634 DB. P. CHALlilERg MITCHELL ON THE [Dec. 17, 



Text-fig. 72. 



Wing-structure of Otis tarda. 



Diagram of the distal secondary quills and coverts, showing the diastataxic 



condition. General description and lettei'ing as in text-figure 70. 



PL. Plica, or membranous fold binding the carpal remex to the distal secondary. 



Text-fig. 73. 



Wing-structure of Ehinochetus juhatMS. 



Diagram of the secondary quills and coverts, showing eutaxic condition. 

 General description and lettering as in test-figure 70. 



