THE ENTOMOLOGIST. 299 



imago has, as yet, baffled all my attempts to rear. The adult 

 larva of Fenusa Ulmi never pupises inside the mined leaf, 

 but buries itself in the ground, the imago appearing about 

 the middle of May. The parasite of F. Ulnii spins up inside 

 the mined leaf. For the last seven or eight years I have 

 noticed the larva of this Tenthredo very abundant in the 

 leaves of Ulmus eampestris growing at Stratford, Essex ; it 

 is also common in the leaves of the same tree in the Adding- 

 ton Road, Croydon, and it is a constant yearly visitor to 

 Ulmus raontana growing at Shirley, in Surrey. I have also 

 met with it in the leaves of Ulmus eampestris in the lane 

 loading to Dartford Heath, and it appears to be generally 

 distributed. — Charles Henly. 



Life-Jiistory of Fenusa 'pygmxea, Hartig. — All through the 

 summer and autumn months any one examining the leaves of 

 the connnon agrimony (Agrimonia Eupatoria), particularly 

 those growing nearest to the ground, will in all probability 

 perceive that some of them contain a brown blotch. This 

 discoloration of the leaf is caused by the larva of Fenusa 

 pygmaea having devoured all the parenchyma which vs^as 

 formerly situated within the radius of the blotched area : the 

 mine has a dull dotted look, especially so the smaller mined 

 leaves, caused by the circumstance of the creature's leaving 

 its frass and cast-off skins within the mine. On examining 

 the leaves of this plant about the middle of the month of 

 May, some of them attract our attention from the simple fact 

 of their containing one, two, or even three little galleries in 

 them ; and at the broadest end of each of the little galleries 

 a minute caterpillar is perceived lying on its back. At that 

 time of the year we shall probably notice that the contained 

 larva is lying perfectly still, prejjaratory to undergoing ils 

 first moult; its three anterior segments are seen to be glossy 

 white, and its green-coloured dorsal vessel shows through the 

 white body. This litlle Tenthredo larva has three pairs of 

 thoracic, seven pairs of abdominal, and two anal legs ; ttiere 

 is an entire absence of legs on both the 5th and 13th seg- 

 ments. Shortly after its ecdysis is comideted the little 

 creature recommences feeding, and we then observe that it 

 departs from ils previous mode of feeding in a narrow mine, 

 and commences blotching the leaf. Its head is pale brown, 

 darker at the sides; its body white; tlie dorsal vessel green : 



