H. C. FALL. 175 



to be identical. If I am correct, Mr. Schaeffer's specimens of 

 bisig?iahis, which he says do not differ from exigims, must be 

 incorrectly determined. In my pair the antennae of the male 

 are much longer and stouter, joints 1-4 and the terminal 

 joint pale. The eleventh joint is wanting in the female, but 

 is probably colored as in the male. Horn describes the an- 

 tennas as black with basal joints rufous. 



B. floridae Horn. 



The type of this is strikingly suggestive of exiguus, and it 

 may be an unusually large example of the latter with two in- 

 stead of the typical three denticles on the hind femur. A 

 further careful comparison with typical exigzms is necessary 

 before pronouncing them the same. 



B. griseolus n. sp. 



Moderately robust, rufotestaceous, lower surface darker rufous or 

 picescent except posteriorly, antennae and legs entirely rufous ; pubes- 

 cence rather dense, uniformly yellowish-gray. Antenna? not conspicu- 

 ously incrassate externally, joints 6-10subequal in width and all nearly 

 or quite as long as wide. Eyes moderately prominent, front slightly 

 wider than the ocular width, scarcely or feebly carinate, closely finely 

 punctate, occiput with piceous shade at middle. Prothorax wider 

 than long, sides broadly arcuately convergent from base to apex ; sur- 

 face moderately coarsely not closely punctate. Elytra as wide as long, 

 sides distinctly divergent posteriorly; striae fine, obsoletely punctate, 

 intervals flat without distinct sculpture ; humeral callus slightly or 

 distinctly darker, suture and side margin sometimes narrowly dusky. 

 Hind thighs rather stout, armed on the inner edge near the tip with a 

 long acute tooth and two rather strong denticles approximate to the 

 tooth. Hind tibia finely carinate externally, apical spur nearly half as 

 long as the first tarsal joint. Length, 2.5-2.8 mm. ; width, 1.5-1.7 

 mm. 



Described from seven examples taken by Dr. Fenyes at 

 Yuma, both on the Arizona and California sides of the river. 



This species would by Horn's table come next to uniformis, 

 but the prothorax is wider with sides more arcuate, scutellum 

 less elongate, pygidium less oblique, not bi-impressed at 

 apex, last ventral shorter, tibial spur much longer. The 

 pubescence is perfectly uniform in color and density through- 

 out. 



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



