112 Prof. E. W. MacBride and Miss A. Jackson. 



The Adult Male. 

 Amongst 3000 insects bred seven males were found. 



The male insect is about the size which the female attained at the fifth 

 moult. Its sexual ripeness is indicated by a blush of scarlet on the under 

 surface of the meso- and meta-thorax ; there are also two narrow lines of 

 scarlet on the dorsal surface of the metathorax. The ground colour of the 

 specimen shown in fig. 2 is greyish olive. Another male had a ground 

 colour of greenish yellow and the abdomen was suffused with pure yellow. 

 In such a small collection it is naturally impossible to say how many colour 

 varieties of male exist, but obviously there must be at least two. The 

 abdomen has the characteristic shape found in the males of Orthoptera. 



The Just-hatched Insect. 



So far as our observations go, all insects when they emerge from the egg 

 are alike, whatever colour they may afterwards assume ; Meissner, it will be 

 remembered, described them as green, and de Sinety as being " d'une 

 couleur fuligineuse." Neither description is correct. The insect on hatching 

 has a definite colour pattern. The mid-dorsal line is occupied by a fine 

 green band, very narrow on the head, but widening as it proceeds backwards 

 until it is fairly wide in the region of the abdominal segments and a con- 

 striction between two adjacent segments is observable, so that the patches of 

 greenish-yellow copy in shape the underlying chambers of the heart. At 

 the sides of this median band are two bands of brown, very wide in the 

 region of the head but narrowing as they proceed backwards until they 

 become linear in the abdomen. These bands are bounded laterally by pale 

 green streaks. Then on the lateral edges of the segments there is another 

 brown band, broad on the head region where it crosses the eye and becoming 

 narrower as it proceeds backwards (see fig. 4). The ventral surface is 

 yellowish-green, becoming more and more mottled with brown as one 

 proceeds backwards till in the last three segments of the abdomen the green, 

 has disappeared. 



Changes of Colour as Development Proceeds. 



If the insect be one of the pure green variety the brown bands become 

 more and more broken up into mottling; and often when the first moult has 

 taken place the insect is nearly pure green, although the brown band on. 

 each side of the head could still be made out. No abrupt change of colour 

 takes place at the moult itself, because, as we have already seen, the pigment 

 granules are situated in the ectodermal cells : the cuticle is practically 

 colourless. In one special instance noted, an insect hatched on May 7 as the: 



