450 THE CANADIAN ENTOMOLOGIST. 



A KEY TO THE NORTH AMERICAN SPECIES OF AESHNA 



FOUND NORTH OF MEXICO. 



BY E. M. WALKER, TORONTO. 



(Continued from page 391.) 



The following notes are intended merely to give a general idea of the 

 distribution, as far as known, of the species of Aeshna treated in the key. 

 Detailed lists of localities, references, etc., will appear in the revision : 



1. Aeshna Califorjiica. — A Pacific Coast species, ranging from Lower 

 California northward into southern British Columbia. 



2. Ae. multicolor. — This species ranges from Panama through 

 Mexico, and the United States west of Texas and Colorado to southern 

 British Columbia. 



3. Ae. niutata. — Thus far known only from Indiana and Massa- 

 chusetts. I have also seen a female from Stewart's Lake, Kent, Ohio. 



4. Ae. palmata. — This species ranges from Kamtchatka through 

 Alaska and British Columbia to Colorado, Utah and Lower California. 



The Lower Californian specimens differ in some degree from the 

 others seen, but are probably not ever, racially distinct. This species and 

 the following have been generally recorded as A. cotistricta. 



5. Ae. ujnbrosa ("-Ae. Z.T Williamson). — One of the most abundant 

 and widely-distributed species, occurring in a broad belt from the Atlantic 

 to the Pacific in the Upper Austral, Transition and Canadian Zones. 



Western specimens approach Ae. palmata in the more robust abdo- 

 men, larger size of PD and a few other details of coloration, but are other- 

 wise typical. 



6. Ae. constricta. — Transition and Upper Austral Zones from the 

 Atlantic Coast to the Dakotas and southern Manitoba. 



7. Ae. iiiicrrupta {^'Ae. IV.,'^ Williamson). — Boreal Zone, occasionally 

 appearing in the Transition Zone, froni Newfoundland, through Quebec, 

 Northern New England and New York to North-western Ontario and 

 Northern Michigan. 



It is very closely allied to the next three forms. 



8. Ae. interna — A mountain species, ranging from southern British 

 Columbia to California and New Mexico. 



9. Ae. lineata. — A species characteristic of the Canadian prairies. 

 It ranges from. Manitoba and North Dakota to the Rocky Mountains, and 

 thence northward to Great Slave Lake. It is the common species in 

 Manitoba and Saskatchewan. 



December, 1908 



