The Anatomy of Oinsthopatiis cinctipes. 97 



(1894), and with that of the terra-cotta paper covers in which the 

 parts of these Annals are bound. This colour varies from a hghter 

 to a darker terra-cotta, according to the amount of blaclf or dark 

 green mixed with it, and I formerly described it as orange-brown, 

 orange-red, or even orange, according to tint, while Sedgwick called 

 it brown, reddish brown, and red-orange. Oakley (1884, p. 35) used 

 the more correct term, " dusky brick-red," as well as brown. 



In living forms many variations of colouration occur, but these 

 may be generally grouped under four principal heads as follows : — 



(1) Brick-red forms.- — Sides and upper surface of the trunk of the 

 body appear of a brick-red (terra-cotta) colour to the naked eye, the 

 lateral band above the legs on each side being of a paler and purer 

 brick-red than the rest of the dorso-lateral surface, in which a certain 

 amount of dark pigment (absent in the light lateral bands) is mixed 

 with the red, without, however, forming conspicuous black lateral 

 stripes (moseleyi, capensis, cinctipes). 



(2) BricTc-recl forms luith lateral black stripes. — Trunk of body as 

 in the brick-red form, excepting that there is a larger amount of 

 dark pigment forming a conspicuous black (or dark green) stripe of 

 varying width on each side just above the light lateral band [moseleyi, 

 capensis, sedgivicki, cinctipes). 



(3) Black or dark green forms ivith red sides. — Black pigment still 

 more plentiful than in the last form, completely obliterating the red 

 stripes of the dorsal surface proper ; only the light lateral bands 

 above the legs pale brick-red, the rest of the dorso-lateral surface of 

 the trunk of body black or dark green but pi'ovided with numerous 

 large reddish papilla, evenly scattered about amongst the black ones. 

 An excellent figure of this type is given by Sedgwick (18886, pi. 17,. 

 fig. 8) {moseleyi, capensis, sedgivicki, cinctipes). 



(4) Black or dark green forms — Whole dorso-lateral surface dark 

 green or black, the lateral band on each side above the bases of the 

 legs paler and more distinctly green ; red pigment of the dorso- 

 lateral surface limited to the larger papillae ; these red papillae either 

 distributed over both the dorsal and lateral surfaces, often forming 

 more or less distinct transverse and longitudinal rows (balfouri, 

 leonina, clavigera, capensis piv., cinctipes), or the red is less 

 developed or even entirely absent in the strictly dorsal papillae, and 

 principally or entirely confined to those on the sides, especially those 

 in the light suprapedal bands [moseleyi, capensis) ; red pigment rarely 

 entirely absent [moseleyi, capensis, balfonri). In these dark pig- 

 mented specimens reddish tinges are sometimes observable in the 

 living animals, due to the presence of much soluble red pigment. 



