BIRDS OF ONTARIO. 55 



GENUS NUTTALLORNIS. 



(459) Olive-sided Flycatcher. 



(Nuttallornis borealis.) 



A regular but uncommon visitor to southern Ontario. I have found 

 one or two each spring for several years, but have not seen it at any 

 other season. It is said to be common and breed in the Muskoka and 

 Parry Sound Districts. 



GENUS CONTOPUS. 



(461) Wood Pewee. 



(Contopus virens.) 



Common summer resident, breeding in woods throughout its range 

 in the Province. 



Arrives about the middle of May, departs about the middle of Sep- 

 tember. 



GENUS EMPIDONAX. 



(463) Yellow=bellied Flycatcher. 



(Empidonax flaviventris.) 



A rather uncommon visitor. I have seen a few each spring, but 

 never later than June. 



It breeds regularly in the wooded parts of the interior. 



(466) Traill's Flycatcher. 



(Empidonax trailli.) 



The eastern form, E. t. alnorum, is a regular visitor, generally dis- 

 tributed, but never common. It frequents low grounds where alders and 

 willows flourish. Breeds in the interior. 



(467) Least Flycatcher. 



(Empidonax minimus. 



Common summer resident, breeding in orchards, shrubberies and 

 woodlands throughout its range in the Province. 



Arrives about the middle of May, departs at the end of August. 



SUBORDER OSCINES. (SONG BIRDS.) 

 FAMILY ALAUDID^E. (THE LARKS.) 



Tarsus obtuse and scutellate behind as well as in front. Bill short ; 

 nostrils concealed by tufts of antrorse feathers ; hind claw very long and 

 nearly straight ; inner secondaries lengthened and flowing. Our species 

 have a little tuft of lengthened black feathers over each ear and the tail 

 not forked. 



