:microjiys 



843 



witlioiit special pL'tailiai'ities ; a sliglitly indicated transverse 

 ridge at level of posterior border of last molar ; mesopterygoid 

 space beginning about 1 mm. behind this ridge, much narrower 

 anteriorly than posteriorly, its margins straight to tip of hamular, 

 which is barely or not in contact with auditory bulla. Mandible 

 essentially like that of Apodevtiis niilnaticun, but with barely 

 indicated swelling over root of incisor, more concave upper 

 margin of angular process, and coronoid more abruptly hooked 

 backward. 



Teeth. — General character of teeth much as in Ai)ii(lc)iius 

 xylvaticns, but upper incisor perhaps a little more compressed 

 and root of lower incisor scarcely forming an appreciable 

 protuberance on outer side of mandible. Relative size of upper 

 molars more nearly as in Apoclemus sijlraficus than as in 

 A. (ujrnr'ms, but outline of m^ intermediate between that in 

 these two species. Inner and outer tubercles about equal in size. 

 First upper molar with anterior crescent 

 somewhat distorted, <3 well developed 

 though closely crowded against t'2, t\ some- 

 what posterior in position, the three tuber- 

 cles less contrasted in size than in the species 

 of Ajyodciaus ; no intermediate folds in 

 narrow angles between bases of tubercles, 

 but a rather well defined ridge from ^1 to 

 inner base of /5 ; /6 very large, filling nearly 

 the entire space occupied by it and /9 in 

 Apodemus siilvaticus : td reduced to a mere „. "^' '.' , 



rudiment at posterior base of /6 ; postei'o (.;iieek-teetu. x lo. 

 external margin of crown with slight thick- 

 ening of the enamel as in AjMdciims sylvaticiis ; /S and tl showing 

 no special peculiarities. Second upper molar with first crescent 

 represented by a minvite though evident to and a small tl ; second 

 crescent with simple t6 about ecjual in size to <4 ; third crescent 

 with barely indicated td and small /7. Third upper molar much 

 as in Aimdcmus si/lvaticus, its crown showing traces of tubercles 

 1, 4, 5, 7 and 8. Maxillary molars as in Apodemus sijhnticus, 

 but outer ledge of m^ and m., slightly developed and without 

 evident cusps. 



Bemarks. — Two well marked races are recognizable among 

 the harvest mice of western Europe. True Micruiinjs minutus is 

 aj^parently not found in this region. 



KEY TO THE EUROPEAN FORMS OP MICBOMYS MINUTUS. 



Head and shoulders reddish brown, essentially 



coucolor with back (England and western 



continental Europe) -V. minutus t:orkinus, p. 844. 



Head and shoulders greyish, noticeably contrasted 



with reddish brown back (Hungary and Rou- 



niania) -i/. >n. pratensia, p. S4G. 



