NORTH AMERICAN COLEOPTERA. 79 



C. soror Lee. — Tliis is a little sniootlier and more slender, the 

 thorax more decidedly narrowed at base, the elytral costae without 

 being much elevated are more distinct for a greater length. 



(J. Lesueuri Lap. et Gory. — In this form, which resembles soror in 

 shajie, the elytral sculpture is quite sharply indicated and the costae, 

 foveas and more densely punctured intervals are well limited. The 

 foveae are especially sharply defined and are usually more golden in 

 color. 



C. nigritula Lap. et Gory, (ohscura Lee.) — Form slender, rather 

 more acutely narroAved posteriorly, the surface more greenish from 

 the color of the punctures and the sculpture even more confused than 

 in Alabamce. 



C. misella Lee. — This form is founded on small and imperfectly 

 developed specimens and from their sculpture and general appear- 

 ance should be referred to the variety femorata. 



Other variations will be observed in the color of the under side of 

 the body from brassy to cupreous and green, but as these are so com- 

 mon everywhere in the Buprestidee it is merely necessary to indicate 

 their occurrence. 



As already remarked the species has a very wide distribution. It 

 occurs in Canada and in every State and territory in the United 

 States and extends into Mexico. 



Group III. 



The group here suggested consists of species of at most moderate 

 size, without very conspicuous or well defined elytral sculpture. The 

 thorax has a rather feeble median impression, almost Avanting in 

 ignicollis and contigua, being therefore intermediate between the spe- 

 cies of the first group and those aggregated around trinervia. The 

 last ventral segment has a serrate margin. The essential character 

 of the group is found in the anterior tibia of the male, which has an 

 acute tooth (in contigua obtuse) usually one-third from the apex, 

 although in speculifer and virldicyanea it is very close to the apex. 



The following table gives, in brief, the characters separating the 

 species : 



Clypeus acutely incised at middle, dentate each side. 



Clypeal teeth well marked ; tooth of anterior tibia % rather broad, not veiy 



acute at tip - 8. contigua. 



Clypeal teeth scarcely prominent; tooth of anterior tibia male acute and 

 prominent 9. cuprascens. 



