. The Canadian field-naturalist. 1978 Weller et al.: Ambystoma jeffersonianum Complex, Ontario 177 â E I Bruce Co. y^ â¼ Lincoln Co. A Brant Co. :: Corleton & Russell Co 9 York Co., near Toront ^ Northumberland Co. I I Middlesex Co. A York Co. V Findlay,Ohio O Victoria Co. (5754. A. trem A. laterale 50 60 70 80 90 100 Snout-vent Length (mm) Figure 2. Relationship of internarial width to snout-vent length for preserved females of the A. Jeffersonianum complex from museum collections. The margins of the clouds of points for the four species are ba
. The Canadian field-naturalist. 1978 Weller et al.: Ambystoma jeffersonianum Complex, Ontario 177 â E I Bruce Co. y^ â¼ Lincoln Co. A Brant Co. :: Corleton & Russell Co 9 York Co., near Toront ^ Northumberland Co. I I Middlesex Co. A York Co. V Findlay,Ohio O Victoria Co. (5754. A. trem A. laterale 50 60 70 80 90 100 Snout-vent Length (mm) Figure 2. Relationship of internarial width to snout-vent length for preserved females of the A. Jeffersonianum complex from museum collections. The margins of the clouds of points for the four species are based upon females of known identity presented in this paper and in Uzzell (1964). Solid symbols represent specimens for which the identit\' could be deduced; hollow symbols, those for which the identity could not be made. Numbers associated with hollow symbols refer to ROM catalogue numbers. Females of this species were collected from five localities in Wentworth, Halton, and Peel Counties (Figure 3A, solid circles). They have slightly longer tails (Figure 4A) and larger erythrocytes than female A. Jeffersonianum from southern populations (Figure 4B). Males were collected from four localities in Wentworth, Halton, and Peel Counties (Figure 3B). They have considerably longer tails than do males from southern populations; the erythro- cytes, however, are typical of diploids in size (Figure 4B). No triploid males were identified among Ontario specimens. The distribution of .4. Jeffersonianum in Ontario is thus extended to include two new counties (Wentworth and Halton) and four new localities. The precise taxonomic status of several Ontario females of this complex in the Royal Ontario Museum identified as A. Jeffersoni- anum cannot be determined with certainty. Three specimens (ROM 1472, 1473. and 1474) are from Middlesex County, five (ROM 54, 55, 1015. 4000. and 5006) are'from York County, and one (ROM 5754) is from Victoria County. On the basis of snout width alone, it is temp
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