28 University of California Publications in Zoology [Vol. 21 



branches of premaxillae ; the latter extend as far as or beyond plane of 

 lacrimals. Vertical diameter of anterior narial opening equal to or 

 exceeding transverse diameter. Anteorbital foramen normally high 

 and narrow. 



Occiput uniformly convex, the median depth equal to about 59% 

 of greatest width across lambdoidal ridge of brain-case. Foramen 

 magnum subtriangular, but somewhat flattened. Paroccipital pro- 

 cesses directed more backward than downward, but their tips may or 

 may not be applied to the bullae ; their posterior margins continued 

 upwards as sharp crests. Floor of brain-case not differing in any 

 essential detail from that in other races of calif ornicus; median ridge 

 present and width of basi occipital at suture between it and ba si- 

 sphenoid more than one-third of its median length. Auditory bullae 

 small, with more marked depression below meatus than in mariposae 

 and mohavensis. Posterior border of bullae obliquely truncated and 

 somewhat indented. 



Palate narrow, with shallow palatine sulci and depressed median 

 ridge. Lateral pits fenestrated. Interpterygoid fossa narrow, the 

 hamular processes of pterygoids rapidly diverging. Incisive foramina 

 long and narrow, with portion slightly posterior to middle expanded. 



Anterior portion of zygoma strongly diverging; median portion 

 almost parallel with main axis of skull ; upper surface of maxillary 

 arm of zygoma narrower than in either mariposae or mohavensis. 

 Jugal normally expanded and shallowly mortised into maxillary part 

 of zygoma. Zygomatic arches slightly notched at anterior junction 

 with premaxillae. 



Mandible smaller than that of mohavensis. Ridge for masseteres 

 laterales well developed. Coronoid process long, its base broad, its 

 extremity rising above level of the condyle. Angular process stout, 

 curved outward but with posterior border not extending as far as 

 plane of condyle. Peripheral swelling over base of incisor marked by 

 conspicuous tuberosity which lies for the most part within the masse- 

 teric ridge. Base of mandibular foramen situated slightly above cut- 

 ting surface of last lower molar. Mental foramen situated on lateral 

 face below superior surface of diastema. 



Teeth. — Though in general resembling those of californicus, the 

 transverse loops are relatively shorter and less flattened. An internal 

 lobe generally present on posterior triangle of M-. The enamel fold- 

 ing of M- is without any especial peculiarity. 



First lower molar with deep internal and external reentrant angles 

 which are approximately equal. Transverse loops crescentic. 



Remarks. — This light colored race inhabits a region of dry and 

 (in summer) warm air. Specimens from the vicinity of Fort Tejon 

 are best referred to this form though in certain cranial characters 

 they approach closely to neglect us. Intergradation between kernensis 

 and neglectus occurs around Piru Creek and Mount Pinos. A speci- 

 men from Bakersfield is darker than the average but nevertheless 

 belongs with Jcernensis. 



It is of peculiar interest that three other unrelated forms of 



