iOlO.] VARIETIKS Ol" MUS RATTKS IX KOVrX. fi59 



Tuxt-.'i.ii-. ()0. 

 Length of Hind foot in mm. 

 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 



<3 





o 



e 

 3 



^ 



T.MiLE III. 



("ui've of himl-foot measurements of Mus rattus alexandrinus [Groiijis iii. & iv.]. 

 (X.I?.— Tables II. & III. arc represented together in Table I.) 



Tables II. and III. (text-figs. 59 & (50) show the curves of 

 ^[. r. tectorum and M. r. alexaudriuus taken separately. In the 

 first table I have included all the rats which would fall umlei- 

 groups (i.) and (ii.), and in the second those included in 

 <^roups (iii.) and (iv.) (see ante, p. 655). 



The tectoriom males show apices at 31 and '^o iniii. with ;i .slight 

 check at 33, and the females at 30 and 35 with a slight check at 

 32-33. In (dexandriniis the males show apices at 29 and 33 with 

 a slight check at 35, and the females a. slight apex at 33 with a 

 large one at 35. There were no females of ahxAindrinus below 

 30, which accounts for the absence of the first apex. 



This comparison makes it very clear that the apices in the 

 general curve (Table 1., text-fig. 58, p. (i57) are not merely due 

 to accident, but that the middle one at 33 represents the variety 

 known as (dexandriin's, and the largest oiie at 35 represents 

 the white-bellied tecioraiti. I'lie fact of the curves in Tables II. 



