1906.] Allen, Mammals fromWestern Mexico 203 



2 only are normal. The inflation of the bones forming the antero- 

 inferior wall of the orbit, through the invasion of these parts by some 

 parasite, is so general in the whole group of Peccaries that the absence 

 of such conditions seems to be almost exceptional. 



An enlargement of the frontal region in the skull of certain species 

 of the Mustelidas, especially in the Skunks, due also to a parasite, 

 is well known, but it is apparently less general than is this still more 

 striking pathological modification of the skull in the Peccaries, which 

 may also be well known, but to which I have thus far seen no reference. 



Three skulls from different localities in the State of Jalisco (see 

 below, under next article) average the same as the Escuinapa series, 

 and each can be exactly matched by skulls in that series. Four 

 skulls from Arizona, each much older than any in the Escuinapa 

 series, have the same average length but are much broader in nearly 

 all of the transverse measurements, due apparently to their greater 

 age. Old skulls from eastern Texas are slightly larger in all measure- 

 ments than even the old Arizona skulls, with decidedly heavier 

 dentition and greater postpalatal and basioccipital breadth. 



5. Odocoileus sinaloae Allen. 

 (PLATES XXI-XXVI.) 



One hundred and seven specimens, topotypes of the species, of 

 which about 70 are carefully prepared skins, mostly with good skulls, 

 and 35 are hunters' skins, 1 more or less imperfect. They represent 

 adults of both sexes, and young from six to eight months old and 

 upward to young adults. They were collected as follows: In Jan- 

 uary, 22 specimens; in February, 39 specimens; in March, 15 specimens; 

 in May, 8 specimens (3 are skulls without skins) ; in December, 2 

 specimens. The remainder are mostly hunters' pelts, generally with- 

 out date of collecting; the grea:e r part of them are winter specimens, 

 but several are in summer pe!?ige. 



"Ranges from the coast eastward to the second range of the 

 Sierra Madre. Most numerous in the wet season (July to November, 

 inclusive) in the mountains, returning in large numbers to the low- 

 lands and foothills of the coast region during the dry season. The 

 females have one and sometimes two fawns in June and July. This 

 species is a jumper, clearing high fences when in search of squashes 

 or bean vines, which they greedily devour." -J. H. B. 



1 The large series, especially of hunters' skins, is due to the fact that many deer were killed to 

 supply the camp, and also the natives of the vicinity, with meat, and the collector utilized the pelts 

 as specimens. 



