1894.2 . 19 



Gromphines " (1857), and in the various synopses of Odonate Families and their 

 additions that are so well known to all Neuropterists. From 1855 to 1858 he was 

 engaged on a Synopsis of the European Cicada, and from 1855 to 1860 on his 

 " Monographie der Termiten," which in many respects is perhaps his masterpiece, 

 dealing as it does, in a wonderfully detailed manner, witli what is probably the most 

 difficult of all Families of Insects. In 1861 appeared his " Synopsis of the Neuroptera 

 of North America " (Smithsonian Institution), which was intended to be followed 

 later by a Monograph on the same subject, but this latter, unfortunately, never ap- 

 peared in a collective form. I say " unfortunately," bepause several important groups, 

 such as the Planipennia and Trichoptera, were not worked out in the Synopsis with 

 his usual detail. For several years prior to this Hagen had been engaged in com- 

 piling the " Bibliotheca Entomologica," which appeared in two vols, in 1862 and 

 1863, giving a List of all works and papers on Kntomology that had appeared from 

 the earliest times. That work, as affording a means of ready reference (rendered 

 still more useful by the analytical register at the end of the second vol.), almost 

 revolutionized the science, and it was truly said that having got it, the wonder was 

 how we existed so long without it. Omissions and errors have naturally been de- 

 tected since — that these are so few is a marvel. 



All this time Hagen had been labouring at his profession as a medical man in 

 his native town, and adding to his small income by occasional literary work ; but 

 his letters to me at one time were despondent as to his futui'e. However, in 1867, 

 he was asked by Louis Agassiz, the Director of the Zoological Museum of Harvard 

 University, Cambridge, Mass., to take charge of tlie Entomological Section. Be 

 accepted the position, and finally left Europe in the autumn of 1867 to undertake 

 his new duties (a portion of his collections being destroyed en route, to his great 

 grief). Once installed there, he set to work with a will, and put in order that which 

 had been comparative chaos, turning his attention especially to illustrating the life- 

 histories of insects, a feature for which the Museum has become renowned. He 

 became Professor of Entomology at the University. In America it was almost ne- 

 cessary he should devote much attention to economic entomology, and he suggested 

 a means of destroying noxious insects by means of inoculation with the yeast 

 fungus. In 1882 (then at the age of 65) he joined a long and arduous exploring 

 expedition, and accumulated much materials, one outcome of which was a paper on 

 the genus Colias, which attracted much attention and occasioned much controversy. 

 These duties, necessities of his office, left him little time for his Neuropterous 

 studies, but he continued to publish on the Order. He revisited Europe for a brief 

 period on two occasions, and on the second of these I met him at Southampton when 

 on his return — the last time I saw him. In September, 1890, he was stricken with 

 paralysis, and an attack of influenza in the following January rendered his recovery 

 hopeless. He lingered on for nearly three years in a deplorable state, helijless as an 

 infant, conscious of his condition, with his bodily functions unimpaired, yet reduced 

 to a skeleton (he was formerly a very heavy man), kept alive by the devoted care of 

 his wife (whom he married when quite young, but had no family). I cannot but 

 echo the expression of one of his oldest friends in America — a happy release for 

 both of them ! 



In conclusion it becomes necessary to say a few words as to my personal con- 

 nection with Hagen. I was most emphatically his pupil. When he was in London 



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