H. C. FALL. 173 



Scutellum as long as or longer than wide, antennae black with 

 basal joints pale ; eyes more deeply emarginate. 

 Form more robust, terminal spur of hind tibia short, first ventral 

 of c? unmodified. (Brownsville, Texas.) 



aequalis Sharp. 

 Form more elongate, terminal spur of hind tibiae moderate, 

 about one-fifth the length of the first tarsal joint ; first 

 ventral of d 71 flattened at middle, the flattened area mar- 

 gined with longer hairs. (Western United States.) 



aureolus Horn. 

 9. First ventral of cf prominently lobed posteriorly. 



Elytral intervals with a conspicuous series of coarser punctures, 



the striae also more strongly punctate. (Montreal, Can., 



Michigan, West Virginia, Arizona. ) ...perforatus Horn. 



Elytral intervals without obvious series of coarser punctures ; 



striae not distinctly punctate. (New Mexico.) 



lobatus n. sp. 

 First ventral of cf without lobiform prominence. 

 Hind femora with a series of three minute teeth at the middle of 

 the lower margin of the hind femora ; antennae of cT long 

 and more strongly serrate. (Western Texas). 



subserripes n.,sp. 

 Hind femora without teeth at middle beneath ; antennae of d" 

 moderate in length. 

 Form broader, more rapidly narrowed in front, first ventral of 

 cT nearly or quite unmodified. 

 Pubescence moderately dense, elytral intervals with an evi- 

 dent series of coarser punctures. (Southern Arizona.) 



fumatus Schf. 



Pubescence relatively sparse, elytral intervals without obvious 



series of coarser punctures. (Massachusetts, Michigan, 



Tennessee.) calvus Horn. 



Form narrower, more gradually attenuate in front ; first ventral 



of cf flattened at middle, the flattened area margined with 



longer hairs and with a small foveiform impression at base. 



Pubescence moderately dense, usually grayish. (Indiana to 



California.) fraterculus Horn. 



Pubescence dense, usually luteous or yellowish-gray. (West- 

 ern United States.) aureolus Horn. 



B. protractus Horn. 



Antennas of c? a little longer and stouter, last ventral 

 deeply and broadly concave. Spur of hind tibia? not appreci- 

 ably different from the other denticles of the tibial apex. 

 The very long last ventral is unique in our fauna. Described 



TRANS. AM. ENT. SOC, XXXVI. JULY, 1910. 



