INDEX TO VOL. XXI. 
The names of genera and species described as new are italicised. 
Abbott, Dr. C. C. Discoveries of paleo- 
lithic implements in the Delaware 
Valley , 124. 
Acanthaceae, 431. 
Agilaeus phoeniceus, 400. 
Agrotis jaculifera, 155. 
Aix sponsa, 404. 
Amygdaloidal cavities and fillings, 91. 
Anas boschas, 404. 
Annual Meeting, 1880, 1; 1881, 175. 
Annual Reports, 1, 175. 
Anthus ludovicianus, 398. 
Aorta, the, in Lepidoptera, 153. 
Apanteles limenitidis, 28. 
Archibuteo ferrugineus, 402. 
Ardea herodias, 403. 
Arnold Arboretum, vote concerning the, 
298. 
Ascidians, development of, 441. 
Bartramia longicauda, 404. 
Batrachia, 105, 169 ; 309. 
Batrachia, tadpoles of, 105, 309. 
Bernicla canadensis, 404. 
Birds, claws and spurs on wings of, 301. 
of Dakota, 397. 
Bouve, Thomas T. Resolution and re- 
marks on his retirement from the 
Presidency, 16. 
Bowditch, Dr. H. P., on the papillae of 
the hands and feet, 194. 
Braintree argillite, relation of, 274. 
Bubo virginianus, 401. 
Buccinum diversum, 307. 
Bufo americanus, 308. 
fowleri, 308. 
Burbank, L. S., death of, 49. 
Burgess, Edward. Secretary’s Report, 
10 ; note on the aorta of lepidopter- 
ous insects, 153; structure of the 
mouth in the larva of Dytiscus, 223 ; 
Secretary’s report, 186. 
Buprestis punctulata, 471. 
Butterflies, ichneumon pai-asites of, 18. 
By-laws, amended, 161. 
Campoplex, 20. 
pieridicola , 20. 
Carboniferous insects, 167, 391. 
Carr, Luoien. Paleolithic implements 
at Trenton, N. J., 145. 
Cathartes aura, 402. 
Centrocercus urophasianus, 403. 
Centrophanes ornatus, 398. 
Cervle alcyon, 401. 
Chaetura pelagica, 401. 
Clothilla, with ocelli, 471. 
Chologaster Agassizii, 82. 
Chondestes grammaca, 399. 
Chordeiles popetue henryi, 401. 
Circus hudsonius, 402. 
Coahuila, Mex., archaeological collections 
from, 118; wounded skull from, 300. 
Colaptes auratus, 401. 
Mexicanus, 401. 
Colias philodice, 154. 
Constitution, amendment of, 161. 
Contopus borealis, 401. 
Corvus corax carnivorus, 400. 
frugivorus, 400. 
Cotile riparia, 398. 
Crosby, W. 0. Geology of Frenchman’s 
Bay, 109; classification of the tex- 
tures and structures of rocks, 279. 
Cross fertilization of plants, 410. 
Cumberland iron ore, structure of, 194. 
Custodian’s Reports, 1, 175. 
Cvstacanthus paniculatus, 433. 
turgidus, 431. 
Dakota, Birds of, 397. 
Danais archippus, 153. 
Davis, James, death and bequest of, 222. 
Davis, Wm. M. Geology of Mt. Desert, 
Me., 117 ; classification of lake basins, 
315. 
Dawson, J. W. Note on Spirorbis from 
an ironstone nodule from Mazon Cr., 
111., 157. 
Delaware Valley, paleolithic implements, 
124; age of the gravels of, 137. 
Diatomaceae, gift of Mr. F. Habirshaw’s 
collection of, 451. 
Diller, J. S. On the felsites and asso- 
ciated rocks in vicinity of Boston, 168. 
Diosma ericoides, 422. 
Dodge, W. W. Notes on the geology of 
Eastern Massachusetts, 197. 
Dytiscus, structure of mouth in the larva 
of, 223. 
Emerson, Ex-President, George B., 
death of, 159. 
Empidonax minimus, 401. 
Entedon, 36. 
antiop ae, 36. 
Eremophila alpestris leucolaema, 400. 
Erica Wilmorei ?, 424. 
Ericaceae, 424. 
