3i6 ENTOMOLOGICAL NEWS. [December^ 



the world, and which, for North American forms, is without a 

 rival. 



In 1879 he presented his entomological library of 762 volumes 

 and 3000 pamphlets to the Museum. He spent the greater part 

 of the Summer of 1882 in an economic survey along the line of 

 the Northern Pacific Railroad, but especially in Washington. 



From 1868 to 1890, Dr. Hagen's reports tell the same tale of 

 unceasing work in the arrangement of the large and constantly 

 increasing collections of insects acquired by the Museum, a very 

 large part of which, tedious as it is, was performed by his own 

 hands. Although for several years previous he had been unwell, 

 in September, 1890, his health became so poor as to force him 

 to abandon all work, and his last entomological paper, ' ' Notes 

 and Descriptions of some North American Libellulina" appeared 

 in October of that year. Since then he steadily grew more feeble. 



Dr. Hagen's most important publications during his residence 

 in America were: ' ' Monograph of the North American Astacidae" 

 [Crayfishes] (1871), "Synopsis Pseudoscorpionidum Syno- 

 nymica" (1871), " Mimicry in Colors of Insects" (1872), " Bei- 

 trage zur Kenntniss der Phryganiden" (1873), "Synopsis of the 

 Odonata of America" (1875), " Beitrage zur Monographic der 

 Psociden" (1882-83), " On the Genus Colias" (1882), "Mono- 

 graph of the Hemerobidae" (1884-88), " Monograph of the Em- 

 bidina" (1885), " Monograph of the earlier stages of the Odonata, 

 subfamilies Gomphina and Cordulegastrina" (1885), "Stray 

 notes on Myrmeleonidae" (1887-88), and portions of Mr. L. 

 Cabot's monograph "On the Immature state of the Odonata"^ 

 (1872, 1881. 1890). 



Dr. Hagen was an excellent artist, and illustrated many of his 

 own papers. Most of the plates in the monographs of the 

 Odonata, written in conjunction with Baron de Selys, are his 

 work, and many unpublished drawings exist among his papers 

 at Cambridge. 



Of Dr. Hagen, personally, the writer can say little, but that 

 is very pleasant. I met him but once, for parts of three days in 

 July, 1890, at the Museum in Cambridge. Although unwell and 

 obliged to rest frequently, he showed me his collection of Odonata, 

 giving me types and other specimens. He was very hopeful of 

 recovery, and talked of the work he would like to do next year. 

 Referring to Westwood, Burmeister, Poey, Gundlach and de 



