OF WASHINGTON. 271 



JANUARY 7, 1892. 



The seventy-seventh regular meeting and the seventh annual 

 meeting. 



President Marx in the chair. Eighteen members and two vis 

 itors present. 



The election of officers for 1892 resulted as follows : President, 

 C. V. Riley ; Vice-Presidents, C. L. Marlatt and W. H. Ashmead ; 

 Treasurer, E. A. Schwarz ; Recording Secretary, Nathan Banks ; 

 Corresponding Secretary, L. O. Howard ; Executive Committee, 

 W. H. Fox, Geo. Marx, and B. E. Fernow. 



The retiring President, Dr. Marx, delivered his Annual Ad 

 dress : 



ANNUAL ADDRESS OF THE PRESIDENT. 



ON THE MORPHOLOGY OF THE TICKS. 

 BY GEORGE MARX, M. D. 



While studying the natural history of the Cynorhcestea* which 

 had come under my observation during the last few years, and 

 searching the European and American literature for some points 

 on the morphology of these interesting parasites, I noticed that 

 the views of the various writers conflicted widely, and, judging 

 from the unscientific and 'indefinite descriptions of the new 

 species, I soon became convinced that our knowledge of the ex 

 ternal anatomy of this group of Acari was by no means a perfect 

 one. 



The treatment of our indigenous species by American ento 

 mologists has hitherto been confined to the description of twenty- 

 three new species, f 



* See the author's article : Note on the Classification of the Ixodidse, 

 Proceed. Entomol. Society of Washington, Vol. II, No. 2, p. 232. 



f Say, in 1821, describes eight species in Proceed. Ac. Nat. Sc., Phila 

 delphia, Vol. II, p. 19. 



Packard, 1869, published ten descriptions in First Annual Report Pea- 

 body Academy, p. 65 ; 



Riley, in the same year, one species in Report of Commissioner of Agri 

 culture on Diseases of Cattle, p. 118; 



Fitch, in 1870, four species in the i4th Rep. of the New York State 

 Agricl. Society. 



