NORTH AMERICAN COLEOPTEKA. 263 



Alternate intervals of the elytra, 3-5-7-9, witli a row of coarse punctures. 

 Thorax with the lateral series of coarse punctures; the base without marginal 

 line. 



Elytia with well marked strife; form oblong fuscipes. 



Elytra with rows of fine punctures; form short and very convex. 

 Posterior femora merely closely punctate near base, not opaque and pubes- 

 cent. PI. iv, fig. 7 t'liiiiiflus. 



Posterior femora densely punctulate and pubescent near base and along 



the upper border. PI. iv, fig. 4 globosus. 



Thorax without the lateral series of coarse punctures; basal marginal line dis- 

 tinct near the sides latllS. 



Alternate intervals without the series of coarse punctures. 



Thorax with traces of basal marginal line at sides; surface opaque, subgran- 

 ular; elytra without trace of scutellar stria; form oval, not very 



convex scabrosus. 



Thorax without trace of basal marginal line; surface shining; elytral striae 

 deep, the scutellar very well marked, intervals smooth and convex. 



tessellatns. 



In the table used in iny former essay on these insects the carinse 

 of the pro- and nieso-sterna were given considerable proniinence as 

 characters for separation, but the increase of material for study has 

 shown that both carina are subject in one si)ecies or other, to too 

 much variation to enable them to be used with certainty. 



H. Tiiseipes Linn. — Oblong, convex, piceous, shining. Head closely punc- 

 tate, an arcuate series of coarser punctures on each side of clypeus, a small 

 group within each eye. Thorax finely closely punctate, a little more coarsely, 

 less densely at the sides, the anterior arcuate and posterior oblique series of 

 coarse punctures well marked, basal marginal line entirely wanting. Elytra 

 striate, strife variable in depth of impression, the two inner and the scutellar 

 strife very indistinct at base, strife closely punctate, rather finely on the disc, 

 more coarsely at the sides, intervals flat, not densely punctulate, intervals 3-5-7-9 

 with the usual series of coarse punctures placed near the outer side of the re- 

 spective intervals, a less regular series between the tenth stria and the lateral 

 margin. Body beneath opaque black. Legs piceous, the tibite sometimes, the 

 tarsi always paler. Femora opaque, densely punctulate and pubescent, except 

 near the tip. Length .26— .32 inch. ; 6.5—8.5 mm. PI. iv, fig. 2. 



Prosternum not carinate, mesosternum obtusely elevated in a va- 

 riable degree. 



Tarsal claws simple, merely gradually broader at base. 



The most striking variation observable in this species is in the 

 form of the mesosternal protuberance being in some specimens well 

 marked and prominent, forming a distinct angle, while in others it 

 is so reduced as to be merely a slight longitudinal convexity. 



The general color of the species is piceous black, but specimens 

 occur with a slight seueous surface lustre, or even violaceous. The 



