22 



REPORT ON INSECTS. 



By Dr. H. A, Hagen. 



There have been presented to the Museum a large number 

 (42) of additions, among them many biological specimens. The 

 most important are from Dr. Fritz Mueller of Brazil ; from Dr. 

 G. J. Engeleman, St. Louis, Mo. ; from Dr. C. A. Dohrn, Stettin, 

 a type of the parasite of the beaver (Platypsylla) ; from J. H. 

 Hubbard, Detroit, Mich., Cave articulata ; from Dr. Ch. Y. 

 Riley, a pair of Hornia ; from Dr. Rougemont, Neufchatel, Swit- 

 zerland, Helicopsyche from Naples ; from the Museum, in Tokio, 

 Japan, a large lot in exchange. 



Scientific publications, based in part or entirely on the collec- 

 tion of the Museum, consist of the European Trichoptera, by 

 Mr. R. M'Lachlan, London ; the American Staphylinidae, by Mr. 

 Fauvel, Lille, France ; the Brenthidae, by Mr. G. Power, Rouen, 

 France ; and several papers by Dr. H. A. Hagen. 



The condition of the collection is very satisfactory. Miss M. 

 Clark has spread and set a very large number of specimens. The 

 two hundred new boxes ordered for the department allowed a 

 considerable extension of the arrangement of the insects. All the 

 Hymenoptera are arranged, filling nearly five cabinets ; of the 

 Hemiptera a part is arranged ; the Odonata are rearranged, and 

 fill nine cabinets. The Biological collection is finished for the 

 Hemiptera as far as the Cicadae. 



A large number of microscopical slides have been added to the 

 collection. 



A very remarkable lot of deformities of Coleoptera, published 

 types, was presented by Dr. J. L. Le Conte and Dr. Horn, of 

 Philadelphia, and by Mr. C. L. Harrison, New Haven, Conn. 



The answering of scientific or biological questions on obnoxious 

 insects has become an important work for the department. For- 



