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separate the southern unicolor from all those varieties. And 

 here let me remark, incidentally, that I never saw or heard of a 

 black variety, or of the obscure, in either of these localities. It 

 is easier to perceive than to describe the difference between these 

 varieties of rue/if rons and the southern unicolor. The latter was 

 taken at St. John's Bluff, East Florida, in February, 1838, by 

 my lamented friend Mr. Edward Doubleday, who kindly pre- 

 sented two specimens to me. The unicolor referred to is abso- 

 lutely immaculate, not a vestige of white being upon the elytra. 

 The color is more blue than green, with a beautiful purple 

 or reddish reflection on the elytra. Size smaller than rugi- 

 frons ; thorax more smooth ; elytra more convex, and more 

 rounded at the humeral angles and tip. Head rather smaller 

 than that of ritgifrons, etc. Indeed, I cannot amend Dejean's 

 description, which seems well to characterize my specimens, 

 except that he does not notice the purplish reflections of the 

 elytra. The whole surface has a smoother and more satiny 

 lustre than rugifrons. All these, I admit, are on paper slight 

 distinctions ; but were you to see the specimens side by side 

 with rugifrons^ I think the differences would strike you as they 

 did both Doubleday and myself. 



Of tortuosa I have four specimens, also taken by Mr. 

 Doubleday in Florida, and no two of them are marked exactly 

 alike. There is some disparity in size in the two sexes, but the 

 males are not proportionally much narrower than the females. 

 They are more densely punctured than punctulata, but the 

 punctures are not confluent. In one $ , the terminal lunule 

 consists of a nearly straight white line along the hinder slope 

 of the elytron, slightly enlarged at the tip. In a female, 

 this same line is a little enlarged at both ends. In a second 

 male, the line is enlarged at tip and refracted at a right angle 

 from the other end, and almost tmited there with a white spot. 

 In the other female the union is complete, the terminal line 

 forming a kind of hook at the anterior extremity. The thorax, 

 I should think, might be called subtilissime ruyoso ; perhaps you 



