32 PROCEEDINGS MANCHESTER INSTITUTE 



anal triangle of two cells, and the three basal, dorsal teeth on the 

 tenth abdominal segment. One male in the collection. Length, 

 67 ; alar expanse, 90. 



7. Aesclina clepsydra Say. 



Calvert, p. 248; Hagen, Syn. Neur. N. A. p. 122. 



Of special interest by reason of the denticles on the superior 

 carina of the male abdominal appendages. One male in collec- 

 tion. Length, 66 ; alar expanse, 90. 



8. Aeschna constrictor Say. 



Calvert, p. 249 ; Hagen, Syn. Neur. N. A. p. 123 ; Scudder, Proc. 

 Bost. Soc. N. H. p. 212, 1886. 



Male with anal triangle of three cells ; no dorsal teeth on ten. 

 Common about Manchester. Male and female in the collection. 

 Length, 70 ; alar expanse, 94. 



5. Aiiax Leach. 

 Calvert, p. 222; Hagen, Syn. Neur. N. A. p. 117. 



9. Aiiax Junius Drury. 



Calvert, p. 249; Hagen, Syn. Neur. N. A. p. 118. 



The prince of Dragon-flies. A strong, audacious flyer, putting 

 the skill and patience of the collector to the extreme test. Espec- 

 ially distinguished by the round black spot on the frons, surround- 

 ed by yellow, and this again by a dark blue ring. One male in 

 collection. Length, 70 ; alar expanse, 100. 



III. Sub-Family Cordulinae. 



6. Macromia Rambur. 



Calvert, p. 223. 



10. Macromia illinoensis Walsh. 

 Calvert, p. 251. 



