516 AUTHENTIC HISTOEY 



233. Pelionetta perspicillata, {Linn.,) Kaup., Surf Duck. Migratory; spring and 



autumn. Sp'm. No. 106, Mus. Linn. Soc. Lane. 



234. Oideniia americana, Swainson, American Scoter. Migratory; in autumn 



during stormy weatlier, this species sometimes arrive in large numbers on the 

 Susquehanna, and seem to pass on with the storm. 



235. Erismatura rubida, {WiU..,) Bon., Ruddy Duck. Migratory; spring and autumn; 



some seasons qviite abundant for a few days. Sp'm. No. 107, Mus. Linn. Soc. L. 



236. Mergus americanus, Cassin, Fisher Duck; Goosander. Resident; breeds in the 



county. Sp'm. No. 108, Mus. Linn. Soc. Lane. 



237. M. serrator, Linn., Red-breasted Fislier. Smaller than the preceding; resident; 



breeds in the county. 



238. Lophodytes cueullatu.s, (Linn.,) Eeich., Hooded Fisher. Frequent; breeds on the 



Susquehanna. Sp'm. No. 110, Mus. Linn. Soc. Lane. 



Family Laeid^ — The Gulls. 



Known No. of species in N. A., 46; in the county, 7. 

 2.39. Larus argentatus, BruenicJi, Herring Gull. Spring and autumn; not unfrequeut . 

 Sp'm. No. Ill, Mus. Linn. Soc. L. 



240. L. delawarensis, Ord, Ring-billed Gull. Occasional visitant, spring. Sp'm. No. 



112, Mus. Linn. Soc. L. 



241. Chroicoceplialus atricilla, (Linn.,) Later., Laughing Gvdl. Common in the 



spring. 



242. C. Philadelphia, (Ord.,) Later., Bonaparte's Gull. Common, spring and autumn. 



Sp'm. No. 113. Mus. Linn. Soc. L. 



243. Sterna caspia, Pallas, Caspian Tern. Two specimens shot on the Susquehanna at 



Marietta, September 21st, 1847; now in my collection. 



244. S. frenata, Qamb., Least Tern. Spring and autumn. Sp'm No. 114, Mus. Linn. 



Soc. L. 



245. Hydrochelidon plumbea, (Wils.,) Lawr., The Short-tailed Tern. Late summer; 



specimen in my collection. 



Family Colymbid^. 



Known No. of species in N. A., 12; in the county, 5 



246. Colymbus torquatus, BrunicTi, Loon. Frequent; spring and autumn. Sp'm No. 



— Mus. Linn. Soc L. 



247. Podiceps griseigena, (Bodd.,) Gray. Red-necked Grebe. Rare; one specimen in 



my collection. For reference to this individual I quote from my note book; 

 "shot on the Susquehanna, March 25th, 1847; male; length 18 inches; stomach 

 charged with sand, grass and feathers; lower intestines infested with a species 

 of TaincB.'''' 



248. P. cornutus, (Ornl ,) Lath., Horned Grebe. 



249. P. cristatus, Linn.,) Lath., Crested Grebe. Very rare. Sp'm No. 118, Mus. 



Linn. Soc. L. 



250. P. podilymbus, (Linn.,) Later., Pie-billed Grebe. Abundant. 



SUMMARY. 



Nvunber of Orders represented in N. A., 6; in the county, 6. 

 Number of Families represented in N. A., 56; in the county, 38. 

 Whole number of Species in N. A., 738; in the county, 250. 



