PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued lm*\\ vl Q^Mi h l ^ e 



SMITHSONIAN INSTITUTION 



U. S. NATIONAL MUSEUM 



Vol.93 Washington: 1943 No. 3165 



NEW GENERA AND SPECIES OF BARK BEETLES OF THE 

 SUBFAMILY MICRACINAE (SCOLYTIDAE, COLEOPTERA) 



Bv M. W. Blackman 



In a series of three earlier papers 1 the writer revised the bark 

 beetles of the subfamily Micracinae of the United States, described 

 4 new genera and subgenera and 25 new species, and presented keys 

 to the genera and species. In the present paper 2 new genera and 

 16 new species are described. Of these 1 genus and 11 species are 

 from continental United States, while 1 new genus and 5 new species 

 are from the West Indies, Colombia, and Mexico. 



The subfamily Micracinae is a rather small one containing rela- 

 tively few known genera, and with the exception of Hylocums Eich- 

 hoff no genus contains more than 10 known species. Specimens of 

 Micracinae are usually not numerous in collections. This is due in 

 part to their small size and to the inconspicuous work of representa- 

 tives of such genera as Pseudothysanoes Blackmail, Cryptocleptes 

 Blackman, and the new genus from the continental United States 

 described in this paper, which breed in the bark of dying or dead 

 twigs of hickory, oak, acacia, and other deciduous trees and shrubs, 

 and in other cases to the very secluded life of such lignivorous forms 

 as Hylocurus Eichhoff, Micracis LeConte, Micracisella Blackman, 



1 Mississippi Agr. Exp. Stat. Techn. Bull. 9, pp. 1-62, 1920 ; New York State Coll. Forestry 

 Techn. Publ. 16, pp. 142-148, 1922 ; New York State Coll. Forestry Techn. Publ. 25, pp. 185- 

 208, 1928. 



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