28 



von Osten-Sacken, for a memoir on the Diptera of Central 

 America. 



One student (Junior) has worked through the whole year on 

 a special work (synopsis of Rhopalocera) ; another (Postgradu- 

 ate) has given what time he could spare to the determination of 

 North American Noctuina and Bombyces. Another special 

 student from Canada has worked throughout the winter here. 



The correspondence was as large as usual. 



In addition to the purchases by the College, the Assistant has 

 added to the library a number of rare old works and papers, 

 by Peck, Say, and Harris. 



The Assistant has published in " Nature," two papers on C. C. 

 Sprengel, and one on Devonian Insects. In Carus Zoolog. An- 

 zeiger, " Ueber Devonische Insecten." In "Papilio," several 

 papers and lists of the types of North American Tineina in the 

 collection, with notes by Prof. H. Frey, Zurich. In " The Cana- 

 dian Entomologist," papers On Chalcographa scalaris and its En- 

 emies ; On Scolytus ruguloms and the Pear Blight ; List of the 

 Phytoptocecidia or Mite Galls in the Museum ; The Melsheimer 

 Family and the Melsheimer Collection ; A Biographical Notice 

 of the Rev. D. Ziegler ; On Xylorydetes Satyrus ; On the Hab- 

 its of Coelojoa frigida ; White Ants destroying living Trees and 

 changing the Foliage in Cambridge, Mass. ; Further Materials 

 on the Hessian Fly, — partly from the old records of the Philo- 

 sophical Society in Philadelphia, destroying the old tale of the 

 importation by Hessians ; and On the Hessian Fly in Italy. 



A Monograph of the Embidina is just going through the 

 press ; and the First Part of a Monograph of the Immature 

 Stages of the Odonata is in the hands of the printer in Phila- 

 delphia. 



