QQ 



BULLETIN OF THE ESSEX INSTITUTE. 



for the posterior. No general lumbar index among the 

 females exceeds 99.2, while the minimum index is 97.5, 

 a remarkably narrow range of variation. Curiously 

 enough the average of the sums of the anterior measure- 

 ments in the females, 138 mm., exceeds by a single 

 millimetre the average sum of the anterior measurements 

 of the ten males. The posterior average in the female is 

 136 mm. ; the range of variation being 131 mm. to 148 

 mm., and 127 mm. to 146 mm., for the anterior and 

 posterior sums respectively. 



IV. Peru : 



1. ANCON. TABLE XI. ELEVEN MALES, EIGHT FEMALES. 



In this table for the first time the average of the 

 special indices of the 4th vertebra in the males falls 

 considerably below 100. Eight of the indices are ex- 

 actly 100, one is 92.3, another 96 and the other one 

 104.1. The averages of the sums of the measurements 

 of the lumbars in this group of skeletons falls below any 

 so far recorded in this paper. This is what might be ex- 

 pected from the fact that the coast tribes of Peru were of 

 very short stature. In fact some of those of the south 

 of Peru may almost be called dwarfs. The average of 



