732 The Smithsonian Institntion 



The Diptera also early received attention. A provi- 

 sional " Catalogue of the described Diptera of North Amer- 

 ica," by Baron Robert Osten-Sacken (1858), was replaced 

 twenty years later (1878) by an enlarged and critical cata- 

 logue bearing the same title. 



A series of " Monographs of the Diptera of North Amer- 

 ica " was next provided for, and edited by Baron Osten- 

 Sacken. Four of these were published, of which the first, 

 second, and third were by Doctor H. Loew of Meseritz, 

 Prussia, and the fourth by Baron Osten-Sacken. The first 

 (1862) gives a sketch of the systematic arrangement of the 

 Diptera, and monographs of the North American Trypetidae, 

 Sciomyxidae, Ephydrinidae, and Cecidomyidae (the last by the 

 editor); the second (1864) is confined to the family Doli- 

 chopodidae; the third (1873) treats of the family Ortalidae ; 

 and the fourth (1869), of the North American Tipulidae. 

 Long afterward, in 1886, a monograph or "Synopsis of 

 the North American Syrphidae," also an important family, by 

 Professor Samuel W. Williston, was published as a bulletin 

 of the United States National Museum. 



Another series of lists of species, with references to one or 

 more of the descriptions of each of the species, was also pub- 

 lished. Several orders of insects were thus catalogued, the 

 Diptera by Baron R. Osten-Sacken (1858 and 1878), the 

 Lepidoptera by Doctor John G. Morris (i860), and the Or- 

 thoptera by Doctor Samuel H. Scudder (1868). 



MYRIAPODS 



The so-called Myriapoda form a heterogeneous though gen- 

 erally recognized group which has been much neglected till 

 recent years. A young student, Charles H. Bollman, who 

 had been trained under the auspices of Doctor David S. 



