REPORT OF THE DIRECTOR I919 25 



rather than with the minute and highly complex gall makers them- 

 selves, it will greatly facilitate the study of the interrelations be- 

 tween plants and insects. Owing to the great demand for this 

 bulletin, the edition was rapidly exhausted. 



Publications. A number of brief popular accounts relating to the 

 more important insect pests have been prepared as heretofore and 

 widely circulated through the county farm bureaus, local papers and 

 the schools. 



The Report for 191 7 did not appear until the current year and it 

 and the Key to American Insect Galls, mentioned above, are the 

 two Museum bulletins on entomology which were issued during the 

 year. The publications relating to the European corn borer and to 

 gall midges have been mentioned above. 



Collections. Very desirable additions to the state entomological 

 collections have been made during the year, some of the best material 

 being reared in connection with studies of insect outbreaks or as a 

 result of requests for information concerning previously unknown 

 forms. Special attention has been paid to the acquisition and preser- 

 vation of immature stages, since these are very dififiicult to secure. 

 This is particularly true of a number of borers similar to the 

 European corn borer found in the stems of various plants. The 

 special work upon the European corn borer is resulting in numerous 

 additions to the state collections. 



Henry Dietrich, now of Berkeley, Cal., most generously donated 

 to the Museum 551 specimens of Coleoptera, representing 160 

 species, 55 of these being new to the state collections. 



D. B. Young, assistant entomologist, donated from his personal 

 collections of earlier years, a large series of Coleoptera, consisting of 

 648 specimens belonging to 369 species previously unrepresented in 

 the state collections. This large addition to the collections has 

 necessitated the rearranging of most of the Coleoptera and in addi- 

 tion it involved the study and identification of numerous obscure 

 species. This work has been prosecuted in addition to numerous 

 identifications for correspondents and other routine duties. 



Miss Hartman's time has been very fully occupied in addition to 

 the usual duties of the assistant, by the many translations of techni- 

 cal literature needed in systematic work, the making of numerous 

 excellent microscopic preparations of small insects and the arrange- 

 ment and care of the pressed specimens of insect work and the exten- 

 sive accumulations of alcoholic material. 



The many additional calls upon the staff incident to the work upon 

 the European corn borer has greatly restricted the amot-mt of time 



