INDEX TO VOL. XV. 
Accipiter Cooperii, 242. 
fuscus, 232. 
Actiturus Batramius, 241. 
Adgialitis montanus, 209. 
vociferus, 209, 240. 
A#giothus linaria, 236. 
Aischna clepsydra, 271. 
coustricta, 271, 376. 
eremita, 376. 
janata, 271. 
propinqua, 376. 
virens, 374. 
Agelezus phoeniceus, 202, 224, 239. 
Agrion aduncum, 3874. 4 
civile, 275. 
coecum, 374. 
Maria, 374. 
Ramburii, 276. 
Agrypnia, 385. 
AIKEN, C. E., and C. H. HOLDEN, JR. 
Notes on the birds of Wyoming and 
Colorado, 193. 
Aix sponsa, 210, 227, 241. 
ALLEN, J.A. On the geographical va- 
riation in birds and mammals, 156; 
geographical variation in birds, 212. 
Amazon, origin of the valley of, 153. 
Ampelis cedrorum, 198, 222, 235. 
garrulus, 198. 
Anas boschas, 210, 241. 
Anax Junius, 271. 
Anisopteryx pometaria, 381. 
vernata, 381. 
ANNUAL MEETING, 164. 
REPORTS, 164, 182. 
Anser frontalis, 262. 
hypaboreus, 241. 
Anthus ludovicianus, 196, 234. 
Antrostomus Nutalli, 206. 
vociferus, 225, 233. 
Apatania nigra, 296. 
Archibuteo sancti-johannis, 232. 
Architectonica tricarinata, 23. 
Architeuthis dux, 255. 
monachus, 255. 
Ardea herodias, 209, 227, 240. 
Ardetta exilis, 227. 
Axgia putrida, 275. 
Athene hypugea, 208. 
Athya americana, 210. 
vallisneria, 210. 
ATWOOD, N. E. On the distribution of 
the squid, 255. 
Beetis, 291. 5 
femorata, 291. 
leuconeura, 292. 
Beetisca, 376. 
Balenoptera musculus, 26. 
Bernicla canadensis, 241. 
Hutchinsi, 210. 
BICKNELL, EH. On a method of exhib- 
iting the formation of crystals, 311. 
Bittacus stigmaterus, 300. 
BOLL, JAMES. Exhibition of winter in- 
sects, 47. 
Bonasa umbellus, 227, 240. 
Bopyrus, 256. 
Boreus brumalis, 25, 155, 300. 
nivoriundus, 25, 155, 300. 
Botaurus lentiginosus, 209, 240. 
Brachiopoda, systematic position of, 315. 
BREWER, DR. T. M. On the appear- 
ance of Oporornis agilis in Mass., 3; 
on the remarkable abundance of Den- 
droica castanea in Wis. and Mass., 192. 
Bubo virginianus, 208, 226, 232. 
Bucephala albeola, 210. 
americana, 210. 
BURBANK, L. S. On some natural or- 
naments of the Mammoth Cave, 162. 
BURGESS, EDWARD. Elected Record- 
ing Secretary and Librarian, 47. 
Buteo borealis, 232. 
lineatus, 242. 
pennsylvanicus, 226, 242. 
Butorides virescens, 227, 240. 
Calamospiza bicolor, 201. 
Calopteryx zequatilis, 274. 
lateralis, 376. 
maculata, 273. 
Sayi, 376. 
Cardinalis virginianus, 224. 
Carpodacus Cassini, 199. 
frontalis, 199. 
purpureus, 242. 
Cat, origin of the domestic, 159. 
Cathartes aura, 227, 232. 
Catherpes mexicanus, 196. 
Celithemis eponina, 263. 
Centrocercus urophasianus, 209. 
Centurus carolinus, 226, 233. 
Cerithidea turrita, 24. 
Certhia americana, 236. 
Ceryle alecyon, 206, 225, 233. 
Chetura pelasgia, ‘295, 933, 
Charadrius virginicus, 240. 
Chaulelasmus streperus, 210. 
Chauliodes denticornis, 298. 
maculatus, 299. 
pectinicornis, 298. 
rastricornis, 298. 
serricornis, 299. 
(387) 
