DERMATOGLYPHICS IN PRIMATES 131 



The second inter digital area (II) has an average intensity 

 of 0.50. The highest values occur in Galago, 1.00; Alouatta, 

 0.76; Aotus, 0.85; Papio, 0.93; Pithecus, 0.79; Cercocebus, 

 0.80; Lasiopyga, 0.88; Erythrocebus, 0.87. Low values occur 

 in Tarsius, 0; Ateles, 0.29; Lagothrix, 0.24; Cebus, 0.05; 

 Hylobates, 0.11; Symphalangus, 0.11; Pongo, 0.34; Gorilla, 

 0.05; Pan, 0.14. The remaining non-human genera approxi- 

 mate the average value, while man presents a relatively low 

 intensity, 0.27. 



The third inter digital area (III), with an average of 0.42, 

 shows the highest intensities in Lasiopyginae and in Galago, 

 ranging from 0.70 to 1.00. Extremely low values are to be 

 found in Tarsius, ; Nycticebus, ; Callithrix, ; Ateles, 0.11 ; 

 Hylobates, 0.5 ; Symphalangus, ; Pongo, 0.17 ; Pan, 0.8. Man 

 presents the high value of 0.61. 



The average value for the fourth inter digital area (IV) is 

 0.64, the highest of the plantar areas. Very low pattern in- 

 tensity is found in Tarsius, ; Hylobates, 0.10 ; Symphalangus, 

 0.11. With the exception of great apes (Pongo, 0.41; Gorilla, 

 0.38; Pan, 0.38), all other non-human genera show a high 

 pattern intensity. In man the intensity value is low, 0.17. 



Comparison of palm and sole. The reversal of intermembral 

 relations of pattern intensity in man as compared to non- 

 human primates, total intensity being greater in the human 

 sole than in the palm, calls for intermembral comparisons of 

 intensities in single conngurational areas. 



As shown in figure 598 there are two areas (H d and Th) 

 which in the non-human forms are exceptions to the rule of 

 higher pattern intensity in the hand, though in neither case 

 is that exception consistent throughout the series of genera. 

 Likeness of intensity values in corresponding configurational 

 areas in the hand and foot of the same genus is especially 

 evident in the interdigital series, most marked in IV, less 

 so in II and III. In figure 598 it will be noted that palm and 

 sole in the succession of genera tend to rise or fall together in 

 pattern intensity, hence giving a general effect of parallelism 

 even in those areas presenting wide differences in the absolute 



