274. =Semipalmated plover.= ÆGIALITIS SEMIPALMATA. Migrant, not common; breeds near the Arctic Circle. 281. =Mountain plover.= ÆGIALITIS MONTANA. Common summer resident; in spite of its name, a bird of the plains rather than the mountains; yet sometimes found in parks at an altitude of 8,000 and even 9,000 feet. Its numbers may be estimated from the fact that in one day of August a sportsman shot one hundred and twenty-six birds, though why he should indulge in such wholesale slaughter the author does not understand. 283. =Turnstone.= ARENARIA INTERPRES. Rare migrant; breeding grounds in the north; cosmopolitan in range, but chiefly along sea-coasts. 289. =Bob-white.= COLINUS VIRGINIANUS. Resident; somewhat common locally; good reason to believe that all the quails of the foothills are descendants of introduced birds, while those of the eastern border of the plains are native. A few were introduced some years ago into Estes Park, and are still occasionally noticed. 293. =Scaled partridge.= CALLIPEPLA SQUAMATA. Resident; common locally; southern species, but more common than the bob-white at Rocky Ford, Col. 294. =California partridge.= LOPHORTYX CALIFORNICUS. Resident, local; introduced at Grand Junction, Col., and have flourished so abundantly as to become troublesome to gardeners. 295. =Gambel's partridge.= LOPHORTYX GAMBELII. Resident, rare; known only in southwestern part of the State; a western species. 297. =Dusky grouse.= DENDRAGAPUS OBSCURUS. Resident; mountain dwellers; breed from 7,000 feet to timber-line; in September wander above timber-line to 12,500 feet, feeding on grasshoppers; remain in thick woods in winter. 300b. =Gray ruffed grouse.= BONASA UMBELLUS UMBELLOIDES. Rare resident; a more northern species, but a few breed in Colorado just below timber-line; winters in higher foothills. 304. =White-tailed ptarmigan.= LAGOPUS LEUCURUS. Common resident; one of the most strictly alpine species; breeds entirely above timber-line from 11,500 to 13,500 feet; thence ranging to the summits of the highest peaks. Only in severest winter weather do they come down to timber-line; rarely to 8,000 feet. In winter they are white; in summer fulvous or dull grayish-buff, barred and spotted with black. This bird is colloquially called the "mountain quail." The brown-capped leucosticte is the only other Colorado species that has so high a range. 305. =Prairie hen.= TYMPANUCHUS AMERICANUS. Resident; uncommon and local. 308b. =Prairie sharp-tailed grouse.= PEDIOECETES PHASIANELLUS CAMPESTRIS. Resident, not common; once common, but killed and driven out by pothunters; some breed in Middle Park; noted in winter at 9,500 feet. 309. =Sage grouse.= CENTROCERCUS UROPHASIANUS. Common resident. "As its name implies, it is an inhabitant of the artemisia or sage-brush plains, and is scarcely found elsewhere." Ranges from plains to 9,500 feet. 310. =Mexican turkey.= MELEAGRIS GALLOPAVO. Rare local resident; southern part of the State.