II 



FLIES WITH AQUATIC 



163 



Copepod Crustacea creep out of water by a similar 

 use of the surface-film. 1 



The attitude, the mode of breathing and the mode 

 of feeding observed in the larva of Dixa, are curiously 



fffi 



id! 



/( 



FIG. 49. Pupa of Dixa in side-view, and from ventral aspect. 



like those of a certain Gnat larva, Anopheles. So 

 close is the resemblance that an experienced entomo- 

 logist has, in a published paper, mistaken one for the 



1 Journ. Linn. Soc. Zool, Vol. XXV. p. 18 (1894). 



M 2 



