the Cup-like Coverings 0/ PsyllideSj dec. 239 



folded and laced together by white threads, has generally 

 one or two tenanted cones and a large ball of fluid lerp 

 within its abode. 



■I have recently met with another species oiPsyUa located 

 on the red-curled leaves at the extremities of fresh young 

 shoots, and protected by a different land of lerp. The 

 edges of the leaf are turned over so as nearly to meet ; and 

 within each of the two grooves thus formed is a series of 

 white opaque shells of an elongated oval shape. (Fig. 3 b.) 



They are of a waxy consistence, and tasteless. The lower 

 part is a thin film adhering to the surface of the leaf; tlie 

 upper is much thicker, and covers the insect enclosed as in 

 a bivalve shell. Overlapping each other like the scales of a 

 fish, the upper valves form two rows down the sides of the 

 leaf. The perfect insect (Fig. 3, uat. size) is about one- 

 half larger than the cone-forming Psylla, the head and pro- 

 thorax are of a bright yellow, the remaining segments of 

 the thorax are dark brown, the abdomen a yellow green, 

 and the elytra yellow, with two elongated dark brown spots 

 at each tip. 



When my attention was first directed to this subject, 

 more than four months ago, I found, besides the common 

 white lerp and its occupant, a larger and differently 

 coloured lerp, with its peculiar Psylla, surpassing in beauty 

 and structural development the species already described. 

 The eggs of this third species are of a deep black-red 

 colour, sometimes disposed in groups, sometimes isolated, 

 and occasionally on the same leaf as those of the first kind. 

 The colour of the larva is a reddish brown. The first shell- 

 like coverings are little transparent, and in many parts quite 

 opaque and dark brown. Its form is remarkably like to 

 that of one valve of a cockle-shell. (Fig. 5.) The apex 

 or hinge is always well attached to the leaf. As the insect 



