ODONATA OF BAJA CALIFORNIA. 467 



figures of two new species, Ischnnra f erratica and 

 yEsc/ina califoniica, while special mention must be made 

 of the reported occurrence in California of CaJoftcryx 

 maailata not hitherto known west of Kansas, Euthore 

 fosciata of Venezuela and Colombia, and Efofhthahnia 

 elegans of China and Japan (see the appendix). 



3. The generic variations given are, first, variations 

 from conditions assumed by other writers to be generic; 

 second, variations from those adopted in this paper as 

 generic. They are to be found under the respective 

 species. 



A few words should be said on the specimens preserved 

 in alcohol. Dr. Eisen having written that collections 

 could be made in that way, I suggested that the insects 

 should be placed at once in strong, warm alcohol. The 

 result has been to preserve the bright and brilliant colors 

 of these dragon-flies in a most gratifying way, and it is 

 difficult to believe that after a lapse of one year any con- 

 siderable fading has taken place. Such magnificent 

 colors as those of Anax Wahinghami, ^Eschtia hiteifen- 

 nis, Libclhila saturata, etc., have thus been as available 

 for description as if from fresh individuals. It should be 

 stated that, except when under examination, the speci- 

 mens have been kept in alcohol and in the dark. 



I desire to acknowledge the valuable assistance rendered 

 me by the Baron Edmond de Selys-Longchamps, of 

 Liege, Belgium, on the difficult genus ^r^vV; as mentioned 

 in the text. Mr. Samuel Henshaw has done me the great 

 kindness of comparing specimens of Enallagma Eiseni, 

 Dythemis sterilis and T?-ithemis basifnsca with the collec- 

 tion in the Museum of Comparative Zoology at Cambridge, 

 Mass. 



