VOLUME FOUR 



NUMBER FOUR 





DECEMBER 1912 





Content£i 



1 WEINLAND. H. A. - - - - - The Cosmopolitan Habits of the Fruit Fly 



2 ESSIG. E. O. - - - - - ■ Host Index to California Plant Lice II 



3 ALEXANDER. CHARLES P. - - The American Species of Adelphomyia Bergroth 



4 HILTON. W. A. - - A Preliminary Study of the Central Nervous System of Spiders 



5 COLE. F. R. ------ Notes on the Diptera of Laguna Beach 



6 BACON. GERTRUDE - - - - • Some Collembola of Laguna Beach 



7 ------ - Shorter Articles and Important Literature of the Past Year 



8 GRINNELL. FORDYCE - - - . - - - News Notes 



Title Page and Index to Volumes III and IV 



PUBLISHED QUARTERLY BY THE 



ip:partm?nt of Itologii at fomnna (EollFiaP 



CLAREMONT. CALIFORNIA, U. S. A. 



Entered at the Claremont, Cal., Post Offictf Oct. I. 19l(i, as second-class mailer, under Act of Congress of Mar 3. IS?' 



