546 The American Naturalist. [June, 
SIEBENROCK, F.—Ueber Wirbelassimilation bei den Saurien. Ann. des K. K. 
Naturhistorischen Hofmusems; Separat abdruck aus Band VII, Heft 4, 1892. From 
SNYDER, M. B.—Report of Special Correspondence See at the Feb. Meeting 
of the Pr Club of Do 1893. From the aut 
TOWNSEND, C. H. T.—Catalogue of the described South Keii Species of 
Calyptrate PET Extr. Ann N ew York Acad. Sciences, Vol. VII, 1892. 
—A Blood-su zy Gnat of the Family fc Extr. Psyche, Vol. VI, 
1892.——A Cone al Summary of the Known Larval Food- Habits of the Acalyptrate - 
Muscidae; a Deptutnary Grouping of the Described Species of Sapromyza of North 
America, with one new species; Notes on North American Tachinidae with descrip- 
tions of New Genera and Species; = a on New Mexico Insects. Extrs. 
Canadian Entomologist, 1892. From the a 
Watcort, C. D.—Notes on the Cam a one of Pennsylvania and Maryland, 
from the Susquehanna to the Potomac. Extr. Am. Journ. Science, Vol. XLIV, 1892. 
——Preliminary Notes on the Discovery of a ane. Fauna in Silurian (Ordovi- 
cian) Strata. Extr. Bull. Geol. Soc. Am., Vol. III, 1892. From the Society, 
Warp, L. F F.—-Address before the Section of Economic Science and Statistics, A. 
A. A. S., 1892. From the author. 
ILCOX, J.—On the Evolution of the Earth and the Heavenly Bodies. Read before 
the Delaware Inst. Sci., Dec., 1892. From the author 
WINCHELL, H. V.—The Mesabi Iron Range. Extr. Twentieth Annual Rep. Minn, 
Surv. 
