XYLINA RHIZOLITHA. 61 



drical in figure, the head full and rounded, the hinder 

 extremity also rounded, and but little tapered ; all the 

 legs are moderately well developed, and terminated by 

 sharp hooks. The ground-colour is a rather trans- 

 parent pale bluish-green, appearing colder on the back 

 and sides than it really is, from being thickly sprinkled 

 over with minute opaque whitish freckles ; these, 

 however, are but sparingly seen on the belly, which is 

 of a rather yellower green ; the head is of a more tender 

 green, with a patch of paler freckles on the side of 

 each lobe ; on the back of the second segment are four 

 whitish dots ; on the rest of the body the opaque 

 whitish dorsal line is finely edged with darker green 

 than the ground, but is so much interrupted as only to 

 appear just at either end of each segment ; the sub- 

 dorsal shows similarly as a broken whitish line, and 

 less conspicuous, while the spiracular line is indicated 

 still more faintly, existing as an interrupted series of 

 larger whitish freckles than those which besprinkle 

 the skin ; the wart-like tubercular dots are opaque 

 whitish, each having round the base a narrow un- 

 freckled ring of the semi-transparent green ground- 

 colour, and each bearing a fine whitish hair ; the spi- 

 racles white, delicately outlined with black ; the ter- 

 minal hooks of the legs whity-brown. 



By June 3rd they had attained their greatest 

 dimensions, and by the 7th had ceased to feed, and 

 were become irritable, some having lost all their white 

 markings and turned wholly green like the colour of the 

 oak leaves, and by the evening they had retired into 

 some light soil supplied to them, where they spun up 

 in cocoons, and the moths appeared, from September 

 28th to October 7th. 



I found the cocoons were about three inches below 

 the surface of the soil, and they were composed chiefly 

 of fibrous particles spun together, and smoothly lined 

 with pale grey silk. The pupa itself is nearly five- 

 eighths of an inch long, and stout in proportion, 

 being a quarter of an inch in diameter ; the head and 



