May, 1907.] .4 Collecting Trip Xorth of Sault Ste. Marie. 145 



N^ote on Aeshnas. The main purpose of this collecting trip 

 Avas to studv the Aeshnas of the region in life. I believe that in 

 the material collected by myself four species are represented. 

 This belief is based however, largely on opinions formed in the 

 field and not on study of the material after my return. This 

 studv will be made by Prof. E. M. Walker to whom I have sent 

 my entire collection. Professor Walker's study will not be 

 completed in the immediate future and for my purposes in this 

 paper I have listed the species under four letters. Representa- 

 tives of these four species, as I understand them, have been sent 

 to Dr. Calvert for examination, and his notes on male abdominal 

 appendages follow. But as I understand it, Dr. Calvert's opinions 

 on these species are tentative, and the demands on his time per- 

 mit no particular study of this matter now. So the question of 

 the status of the four forms here indicated now rests with 

 Professor Walker, to whom as stated, I have sent the entire lot. 



Dorsal thoracic stripes short and narrow ; lateral , thoracic 

 stripes divided each into two spots. Male anal triangle two- 

 celled; appendages juncea type (intermediate between clepsydra, 

 typical, and eremita — Dr. Calvert). Female appendages longer 

 than the male, narrow, apex rounded. Aeshna W. 



Dorsal thoracic stripes short and narrow ; lateral thoracic 

 stripes not divided; first lateral stripe wider below- size large. 

 Male anal triangle two-celled; appendages juncea tvpe (eremita 

 form of appendages — Dr. Calvert). Female appendages about 

 equal to male appendages, apex rounded. Aeshna X. 



Dorsal thoracic stripes wide, reaching antealar sinus where 

 they are widened ; lateral thoracic stripes not divided ; first lateral 

 stripe wider below; size smaller than Aeshna X. Male anal tri- 

 . angle two-celled; appendages juncea type (clepsydra, typical, 

 form of appendages — Dr. Calvert). Female appendages shorter, 

 apex rounded. Aeshna Y. 



Dorsal thoracic stripes wide, reaching antealar sinus where 

 they are widened; lateral thoracic stripes not divided, about 

 equal and uniform in width; abdomen with the blue spots 

 greatly reduced in size. Male anal triangle three-celled; appen- 

 dages cyanea type. Female appendages slightlv longer than the 

 male, apex rounded. This species has been widely listed as 

 constricta. Aeshna Z. 



19. Aeshna W. Heyden, July oOth and 31st, and Aug. 2, 3 

 and 4th. Searchmont, Aug. 6 and 9th. Eleven males and six 

 females. On the afternoon and about sunset of Aug. 3d there 

 were heavy showers of rain accompanied by thunder and light- 

 ning at Heyden. The yard of the shingle mill is devoid of all 

 vegetation. Many shallow pools which disappeared before the 

 next morning were formed in the yard. After sunset the rain 

 ceased and almost at once dragonflies began to appear about 



