xvi The Biological Society of Washington. 



March 3, 1906 — 413th Meeting. 



The President in the chair and 32 persons present. 

 The following communications were presented : 

 L. 0. Howard: The Gypsy Moth and the Brown -tailed Moth 

 and the Introduction of their European Parasites.* 



A. S. Hitchcock: A Synopsis of the Genus TripsaciimA 



March 17, 1906 — 414th Meeting. 



The President in the chair and 31 persons present. 



The following communications were presented. 



J. W. Gidley : Evidence Bearing on Tooth-cusp Development, 

 Based on a Study of Mesozoic IMammals.t 



M. C. Marsh: Hemoglobin Estimates and Blood Counts in 

 Fishes in Health and Disease. § 



Austin H. Clark: A Case of Melanism in West Indian Honey 

 Creepers. 1 1 



March 31, 1906 — 4i5fh Meeting. 



Vice-President Palmer in the chair and 29 persons present. 

 The following communications were presented : 

 Ch. Wardell Stiles: A Plan to Ensure the Establishment of 

 Type Species of Genera. H 



Rodney H. True : The Cultivation of Tea in the United States. 



April 14, 1906 — 416th Meeting. 



Vice-President Palmer in the chair and 75 persons present. 



The following communication was presented: 



D. T. MacDougal : The Delta and Desert of the Rio Colorado.** 



* Yearbook, Dept. Agric, 1905. 



t Bot. Gaz. 41, 294, April, 1906. 



X Proc. Wash. Acad. Sci., VIII, 91, 1906. 



§ Wash. Med. Ann., I, 397, 1902. 



II West Indian Black Forms of the Genus Cuereba. Auk XXIII, 392, Oct., 1906. 



H Science N. S., XXIIl, No. 592, 700, May 4, 1906. 



** Bull. Amer. Geog. Soc, Jan., 1906. Contr. N. Y. Bot. Gard., No. 77. 



