THE ODONATA OF BAJA CALIFORNIA, MEXICO. 



BY PHILIP P. CALVERT, 



University of Pennsylvania, Philadelphia. 



(With Plates xv, xvi, xvii.) 



In January, 1893, I was offered for examination a small 

 collection of dragon-flies from Baja California belonging 

 to the California Academy of Sciences and was asked to 

 prepare a memoir upon the subject. Upon my acceptance 

 of this proposal, dry specimens collected by Mr. Charles 

 D. Haines in various localities, and others in alcohol, 

 mainly from San Jose del Cabo, were sent to me. The 

 examination of this lot was well nigh completed when, in 

 December, 1893, a much larger collectionin alcohol, made, 

 as the labels showed, mainly by Dr. Gustav Eisen, in the 

 Cape Region, in September and October, 1893, was re- 

 ceived by me. No further collections being then contem- 

 plated by the Academy, this paper was completed, but in 

 January, 1895, I received additional collections from the 

 Cape Region made by Dr. Eisen and Mr. Frank H. Vaslit 

 in September, 1894. The total number of specimens 

 which I have thus been able to examine has been over 

 2600, representing forty species. 



The objects of this paper are : 



1. To give a complete list, with localities, of the Odo- 

 nata of Baja California. If we except two or three brief 

 notices of a line each, nothing has hitherto been published 

 on the dragon-flies of this region. 



2. To describe and figure such of the species as had 

 hitherto not been sufficiently illustrated. 



3. To determine the amount of variation in structural 

 details, especially in the venation of the wings, assumed 

 to be of generic character. For lack of time, I have not 

 included the collections made in September, 1894, in es- 



•>D Ser., Vol. IV. ( 31 ) February 19, 1895. 



