j^otice. 



BY THE DIRECTOR. 



The Technical Series of the bulletins of this Station was begun as a 

 channel for the publication and pies ovation of papers, the incidental 

 product of the investigations of the Station, but which, by reason of 

 their technical character, are of interest chiefly to thoe engaged in scien- 

 tific research. 



While the papers thus far published in this series are all more or less 

 fragmentary and many relate to other lines of work, the leading object 

 in view has been the collection of material which may some day be 

 worked into a systematic biological survey of the State, this to serve as 

 the basis of a more accurate knowledge than is now possessed for the 

 prosecution of the more distinctively economic work. 



The previous issues in this series have been as follows : 



TECHNICAL SERIES, VOL. I, NO. 1, OCTOBER, 1889. 



Article I. Preparatory stages of the 20-spotted Ladybird. (Illustrated.) 



C.M. Weed. 



Article II. Studies in pond life. (Illustrated) C.M. Weed. 



Article III. A partial bibliography of insects affecting clover C. M. Weed. 



TECHNICAL SERIES, VOL. I, NO. 2, MAY, 1890. 



Article IV. Flowering plants on the grounds of the Ohio State University. 



Moses Craig. 



Article V. Fourth contribution to the life history of little known plant lice. 



C.M. Weed. 



Article.VL Descriptive catalogue of the shells of Franklin county, Ohio. (Illus- 

 trated) -BT A. Surface. 



TECHNICAL SERIES, VOL. I, NO. 3, APRIL, 1893. 



Article VII. Methods of oviposition in the Tipulidae. (Illustrated) P.M. Webs'er. 



Article^VIII. A Dipterous gall- maker and its associate?. (Illustrated).. P.M. Webster. 

 Article IX. Description of a new species of gall-making Diptera. (Illustrated.) 



John Marten 



Article X. Description of a species of Chlorops reared from galls on Mnhlenbergia 

 mexicana 8. W. WMiston. 



Article XI. Notes on some species of Ohio Hymenoptera and Diptera heretofore unde- 

 scribed. (Illustrated) P.M. Webster 



