PUP.E OF GNATS. 



287 



#, a larva of Ccrcihra plumicornis magnified. 6, the man- 

 dibles and palpi, c, the respiratory fins. , the pupa magnified, 

 e, pupa, natural size. /, larva, natural size, t, the female fly. 

 h, the male fly . 



We possess a small aquatic pupa which is furnished 

 at the tail with four horny hooks resembling the 

 prickles on the stem of a rose-tree, and evidently 

 intended as suspensory appendages. It was found 

 hanging to a deal board, which had been immersed 

 in running water, and seems from its form to be the 

 pupa of a moth (Hydrocampa?)* 



* J. R. 



