TVTM OF GNATS. 



28: 



a, a, larva of Carethra plumicornis magnified, b, the mandibles 

 and palpi, c, the respiratory tins, d, the pupa magnified, e, 

 pupa, natural size. /, larva, natural size, g, the female liy. 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. 



