2 ' NORTH AMERICAN 



For the groat mass of material which lias heen under examination, 

 amounting in all to nearly two thousand specimens, I am indebted 

 first to Messrs. E. A. Schwarz and II. G. Hubbard, who kindly placed 

 their entire collection at my disposal. This is a most surprising ag- 

 gregate of these small insects, collected mainly in the Lake Superior 

 Region ; also at Detroit, Mich., Cambridge, Mass., at various points 

 in the Peninsula of Florida, at Columbus, Texas, and in Colorado ; 

 besides others in the same cabinet collected by Mr. Morrison in the 

 Lake Tahoe Region of Nevada, and in Washington Territory. Pro- 

 bably four-fifths of the entire number of species here described are 

 due to the scientific collecting of these Coleopterists. I am also greatly 

 indebted to the late Dr. J. L. LeConte, who, a short time before his 

 death, placed his entire set of this tribe in my hands. This collection 

 is made up principally of a considerable series of specimens, collected 

 by the late Mr. G. R. Crotch in widely separated points of California, 

 in British Columbia, and in Vancouver Island, and also contains 

 larse donations from the cabinet of Messrs. Hubbard and Schwarz. 

 as well as a smaller number gathered together from other sources. 



To Mr. J. Pettit, of Grimsby, Ontario, I owe my best thanks for a 

 large collection in alcohol, made by himself in that part of Canada 

 immediately about his home ; and I am also under obligations to Dr. 

 G. II. Horn, of Philadelphia, and Mr. C. V. Riley,' of Washington, 

 for small sets of specimens, being all that their cabinets chanced to 

 contain at the time. 



In conclusion, I cannot fail to express my thanks to M. Aug. Salle, 

 of Paris, for a type collection of the more common European species 

 with which that distinguished entomologist most kindly answered my 

 request ; they have been of great use in determining the identity of 

 several species. 



It will be seen, upon consulting the map of North America, and 

 noting the several localities given above, that the extensive region 

 about the Great Salt Lake, and thence stretching in a broad belt, em- 

 bracing Lakes Winnipeg, Athabaska, and Great Slave, as well as 

 the entire region of Labrador about Hudson's Bay, and the Missis- 

 sippi Valley from the source of the river to its mouth in Louisiana, 

 are almost wholly unrepresented in the collections which are before 

 me. As it is apparent that a large number of species are quite local 

 in habitat, many new ones will undoubtedly be brought to light when 

 these vast regions are sufficiently explored. Until they shall have 

 been collected over, it must be quite useless to treat exhaustively of 

 geographical distribution. It may be stated, however, that, as a rule, 



