CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY OF THK MUSEUM OF COMPARATIVE ZOOLOGY AT 



HARVARD COLLEGE. NO. 235. 



THE REACTIONS OF ARTHROPODS TO MONOCHRO- 

 MATIC LIGHTS OF EQUAL INTENSITIES 



* 



ALFRED O. GROSS 



FORTY-FIVE FIGURES 



CONTENTS 



1 . Introduction 468 



2. Historical 469 



3. Methods 475 



4. Observations 476 



A. Calliphora erythrocephala Meigen (larva) ^76 



1. Material 476 



2. Methods 477 



3. Results _ 477 



B. Calliphora erythrocephala Meigen (adult) 486 



1. Material 486 



2. Methods 487 



3. Results 487 



C. Drosophila ampelophila Loew (adult) 490 



1. Material 490 



2. Methods 491 



3. Results 491 



D. Zeuzera pyrina Linne (larva) 495 



1. Material 495 



2. Methods 496 



3. Results 496 



E. Feltia subgothica Haworth (adult) 500 



1. Material 500 



2. Methods 500 



3. Results 501 



F. Periplaneta americana Linne (adult) 501 



1. Material : 502 



2. Methods 502 



3. Results 503 



5. Discussion .■* 506 



6. Summary 511 



Bibliography 512 



467 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 14, NO. 4 

 MAY, 1913 



