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Vol. XXXIX. LONDON, MARCH, 1907. No 3. 



A NEW SOMATOCHLORA, WITH A NOTE ON THE SPECIES 



KNOWN FROM ONTARIO. 



BY E. M. WALKER, B. A., M. B., TORONTO. 



In my "First List of Ontario OJonata" (Can. Ent., XXXVIII; 1906, 

 p. 151), I recorded Somatochlora elongata (Scudd.) from Toronto, De 

 Grassi Point (Lake Simcoe) and Algonquin Park, and remarked upon the 

 fact that the superior appendages of the male were more incurved in the 

 examples from Toronto and Lake Simcoe than in those from Algonquin 

 Park. A further study of these specimens revealed other marks of distinc- 

 tion, and led me to the conclusion that the two forms were specifically 

 distinct, those from Algonquin Park belonging to true elojigata, while the 

 others represented a closely allied but apparently undescribed species. 

 Mr. E. B. Williamson, to whom I sent sketches of the abdominal 

 appendages of both forms, wrote that he had also taken them both, and 

 was likewise of the opinion that the species in question was new. Dr. 

 Calvert, to whom I sent a specimen, expressed the same opinion, and 

 added that he had a pair of the same form from Sherbrooke, Que., taken 

 by L'Abbe Begin. Since then I have examined these specimens myself. 



I also learned through Mr. Williamson that the description of the 

 nymph of i?/^«^a/rt,« as given by Prof. Needham (Aquatic Insects in the 

 Adirondacks, Bull. 47, N. Y. State Mas., 1901, 499), probably belongs to 

 the same new species. I have one of Needham's specimens from the 

 same locality before me, and it is certainly identical with my other 

 specimens. Needham's figures of the appendages are from specimens in 

 the Museum of Comparative Zoology, Cambridge, Mass., and are those 

 ot true elongata. 



Somatochlora Williamsoni, sp. nov. 

 1 90 1. Somatochlora elongata^ Needham, Aq. Ins. in the Ad., Bull. 47, N. 



Y. State Mus., 499. 

 1906. Somatochlora elongata, Walker, Can. Ent, XXXVIII, 151. 



Closely related to S. elongata (Scudd.), with which it agrees in size 

 and proportions, but differs in the form of the superior abdominal 

 appendages of the ^ and in ceptain details of colour pattern. 



