54 " PLATE XXIV. 



forth ; It hath a long body like the Fly, fix Legs, and a forked Head, a 

 fliarp {pine at the extremity of the abdomen, and a row of fpines on 

 each fide, one at every joint; it plunges into the water, and imme* 

 diately devours fuch of the inhabitants, or their eggs, as comes within 

 its reach, and it continues this life of depredation until its next 

 change. They are to be taken with a fmall hand-net. 



All tranfparent objects, in a certain diredion before a microfcope, 

 refle^ the colours of the prifm. The Tipula Plumofa exhibits, in 

 this fituation, an effulgence of colouring, which its natural fize con- 

 veys but fmall veftiges of; and the colours on the wing of this Libellula 

 appears far more vivid when magnified. 



The body of the male is bluifli grey j the prefent fpeclmen is the 

 female. 



PLATE 



