The Larva and the Nymph | loi 



upper part of the groove separating the meso- 

 thorax and the metathorax ; and, twenty-four 

 hours later, the whole back of the metathorax 

 is black. At the same time, the edge of the 

 prothorax becomes shaded, a black dot appears 

 in the central and upper part of the metathorax, 

 and the mandibles assume a rust}^ tinge. 

 Gradually a deeper and deeper shade creeps 

 over the two end segments of the thorax and 

 finally reaches the head and the hind-quarters. 

 A day is enough to turn the smoky hue of the 

 head and of the end segments deep black. 

 Thereupon the abdomen begins to share in the 

 rapidly-increasing coloration. The edge of its 

 front segments is tinted saffron ; and its hinder 

 segments acquire a dull-black border. Lastly, 

 the antennae and legs, after passing through 

 darker and darker shades, turn black ; the 

 lower part of the abdomen is now entirely 

 orange-red and the tip black. The livery is 

 complete except for the tarsi and the mouth- 

 parts, which are a transparent red, and the 

 wing-stumps, which are dull black. In four- 

 and-twenty hours the nymph will burst its 

 fetters. 



It takes the nymph only six or seven days 

 to don its final tints, omitting the eyes, whose 

 colouring precedes that of the rest of the body 

 by fourteen or fifteen days. The law govern- 



