ENTOMOLOGICAL NEWS 



AND 



PROCEEDINGS OF THE ENTOMOLOGICAL SECTION, 



ACADEMY OF NATURAL SCIENCES, PHILADELPHIA. 



VOL. II. 



DECEMBER, 1891. 



No. 10. 



CONTENTS: 



Bruce Sphingidae of Colorado 190 



Banks Synonymical Notes in Spiders.. 193 



Fox Hymenopterological Notes 194 



Skinner Elementary Entomology 196 



Townsend A Tachinid Parasite of 

 Chrysophanus dione 197 



Calvert A new genus and species of 



Odonata 199 



Cresson A Conjecture 200 



Notes and News 206 



Entomological Literature 209 



Doings of Societies 212 



Our illustration represents some butterflies which were photo- 

 graphed to see if the colors could be identified by a color key. 

 The possibility of this has been investigated by Mr. J. F. Sachse, 

 editor of the " American Journal of Photography," who read a 

 paper on the subject before the Photographic Society of Phila- 

 delphia entitled. " A Suggestion for a Possible Method of Iden- 

 tifying Colors Photographed." It can readily be seen how useful 

 such a method would be in the illustration of Natural History 

 objects. 



We quote from the paper above referred to " The production 

 of orthochromatic or color-stained plates, which will yield nega- 

 tives or prints giving approximately true color values is at present 

 one of the active problems of the photographic world, attracting 

 the attention of specialists and active researchers in almost every 

 country." Ever since the orthochromatic principle was first 

 broached, the hope was fostered that by some means, in addition 

 to giving true color value, it would become possible to find a 

 method to distinguish or identify by the print the colors of the 

 original. "In connection with this subject I wish to bring to 

 your notice a suggestion for a simple method by which this much 

 desired object may be obtained, at least under certain conditions 

 in suitable subjects. The suggestion, as you will see, is simply 



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