250 Journal Xew York Entomological Society. t^'oi- ^-^• 



and in these it is the four anterior legs that are most affected. In 

 general the variation consists in the extension of one of the colors in 

 those having some or all of the legs bicolored, but never in my 

 observation extends to a reversal of colors. For instance — it may be 

 assumed with tolerable certainty that a specimen having black femora 

 and red tibiae is not specifically identical with one having red femora 

 and black tibiae, though it might not be distinct from one having the 

 legs entirely red or entirely black. The color of the abdomen is of 

 decided value if used with caution. The size of the lateral black spots 

 varies considerably, but a species with abdomen normally immacu- 

 late, while it may sometimes show faint traces of lateral spots will 

 rarely if ever have them heavily marked. In the following table 

 care has been taken to recognize the more important color variations 

 either in the table itself, or by tabulating the species in more than 

 one position — or by indicating before each group those species which 

 in certain color phases would fall in a position other than that which 

 they occupy. 



Variations in sculpture within specific limits are inconsiderable 

 and will be referred to under those species in which it has been 

 observed. It may be here remarked however that in most species the 

 sides of the prothorax show a tendency to become more or less 

 narrowly substrigose or regulose and opaque along the margin, which 

 area may become much wider in some individuals or even in rare 

 instances involve the whole surface. Structural characters useful in 

 delimiting species are, aside from those offered by the male antennae, 

 almost wanting. The antennae of the male, more especially the first 

 two joints, show much diversity in form and offer specific characters 

 of the highest importance. The very large joint with claw-like 

 appendage, although really the third, will in the following pages be 

 referred to as the second, which to all appearances it seems to be. 



My grateful acknowledgments are due to Prof. H. F. Wickham, 

 Mr. Chas. Liebeck, Mr. W. Kraus, Mr. Chas. Schaeffer, Mr. L. E. 

 Ricksecker, Dr. F. E. Blaisdell, Dr. A. Fenyes, ]\Ir. C. A. Frost, Mr. 

 A. B. Wolcott and Dr. Henry Skinner for assistance offered in the 

 way of specimens kindly sent for examination during the progress 

 of the work. According to the prevailing color scheme our species 

 may be arranged in three groups, as follows. 



