INHERITANCE OF VARIATES IN THE ARMADILLO 167 



considerable portion of the mothers in my collection 'K' were 

 skinned and prepared for shipment in my absence and the tails 

 were cleaned in such a fashion that an accurate scute count could 

 not be made. It has been possible, however, to get together a 

 collection of 40 sets (20 male and 20 female) in which the mothers 

 had normal and uninjured tails and these constitute a sufficiently 

 large collection for our purposes. 



The number of well-defined caudal rings varied from 10 to 13 

 and is usually 11 or 12, most frequently the latter. For conven- 

 ience, and because several specimens have no more than 10 rings, 

 I have chosen to deal with only the first ten rings in all cases, just 

 as in the banded region the first nine bands were always taken for 

 tabulation although some specimens showed a tenth band. Al- 

 though there are three rows of scutes to a band in some bands and 

 only two or one in others, there is only one large prominent row 

 bordering the posterior margin of each band. This is the only 

 row counted for a ring. Scute counts, ring by ring, are given in 

 table 2. 



1. POLYEMBRYONIC CORRELATIONS IN THE CAUDAL ARMOR AS A 



WHOLE 



As was done in the case of the nine movable bands taken as 

 a whole, I shall deal first with the total number of scutes in the 

 caudal region. As before only the bare outline of the calculations 

 is presented. 



a. Correlation for the total number of scutes in the 10 tail rings 

 for 20 sets of male quadruplets {78 individuals) 



Mean = 166.6 scutes 



ax = 6.072; ax' = 36.87 



(TV' = 7.728 



Substituting, we get: 



1 7 700 



r = 1 -± i^lf2 = 0.8939 ± 0.013 



2 36.87 



