MAY. 155 



vey of this little creature would deem it capable of 

 such extensive devastation : its ravages are con- 

 fined to the elm (Ulmus campestris), the mid-bark 

 of which it perforates in a circular direction, in 

 some instances completing the circumference of the 

 tree and depositing eggs during its progress. The 

 larvae which are produced from these eggs perfo- 

 rate the bark at right angles with the perforation of 

 the mother insect, both upwards and downwards. 

 The female is generally found dead at the end of 

 the circular labyrinth : a tree, when once infected, 

 never fails to fall a victim in the course of a few 

 years to this little destroyer, however large and 

 flourishing. 



Notoxus Monoceros is a local British insect, and 

 appears to haunt the sea coast, and the banks of the 

 larger rivers in dry sandy situations ; with us on 

 the banks of the Trent, in one spot, it is found in 

 great abundance, at the roots of the tansy (Tanace- 

 tum vulgare), and the silver-weed (Potentilla anse- 

 rina). It is also very fond of dead muscles that are 

 half-dried by the sun. Mr. Marsham has given its 

 habitat on syngenesious flowers, but I have never 

 observed it to take wing. 



Of the twenty-five species of Papiliones enume- 

 rated in the list of this month, eight only are known 

 to inhabit this county ; of which the Polyommatus 

 Alexis, and the Pontia Brassicag, Napi, and Carda- 

 mines, are common, and the Melitsea Euphrosyne, 

 the Polyommatus Alsus, and the Pamphila Sylvanus 



