102 BULLETIN UNITED STATES GEOLOGICAL SUKVEY. [Tol.Y. 



Lakus atricilla, Linn. — Laugliing Gull. 



Is found in this region from April 8 until October 30, in large nuni- 



Ibers ; breeds here. 



The specimen measures as follows : 



No. 622, (?, 35.30x15.50; wing 11.50; tail 4.61; bill 1.27, at base 0.40, at gonys 0.34; 

 tarsus 1.76. 



Laeus frankxini, Eicb. — Franklin''s Eosy Gull. 



Arrives April 8, and remains until the lakes in this vincinity close, 

 which generally occurs by the end of October ; is common, but not quite 

 so abundant as the j)receding species. 



Sterna forsteri, IsTutt. — Forster^s Tern. 



Arrives April 20, and remains until October 1; very common and 

 breeds here. 



Sterna hirundo, Auct. — Common Tern. 



Is found here in large numbers from April 20 until about the 1st of 

 October ; breeds here. Is ever on the wing hovering over the lakes in 

 search of its food. 



The specimens measure as follows : 



No. 623, 9, 29.25x15.25; wing 10.75; tail 7.20; tarsus 0.97; bill 1.39, at base 0.43, 

 at gonys 0.43. 



No. 624, $ , 29.50 X 15.50 ; wing 10.75 ; tail 7.25 ; tarsus 0.93 ; biU 1.53, at base 0.42, 

 at gonys 0.42. 



Hydrochelidon lariformis, (L.) Ooues. — Black Tern. 



Is very common from April 20 until the beginning of October, about 

 which time it departs south. Breeds here. 



The specimen measures as follows : 



No. 636, ^,23.00x9.75; wing 8.50; tail 3.17; tars. 0.65; m. t. & claw 0.95; billL05. 



COLYMBID^. 



CoLYMBUS TORQIJATUS, Briinn. — Great Northern Loon. 



The Great ]S"orthern Loon or Diver passes north in the early spring. A 

 very few remain in this vicinity during the period the lakes are open, 

 but the great majority pass on, and, returning October 1, are then seen 

 in large numbers until October 30. 



PODICIPIDiE. 



JECHMOPHORUS occiDENTALis, (Lawr.) Coues. — Western Grebe. 



Is occasionally seen during the migrations, but not in any numbers. 

 I have secured but a single specimen of this Grebe, as its flight is gen- 

 erally at a considerable height. 



PoDiLYMBUS PODiCEPS, (L.) Lawr. — Pied-Mlled Grebe. 



Arrives about May 1, and remains untU October 27 5 is common in all 

 the smaller lakes, which it seems to prefer, and it breeds in the taU 



