236 NEW YORK STATE MUSEUM 



12 Direct superior aspect of the skull ofCallipepla squa- 

 ma t a ; mandible removed ; the same specimen as shown in plate 

 I, figure 1. 



13 Direct left lateral aspect of the cranium of Colinus vir- 

 gin i a n u s . All the bones removed save the two nasals, and 

 these are somewhat tilted up from their normal positions. 



14 Superior view of the cranium of a large male specimen of 

 Centrocercus urophasianus. All the bones of the 

 skull, including the mandible have been removed, save the nasals and 

 premaxillary, and these latter are articulated in situ. A lateral view 

 of this skull is given in my Osteology of the Tetraonidae with other 

 bones of the skeleton [Hayden's 12th An. Rep't, p. 704, pi. 6, fig. 52]. 



15 Direct superior aspect of the skull of Centrocercus 

 urophasianus (subadult, " bird of the year "). Mandible 

 removed. Shows very well the sutures among the cranial and facial 

 bones, and the foramen corresponding to the " posterior fontanelle " 

 of human anatomy. A lateral view of this 'skull is given in my 

 Osteology of the Tetraonidae, with other bones of the skeleton 

 [U. S. Geol. & Ueog. Sur. Terr. Hayden's 12th An. Rep't, 1883. pt 1, 

 p. 702, pi. 5, fig. 50]. The skulls of the Sage cocks shown in this 

 figure and figure 14 were collected by the author in Wyoming in 



r8 79 . 



16 Basal aspect of the skull of Centrocercus uropha- 

 sianus ; mandible removed. From a large female specimen col- 

 lected by the author in Wyoming ir» ° 9. 



17 Basal aspect of the skull Lophortyx gambeli; 

 mandible removed. Same spec' m as shown in plate 1, figure 4: 



18 Basal view of the sk< of Phasianus c o 1 c h i c u s . 

 Same specimen as shown in plate 1, figure 6 of this bulletin. Man- 

 dible removed. 



19 Basal view of tb - ^kull of Argus giganteus. Man- 

 dible removed. S..ne specimen as shown in plate 1, figure 11, of 

 this bulletin. 



