314 ENTOMOLOGICAL NEWS. [December, 



which he presented on that occasion, three were medical and one 

 'entomological {Neuroptera et Orthoptera conjungi debent}, while 

 the Synonymia above quoted was his " Dissertatio inauguralis." 

 He afterwards studied in Berlin, Vienna and Paris, but returned 

 to his home, describing himself in his Bibliotheca as " Arzt in 

 Kcenigsberg." 



His earliest and latest entomological publications concerned 

 the Odonata, but throughout his entire life nearly every order of 

 insects received a contribution from his studies. Early in the 

 forties appeared the first of his numerous papers in the ' ' Stettiner 

 Entomologische Zeitschrift. " Some of these were his earliest 

 palaeontological essay, Die fossilen Libellen Europas 1848, a 

 review of the later literature on the Neuroptera 1848-52, Die 

 Sing -deaden Europas 1855, '56, '58. 



A kindred spirit for the study of the Odonata, Dr. Hagen 

 found in the eminent Belgian entomologist, Baron Edmond de 

 Selys-Longchamps, four years his senior, and who still attends 

 the meetings of the Belgian Entomological Society. Jointly, they 

 produced what is still the standard work on European dragonflies, 

 the " Revue des Odonates" (Brussels, 1850), " Monographic des 

 Calopterygines" (1854), " Monographic des Gomphines" (1858), 

 and if their joint names do not appear on later publications, yet 

 each received and acknowledged the constant aid of the other, 

 whether in Europe or separated by the Atlantic. 



From 1850 until his departure for the United States, Dr. 

 Hagen' s entomological activity is well shown by the following 

 list of his more important publications: " Leon Dufour ueber die 

 Larven der Libellen mit Beriicksichtigung der fruherer Arbeiten' ' 

 (1853), "Monographic der Termiten" (1855, '58, '60), "Die 

 Phryganiden Pictet's nach Typen bearbeitet" (1859-61), "Re- 

 vision critique des Phryganides decrites par M. Rambur d'apres 

 1'examen des individus types" (1860), "Ueber Phryganiden- 

 Gehause" (1864), " Phryganidarum Synopsis Synonymica" 

 (1864), "Beitrage zur Kenntniss der Phryganiden" (1865), 

 " Beitrage zur Kenntniss und Synonomie der Psociden" (1866), 

 <( Hemerobidarum Synopsis Synonymica" (1866), " Psocinorum 

 et Embidinorum Synopsis Synonymica" (1866); papers on the 

 insects, mainly Neuropterous, of various parts of Europe, Cey- 

 lon, Syria, Mozambique', Cuba, Madeira and America, of which 

 the most important is the " Synopsis of the Neuroptera of North 



