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and did in fact publish one (Annals Ent. Soc. Amer., x, 23). 

 But after 1896 he did little work on the order except in prepar- 

 ing the third edition of his Manual, which cost him two years of 

 arduous work, as he drew 800 figures with his own hand. 

 His deep interest in genera and his very wide acquaintance 

 with them, together with his universally recognized taxonomic 

 ability, made him in the period 1890-1900 the peer of Osten 

 Sacken, Brauer and Mik as a world-authority in Diptera. 



The types of Williston's new species are much scattered. 

 His Syrphidae were acquired by the National Museum ; the 

 rest of his earlier collections by the University of Kansas ; 

 his Biologia material and that from St. Vincent went to Lon- 

 don, and 1 understand were finally deposited in the British 

 Museum; the American Museum of Natural History obtained 

 his later collections, including some duplicates of type series 

 from St. Vincent and perhaps Mexico. Williston did not be- 

 lieve in designating a single type specimen, hence in some cases 

 his types of the same species are in two museums. He had no 

 collection of Diptera in his last years, although he still re- 

 tained his fine library in the order. 



Although he never gave any formal entomological courses, 

 he gave informal and even more valuable assistance both in 

 Kansas and Chicago to several entomologists who were special- 

 izing on Diptera ; among them W. A. Snow. Hugo Kahl, 

 C. F. Adams, A. L. Melander and myself. We all admired 

 him, and our admiration grew into deep love and veneration 

 with the passing years. He had students outside of entomology 

 like E. C. Case and C. E. McClung, who achieved high scien- 

 tific standing. His lecture courses in palaeontology were full 

 of broad generalizations about evolution, and in the highest 

 degree stimulating and profitable to students with biological 

 training, as I am informed by Melander, who took them. He 

 did not have large classes at any time, and his lectures were 

 mostly informal in style, drawn from a rich experience and 

 given in intimate association with the student, the kind that 

 would make a deep impression. But his life work was mainly 

 directed to the larger circle outside his institution. 



