50 JSNNlfCHlA ANGtJINALIS. 



which is translucent, glossy and greenish, finely 

 freckled with black, the head similar but with browner 

 freckles on the face ; the spots on the body are very 

 distinct, large, black, and glistening, while the pur- 

 plish-brown skin is dull and opaque ; ten days later, 

 when seen in repose it seems short and almost black, 

 though when disturbed and eager to escape it stretches 

 itself out to 8^ mm., and is then seen to be much more 

 slender, and tapered at either end ; the colouring of 

 the head and second segment is as before, a rather 

 olive-green, but the skin on other parts appears to be 

 a very dark smoky-green, and slightly glistening at 

 the segmental divisions. 



In about ten or eleven days after the third moult 

 its full growth is attained, and the length is 18 mm., 

 its stoutness in proportion, tapering from the third 

 segment to the head, also at the two hinder segments ; 

 beyond the thoracic each segment is subdivided by a 

 deep wrinkle across the middle of the back, and again 

 by one nearer the front, and another nearer the end ; 

 the two central portions, bearing the trapezoidal large 

 roundish spots, are very plump ; a similar spot is on 

 the side, another beneath the spiracle, and another is 

 lower and farther behind, near the belly ; the colour 

 of the head and second segment is bright olive-green 

 and very shining ; the lobes of the head are marked on 

 the crown with black, and with fine black freckles on 

 the face ; the plate is also finely freckled with black ; all 

 the rest of the body has a very dull purple skin, re- 

 lieved by large black and minutely wrinkled spots, 

 especially while the larva lies at rest, but when roused 

 up into activity the purple hue still becomes a little 

 neutralised by the green interior ; this change of colour 

 seems to be caused by extreme tenuity of the skin at 

 such times, when it allows the green to show partly 

 through, and to glisten slightly at the divisions and 

 increase the soft lustre of the black spots ; when, 

 however, the larva shortens itself and the skin shrinks, 

 it obscures the green beneath, much as the skin of a 



