.V.l Y-FLIES. 



71 



Family Libellulid t Burm., A 



I .In-., /.//'< ('/'//•/ ti 



Obdi a V I. Plectoptera [M 



Like the dragon-flies, the Ephemerae or May-flies are in 

 their own \\a\ very peculiar insects, and cannot 1"- pla 

 in any of the older established orders. We have therefore 

 proposed the name Plectoptera for the group, 

 in allusion t<> the fine, gauzy network of 

 their wings. 



The adult May-flies are characterized by 

 the yerj rudimentary condition of the 

 mouth-parts. In examining the under side 

 of the head there is a hollow, with only 

 Blight rudiments of the mandibles, maxi 

 and labium. As th< but a 



hours, only long enough to provide for the 

 continuance of the sp I hey ne< d 



take no fund, he mouth-parts are 



Pig :■; M...> .... . oai 

 marly aborted, and the antenna' are small ami 



* Sill i l li> \\ ORR8. 



Eaton, A. E. A revisional monograph of recent Ephemerids or May- 

 flies. Pails 1 IV. (Trans. Linn. S. . . I 



Hagen, H. A. Synopsis of the Neuroptera <<t' N 



Lubbock, J. Developmenl of Chi I. inn. 



S ■>-.. London, xxiv.-v., L865 ■ 



Packard. A. S. (External anatomy, in third i 

 Commission, L888, pp. 383 335, Pis. XI. \ \:.V1 



Swammerdam, J. Ephemerae Vita (Amsterdam 



Vayssiere. A Recherches snr ['organization d des Ephe- 



merines (Ann. Sc. Nat., xiii., 1882). 



