REPORT OF COMMISSIONERS OF INLAND FISHERIES. 63 



in other areas, green or orange. Likewise the t>'pe designated 

 "green" is rarely wholly green, but shown many areas of red, brown, 

 or yellow. The red type is the ofily one which may be found alone 

 and constant without other color modifications with yellow^, green, 

 or brown. Such manner of constant red pigmentation may extend, 

 with no change, through several or many successive stages of de- 

 velopment. These other variations in color may occur, designated 

 in terms of yellow-green, green and red, or reddish-brown, orange- 

 red, but are to be considered as modifications of the three main types. 

 The pigmentation of the fourth larval stage manifests some points 

 which link it to the third, especially the pronounced red of the chelae, 

 the grouping of red chromatophores as in group (4), and the predomi- 

 nance of the olive-green along the sides of the abdominal segments. 

 The coloration during the latter part of the fourth stage, moreover, 

 anticipates to some extent the color of the succeeding stage, so that 

 it is not at all uncommon to find lobsters in the late fourth stage 

 which show a deepening browm color, wherein there may be seen 

 dimly light spots on various parts of the body and appendages, an- 

 ticipating again, in this feature, a peculiarity of the next, or fifth, stage. 

 Such anticipation of color is fairly common in the latter part of this 

 and later stages as the time of moulting draws near. 



COLOR CHANGES IN THE LATER STAGES. 



As has been already stated, in the fourth and later stages there is 

 never found the rapid and transitory color changes characteristically 

 exhibited in the first, second, and third larval stages. There usually 

 is, how^ever, some slight color change between the beginning of a cer- 

 tain stage and the end of the stage — a change which is generally 

 manifested as a darkening of whatever the color type may be, and 

 in a loss of detail in the color markings or patterns. This fact is one 

 which, developed at this period, holds true for all later stages, namely 

 a darkening in color as the time of moidting draws near. In spite 

 of this general fact there may occur a more or less sudden change 

 in the color of these later stages, although such cases are very rare 



y 



