COLOR PATTERN OF EPICRANIUM. 



75 



From this table it is apparent that the range of variation is in every case 

 greater in the epicranium than in the pronotum ; but in most of the species 

 the variability of the pronotum is greatest a fact easily seen by comparing 

 the per cent of variates in the modal class ; that is, the epicranium shows 

 variates in more of the classes between the possible extremes of variation 

 than does the pronotum, but on the average in the group has the variates 

 less widely distributed. 



The color patterns of the pronotum and epicranium represent, the one a 

 complex and the other a simple condition, and it appears from the com- 

 parison of data in tables 19 and 20 that the simpler color pattern has the 

 greater range of variation, but lower variability. 



Variation in the color of the epicranium of the dilccta group. The epicra- 

 nium in the dilecta group, like the pronotum, shows only a uniformly colored 

 surface varying in intensity and in the same directions as the pronotum that 

 is, from red-brown to bright metallic green. These variations are not of 

 great moment, but such as occur are presented in the following table : 



Table 21. Variation in color of epicranium in L. calceata, L. dilecta, and L. lineolata. 



L. calceata: N. = 100 individuals. Mean of classes = 4. 78. 

 L. dilecta : N. = 100 individuals. Mean of classes = 4.85. 

 L. lineolata : N. = 300 individuals. Mean of classes = 3.89. 



Variation in the color of the epicranium of the haldemani group. As in the 

 dilccta group, a color pattern on the epicranium of the species of this group 

 is wanting, there being found only changes in color from a dull black to a 

 violet. The classes into which the material falls are the same in number as 

 are those of the pronotum given on page 71. 



Table 22 shows the variation found in this group. From a comparison 

 of this table with table 16, it is evident that there is a strong correlation 

 between the variations of the epicranium and pronotum. Other than this 

 correlation and the fact of the limitation of its variation to narrow lines and 

 very low variability, this group presents in the color pattern of these parts no 

 points of interest from the standpoint of individual variation. 



