< : o N T E N T S. 



For Announcements, Reports, etc., see General Index. 



PAGE 



Alexander, Charles P. New or little-known crane-flies 



from the United States and Canada: Tipulidse, Ptychop- 



teridae, Dipt era. Part 3 (Plates XXV-XXXI) 480 



Banks, Nathan. Revision of Cayuga Lake spiders (Plates 



X, XI) 68 



Barringer, Daniel M. A possible partial explanation of the 



visibility and brilliancy of comets. With an addendum 



by Elihu Thomson. 472 



Berry, S. Stillman. Cephalopoda of the Kermadec Islands 



(Plates VI, VII, VIII, IX) 45 



Cockerell, T. D. A. Some bees from Australia, Tasmania, 



and the New Hebrides 360 



Colton, Harold, S. On some varieties of Thais lapillus in 



the Mount Desert region, a study of individual ecology 440 



Crawley, Howard. The sexual evolution of Sarcocystis muris 



(Plates I, II, III, IV) 3 



The zoological position of Sarcosporidia 379 



Dall, William H. A new species of Onchidiopsis from 



Bering Sea 370 



Daniels, L. E. See Henderson, Junius. 



Fowler, Henry W. Cold-blooded vertebrates from Costa 



Rica and the Canal Zone 389 



Notes on fishes of the orders Haplomi and Mycrocyprini 415 



Heath, Harold. The nervous system of Crepidula adunca 



and its developments ... 479 



Hebard, Morgan. See Rehn, James A. G. 



Henderson, Junius, and L. E. Daniels. Hunting Mollusca 



in Utah and Idaho (Plates XV, XVI, XVII, XVIII) 315 



Jacobs, Merkel H., Ph.D. Temperature and the activities 



of animals 85 



