[Established in 1S74.] 

 EDITED BY 



B: PiCKMAN Mann, Washington. D. C. ; G : Dimmock, Cambridge^ Mass.; 

 Albert J: Cook, Lansings Mich.; Stephen Alfred Forbes, Normal., 

 III. ; Joseph Albert Lintner, Albany^ N. T. ; Francis Hunting- 

 ton Snow, Lawrence, /iunsas ; W : Tkei.ease, A/atlison, Wise. 



Vol. 4. Nos. 129-131. 



[The numeros for October-December 1SS4 are Nos. 126-12S.] 



January-March 1SS5. 



COIVTENTS: 



Advertisements . 238 



The Insects of Betula in North America — Anna Katherina Dhnmock . 239-243 



Systematic Position of the Genus Apiocera — Daniel William Coqnillctt . 243-244 

 The Geological History of Mvriopods and Arachnids — Samuel Hubbard 



Scudder 245-250 



The Double Role of the Sting of the Honey-bee ..... 251-252 



Permanent Mounting of Tracheae of Insects — F. T. Hazleiuood . ■ ■ 253 

 Proceedings of Societies — Zoological Society of London — Linnean Society 



of London 253-254 



Bibliographical Record, no. 3675-37S7 . . 255-264 



Entomological Items 265-268 



Published by the 



CAMBRIDGE ENTOMOLOGICAL CLUB, 



Cambridge, Mass., U. S. A. 



YEARLY SUBSCRIPTIONS, $2. VOLUME, $5. MONTHLY NUMEROS, 20 c. 



fEntered as second class mail matter.] 



