(iv) CONTENTS. 



Page 



NiPher — On a New Form of Lecture Galvanometer 287 



Engelmann, G. — Notes on Agave 291 , 370 



Riley — Notes on the Yucca Borer, Megathymus yuccce Walk. . • . 323, 566 

 Broadhead, G. C. — The Rocky Mountain Locust and the Season of 



1875 345 



Broadhead, G. C. — The Meteor of December 27, 1875 349 



CoNANT — Archaeology of Missouri 353 



Broadhead, G. C — Age of Our Porphyries 366 



Engelmann, G. — About the Oaks of the United States 372, 385, 539 



Seyffarth — Correction of the present Theory of the Moon's Motions, 



according to the Classic Eclipses 401 



Croswell — Mound Explorations in Southeastern Missouri 531 



Riley — On the Larval Characters and Habits of the Blister-beetles 

 belonging to the Genera Macrobasis Lee. and Epicauta Fabr. ; 



with Remarks on other Species of the Family Meloid.e 544 



Riley — On a remarkable new Genus in Meloid^e infesting Mason- 

 bee Cells in the United States 563 



Riley — Further Remarks on Pronnba yuccasella, and on the Pollina- 

 tion of Yucca 568 



Riley — On the Differences between Atitsopteryx fqinetaria Harr. 

 and Anisopteryx cBscularia W.-V., with Remarks on the Genus 



Paleacrita 573 



Riley — A new Gall on Acorn-cups 577 



Engelmann, G. — The Flowering of Agave Shaiuii 579 



Engelmann, G. — The American Junipei^s of the section Sabina 583 



Engelmann, G. — A Synopsis of the American Firs {Abies Link) ... 593 



Journal of Proceedings i-cclxxv 



Publications received in exchange. 

 " donated. 



General Index cclxxvii 



Errata — Corrections and Additions cclxxxv 



