1893-] ENTOMOLOGICAL NEWS. 315 



America," written at the special request of, and published by the 

 Smithsonian Institution in 1861 ; palaeontological papers on 

 European fossil and amber insects. But the greatest monument 

 to his labor and patience is his " Bibliotheca Entomologica," a 

 list of all the publications on the entire field of entomology up to 

 1862, grouped under author's names, these latter alphabetically 

 arranged. The work is octavo size, and was published by W. 

 Engelmann, Leipsic. Vol. I, 1862, 566 pages, runs from A to 

 M; Vol. II, 1863, 512 pages, N to Z, with numerous indices and 

 a vast amount of other useful bibliographical aids to the working 

 entomologist. By the production of this work Dr. Hagen has 

 earned the thanks of all future generations of students. 



In the " Report of the Trustees of the Museum of Comparative 

 Zoology at Cambridge" for 1867, Prof. Louis Agassiz wrote: 

 " It gives me great pleasure also to state that I have been able to 

 induce Dr. Hagen, of Kcenigsberg, to come over to Cambridge 

 and assume the arrangement of the Department of Entomology. 

 The loss of Mr. Uhler, who, to my great regret, was called away 

 from us by his appointment as superintendent of the library of 

 the Peabody Institute, at Baltimore, left a great hiatus in our or- 

 ganization. This blank is now filled, and the high position which 

 Dr. Hagen holds among entomologists makes his presence among 

 us not only of immense practical service to the Museum, but an 

 honor also to the scientific character of the institution." Dr. 

 Hagen was placed in charge of the Articulates in the Museum, 

 and his first report thereon is included in the " Trustees' Report" 

 for 1868. In it he says: " I arrived in Cambridge, Oct. 12, 1867, 

 having come to this country in order to take charge of the collec- 

 tion of Articulates in the Museum of Comparative Zoology, and 

 especially to rearrange the entomological collection," and in this 

 report he presents a plan of arrangement. Some years later the 

 Crustacea and Annelids were removed from his care, so that the 

 Department of Insects was his sole charge. In the " Reports" 

 for 1875, and later, his name appears as Professor of Entomology, 

 on which subject he gave instruction to special students. 



From May to October, 1870, he revisited Europe, one fruit of 

 which was, as stated in his report for that year, that his own col- 

 lection of Neuroptera and Pseudoneuroptera had reached this 

 country, and had been deposited in the Museum. In this Cam- 

 bridge possesses one of the finest collections of these groups in 



