﻿Not having living specimens, I was unable to discover the 



mandibles and maxiilte, but Latreille says they {les soies) ap- 

 peared to him very long ; neither could I ascertain whether 

 the curious spine shown at fig. 6f. was attached to the post- 

 pectus or the coxaj ; but I am inclined to think to tlie latter. 

 I discovered, however, that the tarsi consisted of 3 joints, and 

 not of 2, as hitherto stated. 



In our excursion last July to Bottisham Fen, Prof. Henslow 

 pointed out to me the singular appearance of the Juncus, as 

 represented in our plate, and informed me that it was occa- 

 sioned by the Livia Junconun ; and on opening the tuft we 

 fountl the larva? and pupa? in some abundance. As Latreille 

 was the first historian of our insect, and gave a very excellent 

 memoir upon it, I shall give some of his remarks upon its 

 occonomy. lie ini'orms us, that "the i'emales deposit their 

 eggs in the flowers of the ,7////c/« ar/iculatus (pi. 2.), or at least 

 in their shoots. The sap of the plant repairing to these parts 

 in greater abundance, it forms there a monstrosity, which has 

 the apjiearance of a bundle of grass. The divisions of the 

 calyx are elongated into a sort of barb or awn. The eggs are 

 few in number, tolerably large, oval, yellowish, shining, marked 

 with a red dot at one end, and attached to the leaves by a pe- 

 dicel. The Larvae, as well as the Pupa?, move slowly. They 

 live constantly inclosed in the interior of these false galls, sup- 

 porting themselves on the juice of the plant, and voiding a fa- 

 rinaceous matter very white, in the midst of which they seem 

 to delight in living. The jierfect insect also remains there 

 very {|uietly, and, like the other Psyllidae, it jumps more than 

 it walks." 



The coloured Plant is Lathynis i)alustris (Marsh Vetch- 

 ling). 



