. The Canadian field-naturalist. 486 The Canadian Field-Naturalist Vol. 90 Table 1—Comparison of three cranial variates (in millimetres) of Microsorex from New Brunswick and Nova Scotia (1) and the rest of Canada (2) Sample Standard Coefficient of Observed Cranial variates size Mean deviation variability range Condylobasal length (1) 8 (2) 27 Length of unicuspids (1) 11 (2) 19 Length of P" (1) 11 (2) 20 1. We see that the observation
. The Canadian field-naturalist. 486 The Canadian Field-Naturalist Vol. 90 Table 1—Comparison of three cranial variates (in millimetres) of Microsorex from New Brunswick and Nova Scotia (1) and the rest of Canada (2) Sample Standard Coefficient of Observed Cranial variates size Mean deviation variability range Condylobasal length (1) 8 (2) 27 Length of unicuspids (1) 11 (2) 19 Length of P" (1) 11 (2) 20 1. We see that the observations of M. thompsoni lie entirely within the 95% equal frequency ellipse for M. hoyi. The observations for M. thompsoni are, with one exception, thoroughly interspersed among those of M. hoyi and the means for each of the subspecies show similar deviations from the major axis. It is obvious from the graphic comparison in Figure 1 that the ratio of cranial breadth to depth does not separate the two forms. To the contrary, the covariation of the two cranial variates suggests no difference between the two forms other than that of size. As to color, specimens from the Maritimes could not be separated from specimens from other localities in eastern Canada, including the Gaspe, on the basis. O M. hoyi © IVl. thompsor ''''''''' ' ' ' ' ' I ' ' ' CRANIAL BREADTH (MM) Figure 1. Covariation of cranial depth and cranial breadth in M. hoyi dind M. thompsoni. The ellipse represents the bivariate distribution of M. hoyi. It encloses an area in which 95% of all observations for M. hoyi are expected to lie. The slope of the major axis b - , the correlation coefficient between the variates r = Bivariate means for the different subspecies shown based in part on Long (1972), are as follows: A = ahiorum; E = eximius; H = hoyi:. M = montanus; W = washingtoni; T = thompsoni. The line below the major axis represents the cranial breadth to depth ratio, or its reciprocal (), claimed
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