INDEX TO VOL. XX. 
The names of genera and species described as new are italicised. 
Abeillia typica, 349. 
Abyla pentagona, structure of, 318. 
Acestrura heliodori, 345. 
mulsanti, 345. 
Adelomyia melanogenys, 349. 
Aegiothus canescens, 270. 
Aglaeactis, cupripennis, 349. 
Agyrtria brevirostris, 350. 
candida, 350. 
leucogaster, 350. 
milleri, 350. 
nitidicauda, 350. 
tephrocephala, 350. 
tobaci, 350. 
Aithurus polytmus, 343. 
Amazilia beryllina, 351. 
cerviniventris, 351. 
cinnamonea, 351. 
cyanifrons, 352. 
edwardi, 351. 
erythronota, 352. 
feliciae, 352. 
fuscicaudata, 351. 
mariae, 351. 
pristina, 351. 
sophiae, 352. - 
Amboccelia, sp., 31. 
Amphigenia elongata, 34. 
Amygdaloidal melaphyre of Brighton, 
Mass., 416. 
Amygdaloids, 129, 416, 427. 
Amygdules, banded, 426. 
Anachus cornutus, 146. 
Anniversary, fiftieth, of the Society’s 
foundation, 498. 
ANNUAL REporRTS, 1, 9, 244, 257. 
Anser hyperboreus, 274. 
Anthomyia canalicularis, 116. 
Anthrenus megatoma, 57. 
pimpinellae, 57. 
scrophulariz, 57. 
thoracicus, 58. 
varius, 58. 
Anthrenus scrophulariae, 121 2838. 
Anthus ludovicianus, 265. 
Apolemia uvaria, 323. 
Aphantochroa cirrochloris, 338. 
Aphilanthops, 401, 506. 
Astata, species of, 386. 
Atthis heloisae 344. 
Augastes lumachellus, 348. 
superbus, 348. 
Avocettinus eurypterus, 347. 
Avocettula recurvirostris, 347. 
Bartlett, N. H. Danalite from, 284; 
iron ore of, 288. 
Basilinna leucotis, 352. 
Bellona cristata, 348. 
exilis, 348. 
BENTON, Dr. E. R. The amygdaloidal 
melaphyre of Brighton, Mass., 416. 
Boston, amygdaloids near, 416, 427. 
compression in rocks of the 
Boston basin, 308. 
felsites north of, 355. 
glacial drift in vicinity of, 
220. 
Bourcieria columbiana, 342. 
fulgididula, 342. 
prunelli, 342. 
torquata, 342. 
wilsoni, 342. 
Bouvek, President T. T. Remarks on 
Dr. J. B. 8. Jackson, 124; resigna- 
tion as President, 497. 
Brachiopoda, Devonian of Brazil, 14. 
Brazil, Brachiopoda of, 14. 
coral reefs of, 39. 
crystalline formations of, 480. 
BREWER, Dr. T. M, Additional notes 
on New England Birds, and 
five new species of, 263; List of 
Humming birds in the Society’s 
collection, 335; death of, 411. 
Brighton amygdaloids, 427. 
rocks of, 129, melaphyre of, 
416. 
Brooks, Dr. W. K. Development of 
digestive tract in Molluscs, 325. 
