3656 



The Zoologist — August, 1873. 



a matter of no little consolation to me to be enabled, tlirougb the courtesy 

 of my valued friend Dr. Emile Joly, to announce, on his behalf, to the 

 Society, his important discovery of the first uym^jh known in the genus 

 Oligoneuria, and belonging to the species named by him ' Garumnica." For 

 this purpose I translate here Dr. Joly's communication from the French 

 MSS., agreeably to his desire. My friend writes, 'I have the honour of 

 addressing to the Entomological Society of London two drawings, to my 

 knowledge entirely unpublished, and representing (fig. a), the upper side,* 



Fifr. B. 



Fig. A. 



(The above are three times the natural length.) 



and (fig. b) the under side of the nymph of a new species of Oligoneuria, 



for which I have already proposed the specific name " Garumnica. "t In 



1869, on the very last excursion which I had the opportunity of making in 



* This nymph, like the one of Palingenia Eoeselii {vide Mem. de la See. des 

 Sci. Xat. de Cherbourg, t. xvi.), with long cilice only on the internal border of the 

 anterior legs, presents, like tjie last, above the thorax and in pairs overlying each 

 other, /our corneous sheaths intended to lodge the folded-back (repliees) wings of the 

 insect up to the moment of its passing to the subimago state. It is therefore not, 

 as Imhoflf supposed, by a kind of division, by a spontaneous Assuring, that the four 

 wings are formed, which are so easily recognised in the imago state of the insect, 

 but rather that if sometimes there seem to exist only two wings, it is, as Hagen had 

 at first deduced theoretically, because there exists a perfect attachment by simple 

 agglutination of the posterior border of the fore wing to the anterior border of the 

 hind wing. 



+ Emile Joly, 1870, " Contributions pour servir a I'Histoire Naturelle des 

 Ephemerines," Xo. 1, in t. iv. du Bull, de la Soc. d'Hist. Nat. de Toulouse, avec 

 Planche. 



