REPORT OF THE DIRECTOR I9IO 39 



edition of Museum Bulletin 129 on the Control of Household Insects 

 and necessitated its republieation in an extended and revised form 

 as Museum Bulletin 136 entitled The Control of Flies and Other 

 Household Insects. The Entomologist has been called upon to give 

 a number of popular lectures upon this insect and has made per- 

 sonal examinations of conditions in several localities, giving special 

 attention to situations favorable for the production of flies in cities 

 and villages. 



Gall midges. Studies of this extensive and interesting group 

 have been continued and the results are now in manuscript. This 

 publication will describe fully some 800 species, 441 having been 

 reared. The tabulation of plant galls, made with the assistance of 

 Miss Hartman, shows that we know some 538 species representing 

 44 genera and living at the expense of some 177 plant genera 

 referable to 66 plant families. In addition to the above, there 

 are some 5 species reared from unknown plants and 11 species 

 belonging to 3 genera known to be zoophagous. 



A number of new species have been reared during the year. Miss 

 Cora H. Clarke of Boston, Mass., has continued to collect and 

 forward to us excellent series of galls from which we have been 

 able to rear several previously unknown species. The care of this 

 material has devolved largely upon D. B. Young and Miss Hartman. 

 The latter has also made a. large number of microscopic mounts of 

 these fragile forms. 



Miscellaneous. The Entomologist spent nearly six weeks in 

 Europe, giving special attention to museum methods, shade and 

 forest tree insects and the gall midges. Collections were studied 

 in the following institutions: British Museum of Natural History, 

 London ; the Universities of Oxford and Cambridge ; the Tropical 

 School of Medicine, Liverpool; the zoological gardens at Antwerp; 

 the Royal Museum of Natural History at Brussels ; the botanical 

 gardens of Ghent; Museum of Natural History and the entomologi- 

 cal station at Paris ; the University at Zurich ; the exceptionally 

 valuable collection of forest insects in the Forestry School at 

 Munich ; the natural history collections in the Senckenberg Museum 

 at Frankfurt; the Winnertz collections in the University of Bonn; 

 the Museum of Natural History, Berlin, and the Museum of 

 Natural History at Hamburg. In addition, the Entomologist spent 

 several days with Prof. J. J. Kieffer of Bitsch, Germany, studying 



