May, 1907.] .4 Collecting Trip Xorth of Sault Ste. Marie. 
*45 
Note on Aeshnas. The main purpose of this collecting trip 
was to study 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 
mv 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 type (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 cvanea type. Female appendages slightly longer than the 
male, apex rounded. This species has been widely listed as 
constricta. Aeshna Z. 
19. Aeshna W. Heyden, July 30th and 31st, and Aug. 2, 3 
and 4th. Searchmont, Aug. (5 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 
