NITIDULIDAE. 149 



Maxillce with one lobe; antennae distinctly capitate. 

 Protliorax not margined at base ; head horizontal. 



Abdomen with two segments exposed. C^ARPorniLiNi. 



Abdomen cover<;d or pygidiurn partly exposed. Nitidulixi. 



Protliorax margined at base, covering the base of elytra, head 



more or less deflexed. ('ycuramini. 



Labrum connate with the epistoma. Ipini. 



Tarsi 4-jointed ; body contractile. 



Thorax margined at base, covering the base of the elytra. 



Cybocephalixi. 



Tarsi 3-jointed ; body elongate. Smicripini. 



Antenna; lU-jointed, club 2-joiuted; tarsi dissimilar in the sexes, luitero- 



merous in the males. Ruizopuagini. 



Tribe I.— BRACHYPTERI]«I. 



Antennae clevon-jointed, terminated by a three-jointed (two iii 

 some Cercus) club, usually gradually formed and not of compact 

 construction. Labrum distinct, usually small, often deeply emar- 

 giiiate. Maxillte with two lobes. Anterior co.xob narrowly inclosed 

 behind. Tarsi dilated. No anteniial grooves are seen below the 

 eyes, and by this character the genera may be distinguished from 

 all of those of the next tribe which occur iu our fauna. 



The genera are : — 



Claws distinctly toothed at base. 



Elytra margined, epipleurai distinct. Brachypterus. 



Claws simple or very nearly so. 



Elytra margined, epipleurae distinct. Cercus. 



Elytra not or extremely feebly margined, epipleurse indistinct. 



Form convex ; terminal % segment visible beneath only. Amartus. 

 . Form depressed; terminal ^ segment rather large, visible above. 



Anthonaeus. 



The males have a small apical dorsal segment. The species 

 are found on flowers. 



Tribe II.— CARPOPIIII.I!VI. 



The species of this tribe are usually flattened, though some of 

 the species of Carpophilus are moderately convex. Maxillae with 

 one lobe. Anteuna? torniinated by an abrupt three-jointed club, 

 antennal grooves distinct. Tarsi dilated, but sometimes feebly. 

 Two or three segments of abdomen visible beyond the elytra. 

 The males have a small dorsal sixth segment. The ungues are 

 simple. The species live some on flowers, some under bark. 



