1874.] 63 [Allen. 



CUCULIDJE. 



71. Coceygus americanus Bon. Yellow-billed Cuckoo. 

 This species was several times observed along Heart River and 



either this or C. erythropthalmus in the valley of the Yellowstone. 

 Dr. Hayden speaks of having both species in his Nebraska collections. 1 



PICID.ZE. 



72. Picus villosus var. Harrisi All. Hairy Woodpecker. 

 Occasional in the forests of the Yellowstone and Musselshell. 



73. Picus pubescens var. Gairdneri Coues. Downy Wood- 

 pecker. 



More or less frequent along the more heavily wooded portions of 

 the streams, from the Missouri to the Musselshell. 



74. Sphyrapicus varius var. nuchalis All. Yellow- 

 bellied Woodpecker. 



Seen only on the Musselshell, where several specimens were taken. 



75. Melanerpes erythrocephalus Swain. Red-headed 

 Woodpecker. 



Abundant everywhere from the Missouri to the Musselshell, far 

 outnumbering all the other Picidce together. 



76. Colaptes " auratus." Yellow-shafted Flicker. 

 Obtained in the vicinity of Fort Rice, and seen occasionally west- 

 ward to the Musselshell. 



77. Colaptes " mexicanus." Red-shafted Flicker. 



The most prevalent form of Colaptes, but by no means numerous, 

 and very hard to approach. On the Great Porcupine Creek I shot a 

 series of specimens that present a very interesting gradation from the 

 " mexicanus " to the " auratus " type. Throughout this region the 

 two forms associate together, and a considerable portion of them pre- 

 sent an interesting combination of the characters of the two forms. 



A female collected at Fort Rice is scarcely different from the usual 

 form of C. " auratus." A young male, collected on the Big Knife 

 River, also scarcely differs from the ordinary style of C. " auratus." 

 Other specimens, collected alpng the Yellowstone and Musselshell 

 Rivers, more or less strongly resemble the C. '' mexicanus" one of 

 them typically representing that form, while of the rest each presents 

 a different and intermediate stage between the two types. 



1 Trans. Am. Phil. Soc, xn, p. 155. 



