VOLUME FOUR 



NUMBER FOUR 



iflunial ai Entinunlmjii 



DECEMBER 1912 



JAN 1.61913 ' 



Contents 



WEINLAND. H. A. 

 ESSIG. E. O. 



ALEXANDER. CHARLES P 

 HILTON. W. A. 

 COLE. F. R. 

 BACON. GERTRUDE 



The Cosmopolitan Habits o( the Fruit Fly 



Host Index to Calltomla Plant Lice II 



The American S[>ecles of Adelphomyla Bertiroth 



A Preliminary Study of the Central Nervous System of Spiders 



Notes on the Dtptera of Laguns Beach 



Some CoUembola of Laguna Beach 



Shorter Articles and Important Literature of the Past Year 



GRINNELL. FORDYCE - ... News Notes 



TlUe Page and Index to Volumas 111 and IV 



PUBLISHED QUARTERLY BY THE 



Srpartmrnt nf iBtnlnriu nf Pnminta (Eollrqp 



CLAREMONT. CALIFORNIA. USA 



Knlercd at the Clamiioiil. Cal I'osl Dffic- l>cl 1. 1« 



iiirr Act of Coniirr^* of Mnr < lOO 



