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 Zodlog. 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, Ziirich. In ‘ The Cana- 
dian Entomologist,” papers On Chalcographa scalaris and its En- 
emies; On Scolytus rugulosus and the Pear Blight; List of the 
Phytoptocecidia or Mite Gallsin 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 Coelopa 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. 
