-25- 



known also from Ohio. 



The genus has been treated recently by Flint (1972 for those 

 in Neotropical areas of Mexico and Central America; by Denning and 

 Blickle (1972) mainly for species of America north of Mexico. In 

 the first paper the genus Metrichia Ross is placed as a subgenus of 

 Ochrotrichia . The former paper included keys to species , a check 

 list and descriptions of new species. There is a total of 45 spe- 

 cies, descriptions of 21 new species and a discussion of the species 

 occurring in the area. The second paper is a review of known spe- 

 cies and description of 15 new entities. Thus 36 species are added 

 to the large genus, 28 in Ochrotrichia . The recently described 

 ones are included in the present key and list of North American 

 species. In this genus the claspers and 10th tergite are usually 

 as3nmnetrical. 



Text Figure II. 



Ochrotrichia ^ genitalia. Lettering used for ma- 

 jority of species, Ochr. alsea , lA lateral, IB 

 dorsal. Lettering used for shawnee group, Ochr. 

 shawnee, 2A lateral, 2B dorsal. Lettering used 

 for confusa group, Ochr . riesi , 3A lateral, 3B 

 dorsal. Smaller letters designations given to the 

 various processes A, B, C, D, E, F and H. 



