286 KELLOGG AND BELL 



This variation also is perfectly continuous, every possible 

 (visible) gradation between a distinct spot at some distance 

 from the upper cross band and the broad, short vertical bar, 

 ranging through a distinct spot connected by the barest thread- 

 line, a spot connected by a thicker line and so on to the short 

 bar no wider at its free (spot) end than at its middle. 



To ascertain if any correlation exists between the variation 

 in the face marking and that in the abdominal pattern, the lot 

 of 496 individuals examined and arranged in respect to abdom- 

 inal pattern was also arranged within the classes established on 

 a basis of variation in abdominal pattern, on a basis of variation 

 in face markings, with the following result : 



Class A: 71 individuals with both black spots of abdominal 

 segment 2 free from anterior black transverse bar (fig. 54 A). 

 Subclass i : 46 (of Class A) have the face spot free and sub- 

 circular (fig. 55 A). 



Subclass 2 : 4 (of Class A) have the face spot free but elon- 

 gated and nearly attached. Subclass 3 : 19 (of Class A) have 

 the face spot narrowly attached (fig. 55, .Z?). Subclass 4 : i 

 (of Class A) has the face spot broadly attached (fig. 55, C). 



Class B : 22 individuals with the left spot of abdominal seg- 

 ment 2 free and the right one attached (fig. 54, J?). Subclass i : 

 10 (of Class B) have the face spot free and subcircular (fig. 55 

 A). Subclass 2 : 2 (of Class B) have the face spot elongated 

 and nearly attached. Subclass 3 : 8 (of Class B) have the face 

 spot narrowly attached (fig. 55, .Z?). 



Class C : 7 individuals with the right spot of abdominal seg- 

 ment 2 attached, the left one free (fig. 54, C). Subclass i : 6 

 (of Class C) have the face spot free (fig. 55, A). Subclass 2 : 



1 (of Class C) has the face spot narrowly attached (fig. 55, J3). 

 Class D : 41 individuals with both spots of abdominal seg- 

 ment 2 attached by a very narrow stem (mere line) (fig. 54, D), 

 of which all have both spots of abdominal segment 5 attached, 

 either by a narrow or broad line. Subclass i : 20 (of Class D) 

 have the face spot free and subcircular (fig. 55, A). Subclass 



2 : i (of Class D) has the face spot elongated and nearly at- 

 tached. Subclass 3 : 20 (of Class D) have the face spot nar- 

 rowly attached (fig. 55, .#). 



