652 Goleoptei^ological Notices, VI. 



and the oi'gan there alluded to is probably the mobile efferent duct 

 bent downward from the protecting corneous sheath. 



1. M. formicariiis Laf. — Mon., p. 185; Lee: Proc. Ac. Nat. Sci., Phila., 

 ]H52, p. 1)7; cindus var. A, Say: Journ. Ac. Nat. Sci., Phila., 1819, p. 278 

 (Aiithicus). 



Moderately stout, highly polished, black, the bases of the pro- 

 thorax and el^^tra feebly rufescent ; sterna and antennae toward 

 base, rufo-testaceous ; legs blackish, the tarsi and base of the 

 femora testaceous. Head subimpunctate, rather longer than 

 wide, semi-circularly rounded behind the ejes, which are moderate 

 in size and rather prominent ; occiput with a foveiform impression 

 at the middle of the base ; antennae long, distinctly and gradually 

 incrassate, the tenth joint slightly longer than wide, the third and 

 fourth elongate and subequal. Prothorax much longer than wide, 

 distinctl}' narrower than the head, globularly convex before the con- 

 striction and expanded toward base,the punctures minute and verj^ 

 remote, except in the middle toward base,where they become larger, 

 dense and distinct. Elytra almost twice as long as wide, feebly 

 dilated behind, about two and one-half times as long as the pro- 

 thorax, the scutellar impression deep, the omoplates prominent ; 

 disk scarcely visibly impressed near the base, but having a trans- 

 verse and well defined ^^ellow band at basal fourth interrupted 

 at the suture ; punctures coarse and sparse from the base to about 

 the middle, thence gradually very fine and remote to the apex, 

 the pubescence short, stiff", semi-erect and remote, with erect 

 widely dispersed bristles intermingled. Abdomen shining and 

 sparsely pul»escent. Length 8.0-3.5 mm., width 0.8-1.0 mm. 



Rhode Island to Iowa. The type above described is a male 

 from the shores of Narragansett Bay, and diflTers slightly from 

 some of the western specimens in its smaller size, rather narrower 

 head and sparser punctuation. 



The redeagus of this species is very complex. The genital 

 segment is short and simple, with a rounded shallow sinuation at 

 the middle of the apex subequal in extent and degree of curva- 

 ture to the lateral lobes. The ert"erent duct is extremely long 

 and slender, lying in the wide deep inferior opening of a long 

 broad sheath, which is parajlel-sided and flattened dorsalh^ for 

 the greater i)art of its length, but narrowed near the apex, 

 where it becomes split into three lobes of equal length, the 

 two lateral hollowed intornally and finelv setose within at 



