880 H. H. NEWMAN AND J. THOMAS PATTERSON 
that the degree of correlation found to exist in the banded region © 
has its parallel in other regions; in fact some of the results already 
obtained seem to indicate the existence of higher degrees of cor- 
relation than any yet determined. 
E. Fraternal correlation in the ~ndividual bands 
In one of our previous papers (’10) we had occasion to refer 
to the subject of pairing in the following words: 
In this connection it should be mentioned that even where there is 
exact resemblance between the individuals of a pair in the total num- 
ber of scutes in the nine bands of armor, there is no perfect correspond- 
ence with respect to individual rows. The resemblance in total numbers 
of scutes is, however, a matter of more importance than the exact man- 
ner of their arrangement into rows, which is a secondary process. 
Further investigation has thrown light on this situation and 
we are now in a position to make a more satisfactory statement 
of the conditions referred to. By the application of statistical 
methods we have been able to compare the strength of hereditary 
control exercised over the total scute number and that over the 
arrangement of these scutes into bands. In order to do this it 
has been necessary to determine the correlation coefficient of 
each of the nine bands, using the same method which was applied 
to the whole banded region. The method pursued is illustrated 
in the case of band 1 (table 9). The same method of procedure 
was carried out for each of the nine bands and the data and results 
are seen in concise tabular form in table 10. 
Although the average coefficient of correlation for the individ- 
ual bands is high as compared with that found for any relation 
other than an intra-individualistic one, it is decidedly low as 
compared with that shown to exist in the case of the total number 
of scutes in the whole region. This would seem to indicate that 
there is here a much wider scope for the operation of epigenetic 
factors. Evidently the alignment of scutes to produce the bands 
is, to a large extent, a mechanical process, involving a certain 
amount of shifting due to pressure, etc. In the earliest stages of 
scute formation it is probable that the primordia of these elements 
are arranged somewhat after the fashion seen in the abdominal 
