AESCHNA. 1 23 



three oblique, yellowish-green stripes; feet black, femora and tibia? 

 above, rufous ; abdomen long, slender, equal, very much narrowed 

 behind the inflated base, fuscous, spotted with blue; spots like 

 those of jiE. clepsydra, but not confluent on the last segment, with 

 a small, basal tooth upon that segment; appendages similar to 

 those of JE. clepsydra, the tip of the apex acute, hardly incurved, 

 above, before the apex, with an elevated line, no teeth; inferior 

 appendage one half shorter, elongated, triangular, acuter; wings 

 hyaline, pterostigma small, blackish-brown; membranule brownish- 

 cinereous. Male. 17 20 antecubitals; 11 12 postcubitals. 



Length 67 millim. Alar expanse 95 millim. Pterostigma 3 

 millirn. 



Hab. Washington (Osten Sacken); New York (Calverly). 



7. -S3. hudsonica! 



Aeschna hudsonica Selys' Collection. 



Hab. Nova Scotia. 



Similar to JE. juncea, but only known to me by name. 



8. 2S. constricta ! 



Aeschna constricta Say. Journ. Acad. Pliilad. VIII, 11, 3. 



Brownish-black, spotted with green and blue; labrum yellow, 

 head yellowish-green in front, a black T spot above ; thorax fus- 

 cous, dorsum each side with a stripe, which is broader at the wings, 

 the sides each with two oblique, green stripes ; feet black, femora 

 and tibia3 above, rufous ; abdomen long, equal, blackish-fuscous, 

 very much narrowed behind the inflated base; segments 3 10 

 with two, dorsal, apical, quadrangular, blue spots, 3 8 with two, 

 medial, triangular, yellow spots, each side with a basal, diyided, 

 blue spot; second segment with a basal, dorsal, line, and each side 

 with a transverse line upon the middle, yellow; the last segment 

 flat above; appendages fuscous, superior ones long, subarcuated, 

 the apex dilated, within carinated, before the apex tuberculous and 

 inwards an acute, recurved tooth, extreme apex with a longer 

 spine, which is acute and placed inferiorly; the inferior appendage 

 one-half shorter, elongately triangular, obtuse; wings hyaline, 

 pterostigma small, fuscous ; membranule fuscous, the base white. 

 Male. 17 21 antecubitals; 11 15 postcubitals. 



