222 The Inheritance of Wing Colour in Lepidoptera 



second black stripe runs from the middle of the shoulder knot towards 

 the third marginal spot, which it may or may not reach, leaving one or 

 two small wedge-shaped areas of yellow or white in the centre of the 

 wing. (See Plate IX, No. 16.) The different lengths of this black 

 stripe have been indicated in the following way : 



nigricostata signifies costa black as far as discoidal spot. 

 „ / signifies costa black as far as orange fascia. 

 „ // signifies costa black as far as the apex of the wing. 

 „ /// signifies second black stripe running more or less 

 completely across the wing. 

 Var. hazeleighensis. 



(See Plate IX, No. 30.) Fore wings almost filled with black except 

 for small white specks in the middle of the costal margin. The hind 

 wings are sometimes banded, but are often unaffected. This variety 

 frequently occurs in the cross varleyata x grossulariata. 



Var. nigrocincta. 



(See Plate IX, Nos. 16 and 30.) This variety has not been pre- 

 viously described. It is caused by the dorsal spots being extended 

 round the body so as to form black rings. In some specimens the body 

 may be almost entirely black. The variety seems sometimes to be 

 correlated with the amount of black pigment on the wings, but this is 

 not always the case, because the dorsal spots in many specimens of 

 varleyata are quite normaP. 



The degree of pigmentation is indicated in the following way : 



nigrocincta + signifies black rings incomplete. 

 „ /f signifies black rings complete. 



„ -h+i signifies dorsal area entirely black. 



In some insects the black rings are only found on certain abdominal 

 segments. In these cases the correct segments are indicated in brackets, 

 just below the variation on the distribution figures. 



Var. violacea and var. semiviolacea. 



(See Plate IX, Nos. 11 and 27.) Either all four wings or only one 

 pair may be sufi'used with a purplish brown bloom that gives the insect 

 a scorched appearance. Under the microscope the pigment is seen to 

 be purple, and evenly distributed over the surface of the scales, which 

 have a faintly mottled appearance. Otherwise it strongly resembles 

 the suffusion of iochalca {vide infra). 



1 Compare the insect illustrated by Bowater (see note p. 221). 



