CONTENTS 



PAGES 



1. Birds in Relation to a Grasshopper Outbreak in California, by 



Harold C. Bryant 1-30 



2. On the Structure and Relationships of Dinosphaera paliistris 



(Lemm.), by Charles A. Kofoid and Josephine R. Michener ...21-28 



3. A Study of Epithelioma Contagiosum of the Common Fowl, by 



Clifford D. Sweet ■....29-51 



4. The Control of Pigment Formation in Amphibian Larvae, by 



Myrtle E. Johnson, with pi. 1 53-88 



5. Sagitta californica, n. sp., from the San Diego Region, including 



Remarks on its Variation and Distribution, by Ellis L. Michael, 

 with pi. 2 89-126 



6. Pyenogonida from the Coast of California, with Description of 



Two New Species, by H. V. M. Hall, with pis. 3-4 127-142 



7. Observations on Isolated Living Pigment Cells from the Larvae 



of Amphibians, by S. J. Holmes, with pis. 5-6 143-154 



8. Behavior of Ectodermic Epithelium of Tadpoles when Cultivated 



in Plasma, by S. J. Holmes, with pis. 7-S 155-172 



9. On Some Californian behizopoda, by H. J. Hansen 173-180 



10. Fourth Taxonomic Report on the Copepoda of the San Diego 



Region, by Calvin 0. Esterly, with pis. 10-12 181-196 



11. The Behavior of Leeches with Especial Reference to its Modifi- 



ability. A. The General Reactions of the Leeches Dina Micro- 

 stoma Moore and GlossipJionia stagnalis Linnaeus; B. Modifia- 

 bility in the Behavior of the Leech Dina microstoma Moore, by 

 Wilson Gee, with 13 text figures 197-305 



12. The Structure of the Ocelli of Poly orchis peniciUata, by Etta V. 



Little, with pis. 13-15 307-328 



13. Modifications and Adaptations to Functions in the Feathers of 



Circus Imdsonius, by Asa C. Chandler, vrith pis. 16-20 329-376 



14. A Determination of the Economic Status of the Western Meadow- 



lark (Sturnella negUcta) in California, by Harold C. Bryant, 

 with pis. 21-24, and 5 text figures 377-510 



15. Parasynaptic Stages in the Testis of Aneides lugubris (Hallowell), 



bv Harry J. Snook and J. A. i^ong, with yla. 25-26, and 1 text 



figure 5U-52S 



Index 529-538 



„ , .538 



Errata 



