88 GEO. H. HORN, M. D. 



In four species the imperfect form of the male has alone been seen 

 {floridnnum, aiiceps, Ivguhre and obh'qnum) and from the fact that the 

 complete form is very much more abundant than either of the others in 

 the species in which it occurs, it is possible that those above enumerated 

 have no other form of male. 



Reasoning deductively we might be safe in asserting that what is men- 

 tioned above as a supposition is a fact. If we except this* as true then 

 we have all the probable combinations of the foveae, lobe and emargina- 

 tion in the males and our series of species may be considered structurally 

 a perfect one. 



The following table will enable our species to be separated : 



Third ventral segment 9 with a fovea or short transverse plica very near its 



centre 2. 



Third ventral J absolutely simple 4. 



2.— Abdomen of uniform color, brown or pi(>eous. 3. 



Abdomen bicolored, piceous with last two segments rufo-testaceous ; meso- 



metathorax piceous 7. Iiieolor. 



;i.- Third and fourth ventral segments '^ each witli a well-inarkcd transverse 



plica 2. floridaniiiii. 



Third segment witli a j)lica, fourth with a puncture. 



Head not conspicuously coarsely punctured, punctures of elytra close and 

 confused; third joint of antennas conspicuously longer than tlie second. 



Larger species .40-. 60 inch 1. l»a<liiiin. 



Head relatively coarsely punctured, punctures of elytra coarse, and in dis- 

 tinct striiie; third joint of antennse not longer than second. Small species 



.2fi inch '). Iii^^iihro. 



4. — Abdomen bicolored. 



Last two segments paler. 



Meso-metathorax and head rufo-testaceous '.). texaiiiiiii. 



Meso-metathorax and head piceous s. carol in mil. 



Last two segments piceous, the others rufo-testaceous 14. vitaSiiiii. 



Abdomen uniform in color, Ijrownish testaceous, piceous or almost black 5. 



.1. — Head gradually narrowed behind the eyes, the hind angles scarcely evident; 



elytral punctures substriate 6. obliqiiiim. 



Head parallel beliind the eyes, the angles broadly rounded; j>unclures of 



elytra confused C>. 



6. — Abdomen piceous 7. 



Abdomen rufo-testaceous not differing from the thorax and elytra 8. 



7. — Entire body above and beneath piceous, almost black. 



Head opaque, moderately densely punctured; elytra densely punctured. 



Species small .28-.30 inch 4. despectiiiii. 



Head shining, rather sparsely punctured ; elytra coarsely not densely punc- 

 tured. Species large and robust .44 inch 3. anceps. 



Head, thorax and elytra rufo-testaceous or pale castaneous. 



Surface shining punctuation of head and thorax normally distinct, that of 



the abdomen very indistinct 15. ventrale. 



Surface subopaque, punctuation of thorax feeble, that of the abdomen 

 rather coarse and distinct II . vagiiiil. 



