XXX INTRODUCTION TO THE ODONATA. 
Zuni, New Mexico; Erpetogomphus sipedon, type 2? , Guadalajara, found by Schumann ; 
Micrathyria didyma hypodidyma, type 3, Coroico; Dythemis maya, type ¢, San 
Gerénimo; Brechmorhoga vivax, type 36, Zapote; Tauriphila azteca, type ¢, 
Guadalajara. 
The fact of having served as the original of a given figure has been indicated by a 
label attached to the specimen in question. The types belonging to Dr. Godman are 
to be deposited in the British Museum of Natural History; the first set of duplicates 
from his collection, falling to the writer, will be placed in the Academy of Natural 
Sciences of Philadelphia. The material quoted on pages 218 et seg. as of the Kahl 
Collection has been acquired by the Carnegie Museum of Pittsburgh, Pennsylvania. 
Various exchanges of duplicate specimens between the public and private collections 
concerned have been authorized. 
In conclusion, I wish to express my thanks for the aid afforded by the Curators and 
Directors of various Museums, and the owners of certain private collections, whose 
names are mentioned on page 17 and elsewhere in the text, but especially to Dr. F. D. 
Godman, Editor of the ‘ Biolegia,’ for the very liberal manner in which he has permitted 
the extension of this account of the Odonata far beyond the limits which we had 
expected would be necessary; to Mr. G. C. Champion, Dr. Henry Skinner, and my 
wife, for all the manifold assistance which they have so kindly rendered. 
A discussion on the relations of the Odonata of Mexico and Central America to 
those of other areas, to temperature, rainfall, and other environmental factors, originally 
prepared for this work, has been withdrawn for publication elsewhere. 
Philadelphia, November 1908. 
