270 GEO. H. HORN, M. D. 



B. Mrticse Fab. — Oval, convex, piceous with slight seneous tinge, surface 

 shinint;; and very sparsely pubescent. Head coarsely and moderately densely 

 punctured. Antennae rufous. Thorax nearly twice as wide as long, convex, 

 coarsely and moderately densely punctured, sides arcuate and slightly simiate 

 in front of hind angles. Elytra a little more coarsely but rather less densely 

 punctured than the thorax, longer than wide conjointly, apices truncate. 

 Abdomen above sparsely obsoletely punctured. Prosternura coarsely and 

 densely punctured, metasternum sparsely punctured, abdomen more distinctly 

 punctate. Legs rufous. Length .08 inch; 2 mm. 



The male has a very distinct terminal dorsal segment beyond the 

 pygidiura. 



The sinuation of the thorax is by no means very evident but may 

 be perceived by careful looking. 



Occurs in the Atlantic States, probably introduced from Europe. 



B. troglodytes Murr. — Very closely resembling urticcE but is a little more 

 coarsely sculptured, and the sides of the thorax are not sinuate. The apices 

 of the elytra are very squarely truncate. Length .08 inch; 2 mm. 

 Widely distributed in maritime California. 



B. globularius Murr.— Resembles the two precedingbut is a little larger, 

 the sculpture less evident and the pubescence faint. The sides of the thorax 

 are not sinuate and the apices of the elytra less squarely truncate. Length 

 .09 inch; 2.25 mm. 



Although very closely allied to the two preceding the species seems 

 suiEciently distinct, rather from its general appearance than from the 

 possibility of assigning any very definite characters to it. 



Occurs in Colorado and Mexico, Mr. Murray says from Connecticut 

 also, but I doubt the correctness of this statement. 



CERCUS Latr. 



The characters of this genus are given in detail in the books and 

 do not require repetition. Certain matters however, appear to have 

 escaped notice and deserve especial mention. 



All authors who have had occasion to study Cercus, are in accord 

 in being unwilling to assign the additional segment to the male. 

 This is certainly incorrect in our species and probably also in all. 

 The pygidium of the male is distinctly truncate and an additional 

 segment is quite as apparent as in Aviartus. In the female the 

 pygidium is oval at tip and has a submarginal impressed line around 

 the entire apical border. This line is interrupted at the middle or 

 truncate portion of the pygidium of the male. Accompanying this 

 sexual character is another in the form of the thorax. The males of 

 two of our species have the hind angles of the thorax obtuse or 

 even rounded, while in the females the sides of the thorax are 



