192 AMERICAN COLEOPTERA 



became apparent that the task was by no means an easy one, and 

 that a thorough study of types and comparison of specimens would 

 be necessary before anything could be accomplished. The work has 

 been a long one, and it has been thought best to publish the results, 

 which are offered in the following paper with the hope that some 

 assistance may be afforded thereby to those who may desire in the 

 future to study these small, but interesting insects. 



During my work upon this genus I have keenly felt the need of 

 assistance and advice from one, now removed from us, who was ever 

 ready with valuable aid and suggestions for those similarly engaged ; 

 a need that I fear will also be appreciated by those who use this 

 paper. No one can realize more fully than I the irreparable loss 

 which entomology has sustained by the death of Dr. George H. 

 Horn. 



I desire, however, to acknowledge the kind assistance that I have 

 received in many ways from numerous friends and correspondents, 

 which has added materially to whatever value my work may possess. 



My warmest thanks are due to .Mr. Samuel Henshaw, who, as 

 heretofore, has rendered me valuable aid. To him I am indebted 

 for a free use of the LeConte collection, for much assistance in 

 bibliographical work and for kind advice. 



Messrs. Frederick Blanchard, F. C Bowditch, H. C. Fall and 

 Charles Liebeck have kindly placed their entire material in my 

 hands for many months, thereby largely increasing the amount that 

 1 have had for study, while Messrs. W. H. Harrington, L. E. Rick- 

 secker, Henry Ulke, H. W. Wenzel, H. F. Wickham and 'Mrs. A. 

 T. Slosson have aided me by the loan and gift of specimens. To all 

 of these I would express my gratitude. 



To the American Entomological Society I am under great obliga- 

 tions for the loan of the material formerly in Dr. Horn's cabinet, 

 now a part of their collection ; a service that has been of great 

 value. 



I would also express my gratitude to M. Rene Oberthiir of 

 Rennes, France, who has kindly loaned me the types' of several 

 of the species described by Baron Chaudoir. 



To Mr. Theodore Pergande I am grateful for the determination 

 of the hosts of several myrmecophilous species. 



Lastly, I would express my thanks to my friend Mr. J. H. Emer- 

 ton for the use of his facile pencil and the care that he has taken in 

 the drawing of the figures. 



