NORTH ^.MKRK'AX COLEOPTERA. 281 



of an examination of the ujiper surface of the femora. The abdo- 

 men should be depressed, and care used to see that the elytra are in 

 a natural position ; otherwise the serration of the apices may escape 

 notice, and one may be deceived as to whether they are dehiscent at 

 suture or not. 



In the measurements that portion of the abdomen extending be- 

 yond the elytra is not included, and localities mentioned are those 

 from which I have seen examples. 



I wish here to exjDress my deep obligations to Dr. C. V. Riley, 

 through whom were placed in my hands, for examination and study, 

 the large collections of the U. S. National Museum ; to Dr. George 

 H. Horn, for advice and the loan of his material ; to Wm. Beuten- 

 miiller, for a fine series of serrnlati(-'< ; and especially to Prof. John 

 B. Smith, for advice and friendly criticism, and to whose facile pencil 

 the reader is indebted for the plates illustrating this paper. 



Were it not for one, horrdi, the species would divide very natu- 

 rally into two groups : those with the sutural angles of the elytra 

 rounded, and those with the angles evident and usually produced. 

 In the first section would be placed vittatus, sublineatus, einarginatux 

 and carolvmis, and in the second all the others. In horiiii we have 

 a species with the male going into the first, and the female into the 

 second group. Being unable to devise a better arrangement an in- 

 dependent group has been found for the odd species. 



The species may be groujied and tabulated as follows : 



Sutural angles of elytra rouucled in both sexes Group A. 



Sutural angles of elytra rounded in % , produced and strongly dehiscent in 9 • 



Group B. 

 Sutural angles of elytra distinct, frequently ])roduced, in both sexes- -Grovip C. 



Group A. 

 Femora of % not toothed. 



Size large; surface very shining : elytra with a bronze vitta vittatus. 



Femora of % toothed. 



Size large ; opaque, color dark olive : tooth prominent, oblique. 



sublineatus. 

 Size medium to small; surface black, frequently bronzed. 



Tooth strong, acute; sutural angles broadly rounded, apices not serrate. 



emargiuHtus. 

 Tooth weak ; sutural angles scarcely rounded, apices finely serrulate. 



carolinns. 



TRANS. AM. ENT. SOC. XXII. (36) AUGUST, 1895. 



