130 MAY. 



cumference of the tree and depositing eggs 

 during its progress. The larvae which are pro- 

 duced from these eggs perforate the bark at 

 right angles with the perforation of the mother 

 insect, both upwards and downwards. The fe- 

 male 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 situa- 

 tions; with us on the banks of the Trent, in 

 one spot, it is found in great abundance, at the 

 roots of the Tansy (Tanacetum vulgare), and 

 the silver-weed (Potentilla anserina.) 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 ob- 

 served it to take wing. 



Of the twenty-five species of Papiliones enu- 

 merated in the list of this month, eight only are 

 known to inhabit this county ; of which the Po- 

 lyommatus Alexis and the Pontia Brassicac, Napi 

 and Cardamines are common, and the Meletaea 

 Euphrosyne, the Polyommatus Alsus, and the 

 Pamphila Sylvanus are less frequent : the Pa- 



