174 AMERICAN COLEOPTERA. 



from Lower California, but known to me from the desert 

 region of Southern California and San Antonio, Texas. 



B. amicus Horn. 



The rather small flattened eyes constitute the most pecu- 

 liar feature of this species. The scutellum is very small, 

 relativery smaller, I think, than in any other species known 

 to me. The coarse punctures of the pronotum are much finer 

 and sparser than usual. 



B. prosopis Lee. 



This species agrees fairly well with the three preceding in 

 general form, and especially in the strongly oblique pygi- 

 dium, but departs from them and agrees with the great 

 majority of this group in having the head punctate and pubes- 

 cent throughout, the apical spur of the hind tibiae well de- 

 veloped and the basal joint of the hind tarsi more distinctly 

 arcuate. The scutellum is oblong, emarginate at apex, and 

 more elongate than in any other of our species. I am unable 

 to separate uniformis and desertorum from prosopis. They 

 agree in all essential characters, the former differing merely 

 in being nearly uniformly pale, and the latter in its smaller 

 size. All these forms were described at the same time by 

 LeConte, who remarks that they occurred together in the 

 Colorado Desert breeding in the pods of Prosopis and Strom- 

 bocarpus^ 



B. bisignatus Horn. 



The most important character of this specie — viz., the large 

 eyes and narrow front, are not alluded to at all by Horn in 

 his description. Two examples, o 71 and 9 , in my collection, 

 taken at Albuquerque, New Mexico, by Mr. Wickham, were 

 compared by me with Horn's type some years ago and found 



* It happens that the description of uniformis precedes that of pro- 

 sopis on the same page, yet I have chosen to use the latter name for 

 the species, as being more appropriate and because it describes the 

 usual form of the species. This course does no injustice to the de- 

 scriber, creates no confusion, and is a manifestly sensible one. I 

 realize, however, that sooner or later some one, staunch in his belief 

 that man was made for the Sabbath, will reverse the synonymy. 



