SIXTH REPORT OF THE DIRECTOR IO/X) 53 



have been worked out. Likewise, a number of species of Cinc- 

 ticornia, a genus confined to oak, has been reared and some 

 very gratifying data obtained. These by no means exhaust 

 possibilities with this group, since material has come in so 

 rapidly in recent months that it has been practically impossible 

 to classify it adequately and at the same time collect or rear 

 additional forms. Over 50 species have been reared during the 

 year, most of them new and making a total in the collections 

 of probably over 800 species, about 350 having been reared. 

 This large number of specimens, in some instances species are 

 represented by a hundred midges, is practically classified and 

 only requires a relatively small amount of descriptive and col- 

 lative work before being made available to the public. 



Special acknowledgments in this connection are due Miss 

 Cora H. Clarke of Boston, Mass., who has collected and for- 

 warded to us large series of galls from which we were able to 

 rear a number of previously unknown species. The care of 

 this material devolved largely upon Mr D. B. Young, who has 

 met with exceptional success in rearing the flies. Miss Fanny 

 T. Hartman has assisted in caring for the biological material 

 and has made excellent microscopical mounts of many of these 

 extremely delicate midges. 



Publications. Many brief, popular accounts dealing with in- 

 jurious insects have been prepared by the Entomologist for the 

 agricultural and local press and a few notices of more than 

 general interest have been disseminated as press bulletins or 

 through the agency of the Associated Press. A comprehensive popu- 

 lar bulletin on the Control of Household Insects, made advisable 

 by the recent great advances in our knowledge of the relation of 

 insects to the dissemination of disease in particular, was issued 

 in May and is now, due to the great demand for such information, 

 practically out of print. The report for last year, owing to delays 

 incident to publication, was not issued till the last of the present 

 year. A popular account summarizing one phase of our studies of 

 gall midges and entitled : " Gall Midges of the Goldenrod," appeared 

 in the Ottazva Naturalist for February. Biological data and brief 

 descriptions of nearly 50 reared species of Cecidomyiidae were 

 published in the issue of the Journal of Economic Entomology for 

 August. 



Collections. The additions to the collections have not been 

 very extensive, since the amount of material already at hand de- 



