Sept., I9I7.] Fall: New Dytiscid.^. 163 



1903. HiNE, James S. Tabanidse of Ohio. Ohio State Academy of Science, 



Special Papers, No. 5. 

 1906. HiNE, J. S. Habits and Life Histories of Some Flies of the Family 



Tabanidse. U. S. Dept. of Agric, Bureau of Entomology, Tech. 



Sen No. 12, Part II., pp. 19-38. 

 1913. Patton, W. S., and Cragg, F. W. Textbook of Medical Entomology. 



Christian Literature Society for India. London, Madras and Cal- 

 cutta. 

 1915. Neave, S. a. The Tabanidse of Southern Nyasaland, with Notes on 



their Life Histories. Bulletin of Entomological Research, Vol. S. 



Part 4, pp. 287-320; 4 plates. 



NEW DYTISCID^. 



By H. C Fall. 

 Pasadena, Cal. 



By way of preface, it may be said that the present contribution is 

 the result of a conversation not long since with my long-time friend 

 Mr. John D. Sherman, Jr., at his home in Mt, Vernon, N. Y. Mr. 

 Sherman, as is well known to most coleopterists, has for many years 

 collected and otherwise accumulated North American Dytiscidse, of 

 which family he doubtless now possesses the largest and richest 

 material to be found in any American collection. 



In view of the proposed new check list of Coleoptera, Mr. Sher- 

 man expressed the opinion that a number of the more distinct new 

 species ought to be at once described, and suggested that I undertake 

 the task. After some hesitation I agreed to make the effort and soon 

 received from him a box containing good series of thirteen new 

 species, of which he wrote : " These are sufficiently distinct, I be- 

 lieve, to be safely described without monographic work." To these 

 I have added a number of others from my own collection, and a 

 little later, when there shall have been time for further investigation, 

 I hope to have something further to add concerning some more ob- 

 scure forms. 



Since the appearance of Dr. Sharp's monumental work on the 

 Dytiscidae — now thirty-five years ago — very little has been written 

 concerning our own species of the family. Notwithstanding the great 



