II A REVISION OF THE AMERICAN GENERA OF THE 

 TENEBRIONID TRIBE ASIDINI. 



In publishing the following study, it is primarily with regret 

 that so many of the described species are still unknown to me. 

 After using every endeavor to bring together as full and repre- 

 sentative a series as could be obtained, through the generous and 

 substantial aid of several well-known collectors, I find quite a 

 number of the aberrant forms described by LeConte and Horn 

 still missing, and the proper assignment of these species in the 

 taxonomic scheme here proposed has in many instances been 

 largely a matter of inference; but it is hoped, at any rate, that the 

 original descriptions of these desiderata, which are given in nearly 

 every instance, may render this revision at least of some utility in 

 bringing these scattered descriptions together for convenient refer- 

 ence. Although actually numerous, the number of missing species 

 is however proportionally very small, for in the following pages 

 212 species and subspecies are listed, excluding 10 described from 

 Mexico, of which only 60 species and subspecies, known and un- 

 known to me, had been previously described, an increase of about 

 three and one-half fold. Those still unknown to me in nature 

 will probably remain so for many years, owing to their extremely 

 local range and the exceptional rarity of most of them; the type 

 of Micro schatia sulcipennis, for example, has remained a unique 

 since it was originally described about half a century ago. 



In the Asidini the body is large to moderately small in size and 

 with great variety of sculpture, from amost perfectly smooth to 

 very rough; the elytra are frequently costate and the integuments 

 often coated with so dense a crust of earthy matter that it is im- 

 possible to remove it, this crust really becoming almost a part of 

 the integument, through which the short bristles protrude regularly 

 and without detriment to their tactile function. The head is 

 inserted to the eyes, which are very transverse, more or less coarsely 

 faceted and generally convex; but they may become nearly flat 

 and extremely short as in Pycnonotida, and, in the convexicollis 



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