336 The Ohio Journal of Science [Vol. XVII, No. 8, 



The following key to the genus Passerherbiilus and the three 

 allied genera above diagnosed may serve to set forth more 

 graphically their distinguishing characteristics: 



fli. Exposed culman not decidedly less than middle toe without claw; exposed 

 culmen decidedly more than twice the height of bill at base; first 

 primary (counting from the outermost) shorter than the seventh 



Thryospiza. 



a^. Exposed culmen decidedly less than middle toe without claw; exposed 



culmen not decidedly more than twice the height of bill at base; first 



primary (counting from the outermost) longer than the seventh. 



6K Wing decidedly more than four and one-half times the length of 



exposed culmen; tail about equal to wing; first primary (counting 



from the outermost) longer than fifth Passerherbiilus. 



b-. Wing not decidedly more than four and one-half times the length of 



exposed culmen; tail decidedly shorter than wing; first primary 



(counting from the outermost) not longer than fifth. 



c^. Tail more than seven-eighths of wing; exposed culmen much less 



than twice the height of bill at base; height of bill at base 



about equal to length of gonys Nemospiza. 



C-. Tail not more than seven-eighths of wing; exposed culmen about 

 twice the height of bill at base; height of bill at base decidedly 

 less than length of gonys Ammospiza. 



Date of Publication, June 2, 1917. 



