74 



MONOGRAPHS OF NORTH AMERICAN RODENTIA. 



tawniest specimen we have ever seen from Washington Territory, and in this 

 respect exactly like some Massachusetts examples of leucopus. Color, then, 

 affording no data, and the matter of the cheek-pouches being already settled, 

 we are driven hack upon measurements alone to substantiate "boylii"; and 

 we conclude our argument with the following table, comment upon which is 

 unnecessary : — 



Table XVI.— Measurements of five specimens of fire "species" (so-called) of HusrEiiOMYS. 



Number. 



2778 



356 



1313 



1904 



10292 



Supposed species. 



Typical of leucopus 



Type of "boylii" 



Typical of " myoides". 

 Typical of "austerus". 

 Type of "gracilis" 



"Printed in M. N. A. "5.25" by typographical error. — A second specimen of "boylii" (No. 578) shows 

 longer tail, feet, and ears: — truuk, 3.08 ; tail, 4.08 ; sole, 0.95 ; ear. 0.75; while a third (,No. 810) has the 

 tail considerably shorter than the trunk (trunk, 4.00 ; tail, 3.65). Professor Baird remarks of this No. 

 810, that possibly it is "gambeli", and prints it also nnder "gambeli", with the remark, "possibly EL 

 boylii". It is, iu fact, just as much like one as like the other. 



t Probably about 3.50, but impossible to determine now, owing to the stretched and rat-eaten state 

 of the specimen. 



A series of alcoholic specimens from Cape Saint Lucas, the first exam- 

 ined, we believe, from this locality, oilers some interesting features. Although 

 it is not easy to judge of color in their present condition, they appear 

 to be light-colored, with the dorsal stripe of the tail very narrow, and 

 in this and other respects most of the series are undoubtedly referable to 

 "gambeli". A part of the series, however, shows an extraordinary length of 

 the tail — in this respect surpassing the most marked examples of "boylii" or 

 "myoides". In one specimen, the tail is nearly an inch and a half longer 

 than the head, and in this one, as well as the rest of those with the tail 

 decidedly longer than the body, this member is almost as naked as in a Mus, 

 and unicolor, of a dull-grayish hue. In all these, the dark color of the leg 

 extends on the base of the metatarsus — a feature shown distinctly even in a 

 suckling specimen. Although in their present state these specimens do not 

 show any appreciable difference in the body-colors from the "gambeli" com- 

 posing most of the series, we have little hesitation in referring them to the 

 //. aztecus. The length of tail of this species, it will be seen beyond, has 

 not been known; for all three of De Saussure's types had lost the tip of the 

 tail. Our type of aztecus, received from De Saussure, agrees precisely with 



