OF WASHINGTON, VOLUME XII, 1!)10. 137 



species from wheat which came from a mill in Detroit, Michi- 

 gan, but which had probably been shipped from elsewhere. 

 It was in this case associated with three or four other common 

 species. The source of infestation could not be learned, nor 

 do we know if the species is established so far north, although 

 such is probably the case. 



The genus Latheticns is readily separated from the two 

 common red Triboliums by its much paler color, which is yel- 

 low by comparison. It is perceptibly shorter than our native 

 L. prosopis Chttn., a trifle more robust, the thorax being a 

 little shorter, as are also the antennae. The eyes are strikingly 

 larger and the mandibles are less prominent, the inner tooth 

 being strongly developed. The following table is submitted 

 for the separation of the two species: 



TABLE OF LATHETICUS. 



Body four times as long as wide ; eyes narrower than canthi ; an- 

 tennas of moderate length; mandibles prominent with inner 

 tooth feeble. Southern California and Arizona... .prosopis Chittenden 



Body a little less than four times the width; eyes larger, wider 

 than canthi ; antennas shorter ; mandibles less prominent with 

 inner tooth stronger. Texas. Introduced oryzce Waterhouse 



This insect, L. oryzce, has a considerable literature for a 

 species which was not described until 1880. Seven references 

 are at hand, omitting mere catalogue lists. It is not possible 

 to foretell what will be its economic importance in the future. 

 It has shown its capability of holding its own with other flour 

 beetles like Tribolinm, as also with Rhizopertha, Calandra, 

 and Lcemophlceus, all grain feeders, is now becoming accli- 

 mated indoors, and probably will make its abode out of doors, 

 in tropical and semitropical regions such as are afforded by 

 Texas, portions of Kansas and Mexico, and other portions 

 of the South; hence it would not be beyond the bounds of 

 possibility for it to assume considerable economic interest in 

 America. 



