the first joint elongated. Brontini. 



Tribe I.— CUCUJOTI. 



The typical genus Cucujus is represented in our country by 

 two species. They are bright scarlet-colored, depressed insects, 

 less elongate than Catogenus, with the elytra punctured, with 

 three faintly-marked smooth lines. C. clavipes is found on the 

 Atlantic slope, C. puniceus in Oregon and Russian America, 

 ^'arthecius contains a small species from Pennsylvania, which is 

 very remarkable for its cylindrical form and very large head, 

 Which, with the thorax, more than equals in length the elytra. 

 The other genera are composed of small insects, occurring on 

 both sides of the continent. The posterior tarsi are 4-jointed in 

 the males. 

 Posterior angles of the head prominent, rounded ; antennae not thickened 



externally. Cucujds. 



Posterior angles of the head none ; presternum narrow ; antennae with the 

 last three joints wider, the intermediate ones unequal ; elytra not striate. 



Pediacus. 

 Posterior angles of the head none ; presternum very wide ; antennae usually 

 long, slender, the last three joints sometimes slightly dilated ; elytra 

 obsoletely striate ; head and thorax with a fine elevated line or one or 

 two striae near each side ; spurs of the anterior tibia? unequal ; 

 Body much depressed. L^mophlceus. 



Body cylindrical ; head very large (antennae less elongated). 



Narthecitjs. 



Tribe II— BROXTI1VI. 



This tribe consists of two genera, found on both sides of the 

 continent, and also in Europe. Brontes is generally diffused, 

 Dendrophagus only in the northern regions. The elytra are 

 striate in both. 



Body very elongate ; sides of thorax parallel ; mesostemum truncate in 

 front. Dendrophagus. 



Body less elongate ; sides of thorax strongly serrate, anterior angles pro- 

 longed ; mesostemum broadly emarginate in front. Brontes. 



