134 CHARLES MIDLO AND HAROLD CUMMINS 



Summating the regional pattern intensities representing 

 each of these groups, comparisons are to be drawn first be- 

 tween the thenar and hypothenar groups in the same member. 

 Comparisons are made in terms of the percentile relation of 

 the intensity in each group to the intensity of the two groups 

 combined, this last being an adjusted total intensity, differing 

 from the total intensity previously considered in that inter- 

 digital III is excluded. In presenting these figures in graphic 

 form (fig. 600), the differences between the percentile values 

 of the thenar and hypothenar groups are plotted above the 

 base line or below it in accordance with whether the excess 

 is in the thenar group or in the hypothenar. 



Perhaps the most striking finding in this comparison is the 

 close parallelism between hand and foot existing in all the 

 prosimians (except Tarsius, which as in many other dermato- 

 glyphic comparisons has been shown to be an erratic member 

 of its group) and in New World monkeys; lesser similarity 

 between hand and foot is presented in Old World monkeys, 

 and there is a sharp increase of unlikeness in gibbon, great 

 apes and man. 



The values for relative intensities of the thenar and hypo- 

 thenar groups may be reduced to average values for all non- 

 human primates. Though it is impossible at the present time 

 to disclose the factors responsible for intergeneric variations 

 in the intensities of the two groups, it is of importance to 

 note that the collective trend revealed in the average is 

 equality of these groups. The adjusted total intensity of the 

 palms in the 22 non-human genera averages 3.49 (interdigital 

 III being omitted, as pointed out above). The average in- 

 tensity of the palmar hypothenar group is 1.74 and that of 

 the thenar group, 1.75. Figure 600 shows in contrast that 

 the tendency in the sole is toward higher pattern intensity 

 in the thenar group. The average intensities of the plantar 

 hypothenar and thenar groups in the 22 non-human genera 

 are 1.52 and 1.29 respectively. In the human palm there is 

 a marked departure from the average trend, the intensity of 

 the hypothenar group being .69 and that of the thenar group 



