I NEW AMERICAN SPECIES OF ALEOCHARIN^ AND 



Since publishing the last paper on new Myrmedoniids (Mem. 

 Col., I), I have carefully arranged all the Aleocharinae in my col- 

 lection and find many undescribed forms; these are defined in the 

 present paper. The material in my collection has been obtained 

 from many sources. That most expert of collectors Herbert H. 

 Smith, contributed a very large set of admirably perfect specimens 

 in all parts of the series, from the Catskill Mountains, and Prof. 

 H. F. Wickham and Rev. J. H. Keen have also sent me very full 

 sets, the former from various parts of the Rocky Mountain system 

 and Iowa, the latter from Metlakatla and Queen Charlotte Islands, 

 British Columbia. In addition, Mr. H. C. Fall many years ago, 

 gave numerous well mounted examples from southern California, 

 and others were sent me by Emil Brendel from Iowa, Norman 

 Criddle from Manitoba, C. F. Baker from California and Chas. 

 Dury from Cincinnati; these were augmented by occasional species 

 from numerous other collectors forming a goodly number in the 

 aggregate. Finally, I have myself collected them with assiduity 

 during the past quarter century in California, Texas and parts 

 adjacent, St. Louis, Vicksburg, maritime Virginia, in Rhode Island 

 and elsewhere, so that the material at hand can well be imagined 

 to be tolerably full. The present paper completes the description 

 of virtually all the species known to me from these sources. 



Including those now published for the first time and allowing 

 liberally for possible synonymy, there have been certainly many 

 more than a thousand Aleocharinid species described from nearctic 

 North America, and I am firmly convinced that this number rep- 

 resents less than a third of those inhabiting these vast regions, so 

 topographically and climatically varied. There are very few 

 identical with any occurring in the palaearctic regions, though many 

 that are obviously more or less closely allied therewith and con- 

 fused with them through haste or lack of discernment; and there 

 are equally few common to the Atlantic and Pacific regions of 



T. L. Casey, Mem. Col. II, August 1911. 



