274 ENTOMOLOGICAL NEWS. [Oct., '06 



"Western Diptera," 1877, and "Catalogue of North American 

 Diptera," 1878. 



It is indeed fortunate that such an able, generous, self-sacri- 

 ficing man, having always the interest of American Dipterology 

 at heart, should have taken up the study of this neglected order. 

 In his co-operation with Loew he had an understanding that all 

 species described by him should eventually be returned to the 

 United States. This scheme, he says, "enabled me to receive 

 without stint the numerous contributions in collections and 

 specimens which were most generously put at my disposal by 

 different collectors during my long residence in the United 

 States." In 1877, owing to Loew's rapidly declining health, 

 Osten Sacken attended personally to the transfer of the col- 

 lection to Cambridge. This collection contained about 1300 

 species described by Loew, 330 identified by him, and about 

 1 200 unidentified species; combined with Osten Sacken's col- 

 lection, which comprises his types of Tipulidas, the entire col- 

 lection of Tabanid?e, Western Diptera, etc., makes a total of 

 about 1800 determined species. 



Since 1877 Baron Osten Sacken made his home in Heidel- 

 berg and continued his studies of the Diptera, publishing 

 numerous papers, including "Enumeration of the Diptera of the 

 Malay Archipelago," etc., 1881 ; "An Essay of Comparative 

 Chsetotaxy," etc., 1881, revised in 1884; "Diptera from the 

 Philippine Islands," etc., 1882; "The Diptera Orthorrhapha" 

 in "Biologia Centrali-Americana," 1886; "Studies on Tipulidae," 

 pt. I, 1886, pt. 2, 1887; On the Characters of the Three Divis- 

 ions of Diptera : Nemocera vera, Nemocera anomala and Ere- 

 mochaeta, 1892 ; On the so-called "Bugonia" of the Ancients, 

 1893, revised in 1894, with additional notes in 1895 ; "Record 

 of my Life-work in Entomology," pts. I, 2, 1903, pt. 3, 1904. 

 His entomological publications in all number 179, and he 

 described over 360 species of North American Diptera, and 

 about 100 from the Malay Archipelago, Philippines, etc. 



Baron Osten Sacken possessed what is so frequently wanting 

 in scientific men, a thorough mastery of details, undoubtedly an 

 inborn characteristic, which stood by him to the last and enabled 



