limited genus ; Fabricius described three species 

 in his last work on insects of this order, two 

 from Sumatra under the names of Trogosita 

 elongata and Jiliformis, and the other from 

 North America, under that of Trogosita bico- 

 lor. He perceived that they did not altogether 

 correspond with the other species of the group 

 to which he referred them, for when describing 

 the latter species, he expressly states, that in its 

 elongated and cylindrical appearance it differed 

 from Tenebrio, and that it ought perhaps to 

 form a distinct genus. Latreille finally estab- 

 lished a genus under the name we have adopted, 

 in his " Histoire Naturelle des Crustaces et 

 Insectes," for the reception of the bicolor. In 

 his " Genera Crustaceorum et Insectorum," he 

 described another species under the name of L. 

 mozardi; and in the pages of the " Journal of 

 the Academy of Natural Sciences of Philadel- 

 phia," I increased the number to six, by the 

 publication of two new species. 



PLATE 39. 



