VOL. LXXXI.] PHILOSOPHICAL TRANSACTIONS. 65 



Trunk, oval, brown. Trunk and Abdomen, obleng, compressed, ta- 



Abdomen, oblong, length of the trunk and penng equally towards each end, crossed with 12 



head. annular segments, margins very flat, and seem 



Legs, 6 ; with them it runs briskly, and jumps to be marked witli a double line, 



actively. Extremities. 



Wings, 4, membranaceous, longer tlian the Legs, 6, running, does not jump, 



abdomen, incumbent ; the anterior pair twice Wings, none, 



the size of the posterior. Tail, 2 slender white hairs, as long as the an- 



Tail none. tennae, with a white point, which may be called 



the rump, between them. 



Pupa : the duration and peregrinations of the larvae seem very short and con- 

 fined ; for, in a few days after issuing from their cells they fix themselves on 

 the small, but hard woody branches of the tree they were produced on ; it seem- 

 ing impossible that they can in this state transport themselves to any other. 

 About the end of Dec. or beginning of Jan. they have done issuing from their 

 cells, and are sticking fast to the branches, regularly with their heads towards 

 the extremity of the branch. The legs, antennae, and tail, are now entirely 

 gone. Their progress through this state is slow, requiring about 3 months. 

 Soon after they have settled themselves, they become covered with a hard, 

 brittle, garnet-coloured crust, similar to the lac of which the cells are made, but 

 of a brighter colour. They retain only a rude resemblance of their former 

 shape. About the end of March they have acquired 3 or 4 times their original 

 size ; a small, round lid or cover is now observed at the lower part, which opens, 

 but does not always fall off, and gives a retrograde passage for the fly, now in its 

 perfect state. 



The female insect in its pupa state is rather smaller than the male, of a brighter 

 red colour, and less active. 



Head, small in proportion to the body, pointed. 



Eyes, very minute. 



Antennce, filiform, not articulated as in the male, spreading, somewhat 

 shorter than the insect. 



Mouth : I could not discover it distinctly. 



Trunk, red, almost orbicular. 



jibdomen, red, oblong, composed of 12 annular segments. 



Extremities. 



Legs, 6, for running or jumping. 



JVings, 1, incumbent, longer than the abdomen, transparent. 



Tail, 1 white hairs as long as the insect. 



With regard to the economy of these little animals, I must, for the present, 

 be silent ; having little more than conjecture to offer on that head. The eggs, 

 and dark-coloured glutinous liquor they are found in, communicate to water a 

 most beautiful red colour, while fresh. After they have been dried, the colour 

 they give to water is less bright ; it would therefore be well worth while for those, 



VOL. XVII. K 



