AESCHNA. 123 



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 JE. clepsydra, but not confluent on the last segment, with 

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

 those of M. 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, pterostigrna small, blackish-brown; membranule brownish- 

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



Length 67 millini. Alar expanse 95 millim. Pterostigma 3 

 millim. 



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



7. 2&. hudsonica ! 



Aeschna hudsonica Selys' Collection. 



Hab. Nova Scotia. 



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



8. 2B. constricta! 



Aeschna constricta Say. Journ. Acad. Pkilad. 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 tibise 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, divided, 

 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. 



