Ifa TEENS. 



folded wing and its outer web is dusky, inner, white ; outer 

 web of outer primary, Fig. 63. 



black ; beneath, tinged 

 with pearly on abdomen 

 only; bill, red, black on 

 terminal half, plate 3 ; 

 feet, rather light red. In 

 winter the crown is more 

 or less white but the oc- 

 ciput is always b 1 a c k M 

 Young, Jine along fore- 

 arm, dusky; rump and 

 upper tail coverts, gray; 

 tail shorter, tips of feath- F, C, d, 2. 1-10. 



ers, not much narrowed, fig. 63; bill, black, yellow at base 

 of lower mandible; pure white beneath. Downy young; 

 buff above of varying shades marbled with dusky; white be- 

 neath ; throat, more 

 ^ or less dusky. Cry, 

 "Te arr" with the 

 last syllable pro- 



C, d, 3. longed; alarm note, 



"AY" repeated rapidly many times. Greater part of northern 

 hemisphere and Africa; in N. A. breeds along the coast and 

 in suitable places in the interior, but east of the Plains, from 

 Fla., Texas, and Arizona to the Arctic regions in May and 

 June; comes north in early May; goes south in Sep., but a 

 few linger as far north as Mass, until the middle of Oct. ; 

 winters south of the U. S. Abundant. 



3. FOSTER'S TERN, S. FOSTEEI. Differs from 2 in hav- 

 ing the bill black, yellow at tip only.; with the outer web 

 of the outer primary, hoary; outer web of outer tail feather, 

 white. In winter the whole of the black cap is overwashed 

 with whitish thus including the occiput, but there is a patch 

 of black on either side of head surrounding eye and extend- 

 ing over ear coverts, fig. 65 ; this mark also characterizes the 



