1S71.] 385 [Maynard, 



Not common spring and fall (Verrill). 



156. Pelionetta perspicillata Kaup. Surf Duck. 

 Rare spring and fall (Verrill). 



157. Mergus Americanus Cass. Sheldrake. 



Common spring and fall (Verrill). I have seen it on Lake Umba- 

 gog, in November. 



158. Mergus Serrator Linn. Red-breasted Merganser. 

 Not common spring and fall. 



159. Lophodytes cueullatus Reich. Hooded Merganser. 

 Breeds not uncommonly on Lake Umbagog in hollow stubs, ac- 

 cording to J. G. Rich. Mr. Deane has the eggs taken there. 



LARID^J. 



160. Larus argentatus Brunn. Herring Gull. 



Breeds on some rocks in B Pond every season about June 5th, 

 (Deane). 



161. ChrcBoocephalus Philadelphia Leach. Bonaparte's 

 Gull. 



Not common spring and fall (Verrill). 



COLYMBIDJS. 



162. Colymbus torquatus Brunn. Loon. Common about 

 the lakes and ponds. Breeds at Umbagog about June 15th. 



PODICIPID^. 



163. Podiceps eornutus Lath. Horned Grebe. 

 Rare spring and fall (Verrill). 



164. Podilymbus podiceps Lawr. Water Witch. Com- 

 mon spring and fall (Verrill). 



Prof. Agassiz made some observations on a set of bould- 

 ers in Berkshire County, Mass. 



These boulders are found in place only upon a ridge in 

 Canaan, from which some have been carried by glacial action 

 and deposited in parallel lines through Richmond and Lenox, 

 crossing two ranges of hills in their course. These boulders 

 could not have been distributed in this regular manner by 



PROCEEDINGS B. 8. N. H.— VOL. XTV. 25 JUNE, 1872. 



