414 CLAVICOKNIA — HISTERIDAE. 



a. Outer lateral stria on elytra absent. 



Black, shiny ; each elytron with a large crescent-shaped 

 red spot, often interrupted, sometimes absent. Thorax 

 with two lateral striae, inner one entire, outer one al)bre- 

 viated ; elytra without sutural striae, first dorsal stria 

 extremely short, second nearly reaching middle, the other 

 three entire, curved in different directions; refiexed margin 

 with two furrows, depressions punctured; anterior tibiae 

 with three teeth, apical one simple ; propygidium punc- 

 tured at margins, pygidium closely and tolerably strongly 

 punctured. L. 4 — 5 1. Rather common. 



H. quadrimaculatus, Lin. 



&. Elytra with outer lateral stria. 



I. Thorax with two lateral striae on each side. 



1. Inner and outer lateral striae on elytra not 

 united ; three outer dorsal stria entire. 



Black, moderately shiny. Inner lateral stria on thorax 

 slightly abbreviated at base, outer one reaching middle only; 

 elytra with sutural stria abbreviated from middle, depression 

 of reflexed margin punctured, with two furrows ; anterior 

 tibiae with three teeth, apical one bifid ; propygidium dif- 

 fusely, pygidium rather more closely punctured. L. 4 — 5 1. 

 Common. H. unicolor, Lin. 



2, Inner and outer lateral striae on elytra united 

 and continuous ; four outer dorsal striae entire. 



A A. Anterior tibiae with five or six teeth. 

 a (I, Marginal impression of forehead semi- 

 circular ; prosternal process truncate or 

 slightly notched at apex. 

 Oval. Black, sliiny ; club of antennae gray. Lateral 

 striae on thorax almost entire ; elytra with sutural stria 

 abbreviated from middle, subhumeral depression with one 

 furrow, strongly punctured ; propygidium closely, pygidium 

 more closely but less strongly punctured. L. 3 — 4 1. Com- 

 mon. H. cadaverimts, E. H. 



b h. Marginal impressions on forehead pointing 

 backward at their place of junction ; pro- 

 sternal process pointed in front. 

 Similar to H. cadavcrinus but with pygidium more closely 

 and finely punctured; mesosternura with a slight triangular 



