158 



Dwight on the Horned Larks. 



[April 



KEY TO YOUNG IN FIRST PLUMAGE. 



A. Black and white above. 



a. Spotting whiter. 



b. Spotting more buffy. 



B. Dark brown above. 



a. White below, heavily spotted on breast. 



b. Yellow-tinged throughout, less spotted. 



c. [Probably similar to alpestris']. 



C. Pale brown above. 



a. Darker and grayer. 



b. Paler and browner. 



c. [Probably similar to arenicola.] 



D. Reddish brown above. 



a. Dark. 



b. Ruddy. 



c. Pale. 



merrilli- 

 leucolama. 



praticola . 

 alpestris. 

 strigata. 



giraudi . 



arenicola. 



pallida. 



chrysol&ma. 



rubea. 



adust a. 



TABLE OF MEASUREMENTS (iN MILLIMETERS). 



*Culmen averages about one fifth larger. 



Wing measurement is chord from carpal joint to end of first primary. 



Tail measurements is from insertion of two central rectrices to end of longest. 



