()6 GEO. H. HORN, M. D. 



The types of the species described by Melsheimer were obtained 

 by the Museum of Comparative^ Zo()h)gy at Cambridge, and for a 

 long time were loaned to Dr. LeConte, many of them still remaining 

 in his cabinet, now part of that Museum. 



The species described by other authors anterior to the " Revision" 

 are fcAV in number, and fortunately definitely known. Typical s])eci- 

 mens of all the species described by LeConte are, with one exception, 

 in his cabinet. 



The few inunediately preceding remarks indicate the authority for 

 the names which will be used for the sj^ecies in the f )llowing ])ages, 

 while the work itself is based on an aggregation of material which 

 it would be impossible at the ])resent time to equal. 



During his life-time LeConte's cabinet and my own were used in 

 conunon with the result of making them similar in the names of the 

 species and by interchange of specimens as nearly equal as possible 

 in numbers. I have already remarked that close monographic study 

 usually develops previously unnoticed characters, and, as will be ob- 

 served in the following pages, the exact definition of several of the 

 species became somewhat uncertain. A renewed study of many of 

 LeConte's types became necessary, and fi)r this possibility I must re- 

 turn my thanks to the jMuseum of Comparative Zoology for the 

 freedom with which they have permitted me to use not only these, 

 but also all other material in their possession. The series in the 

 National ^Museum at Washington has been kindly loaned me. 



Among the personal friends who have assisted me by the loan of 

 their entire collections Mr. Ulke, of Washhigton, requires sj)ecial 

 mention, his series being very full and his specimens the perfection 

 of neatness. 



To Messrs. Edwards, Angell, Merkel and Reinecke, of New York, 

 Fuller, of New Jersey, Pergande and Lugger, of Washington, Hen- 

 shaw, and Blanchard of Massachusetts, Wilt and Wenzel, of this 

 city, I am also indebted for the loan of smaller series which have 

 been useful in their aggregation by indicating points of distribution 

 not otherwise known. My own cabinet contains all the species with 

 one exception. 



Regarding the number of specimens examined — of thirty-three 

 species, I have seen ten and over, in many cases hundreds, seven 

 with five or six, five with three or four, one with two, while four only 



