ADDENDA 287 



traceable as series of extremely minute feeble punctulation; inflexed 

 sides finely tristriate; prosternal lobe finely, closely and deeply 

 punctate, finely margined at apex, more broadly laterad, the pro- 

 sternum along the middle strongly convex; mesosternal sinus rather 

 feeble. Length 6.6 mm.; width 4.7 mm. Pennsylvania. 



incertus Mars. 



Propygidium with strong, sparse and subevenly distributed punctures; 

 body much smaller in size; third discal stria attaining the basal 

 margin or very nearly. Broadly rounded, highly polished; three 

 discal striae smooth, moderate, the fourth a short and fine incised 

 line before the middle and, as usual, well removed from the base, the 

 sutural abruptly ending at basal fifth or sixth and apical eighth; 

 humeral represented by a long obsolescent series of fine feeble punc- 

 tures, the subhumeral wanting; inflexed sides tristriate; pygidium 

 convex, very minutely, remotely punctulate throughout; prosternal 

 lobe nearly as in incertus; mesosternum feebly sinuate. Length 

 4.7-4.85 mm.; width 3.7-4.0 mm. Alabama (Mobile). 



orbiculus n. sp. 



A Body throughout nearly as in orbiculus, but slightly less broadly 

 rounded, and with the fourth discal stria longer, extending from 

 near the base to behind the middle, the sutural also longer than 

 in any other of this section, extending from near the apex almost 

 to the base, where it is more or less bent outward; on the disk, 

 just within the anterior end of the fourth discal stria, there is a 

 small diffuse fovea; transverse distance between the fourth and 

 sutural striae less than in orbiculus. Length 4.5 mm.; width 3.5 

 mm. Mississippi (Agricultural College), H. E. Weed. 



fretus n. subsp. 



In nitens, the prosternal lobe is obtusely rounded at apex in one 

 sex and abruptly transversely truncate in the other. The pro- 

 pygidial sculpture of incertus differs markedly from that of any other 

 form above mentioned, and the striation of nitens is wholly peculiar 

 to itself. Fretus and subinteger are only provisionally assigned 

 subordinate rank, because of the lack of confirmatory material. 



The species of the merdarius section of that group, are rather 

 narrowly oblong-oval in form and of very moderate size as a rule, 

 but never so small as the broadly oval and more convex stygicus. 

 They are rather numerous but individually rare, as stated by 

 Marseul of the European merdarius. That author confused several 

 exotic species with merdarius, among others the American mem- 

 nonius of Say, which differs in having the fourth discal stria much 

 more abbreviated at base and the very coarse propygidial punctures 

 sparse, and not "assez serres" as stated of merdarius. So far as 

 represented in my collection our species of this section may be 

 differentiated among themselves as follows: 



