102 THE CANADIAN ENTOMOLOGIST. 



lustre, the femora pale beneath to near the tip. Wings rather broad, the 

 outstanding scales of the veins linear and narrowly ovate, denser on the 

 forks of the second and fourth veins. Claws simple in the female. 

 Length about 2.5 mm. 



In the male the palpi are slightly longer than the proboscis, the apical 

 portion hairy, bronzy-black throughout. Wings narrower than in the 

 female, without the longest and narrowest scales ; the coloration similar. 



One male and one female, Las Cascadas, Canal Zone, Panama. 

 (A. Busck, collector.) 



Type No. 12 194, U. S National Museum. 



A new mosquito has also come to hand from Banff, Alberta, for 

 which we propose the name : 



AeJes Sansoni, n. sp. — Closely allied to Aedes subcantans, Felt, but 

 larger and darker in colour, the scales of the wings entirely black, not 

 intermixed brown and whitish on the costa, as they are in A. subcantans. 



Five specimens, Banff, Alberta, Canada. Collected in the summer 

 of 1908. (N. B. Sanson.) 



Type No. 12 195, U. S. National Museum. 



BOOK NOTICES. 



Darwinism To-day. By Professor Vernon L. Kellogg. Pp. XII. + 

 403. New York : Henry Holt & Co. 



The fifty years which have elapsed since the publication of Darwin's 

 " Origin of Species," have witnessed the ardent prosecution of biological 

 research in many directions. A vast number of new facts have been col- 

 lected, correlated and their interpretation attempted. In the light of this 

 new knowledge the various aspects of the theory of evolution by natural 

 selection have been critically examined, in a manner much more search- 

 ing than was thought possible to Darwin's contemporaries. Yet at the 

 present time we still have the greatest diversity of opinion. On the one 

 hand are scientific critics, of no mean influence, maintaining that natural 

 selection is now discredited as the only, or even the chief, agent in the 

 organization of species, and at the other extreme are those who are still 

 •firm believers in its efficiency. 



The literature of the subject is largely controversial, widely scattered, 

 and much of 'it in German, and in presenting the gist of it in a 

 form which enables the biological student or the general reader to 

 form a sound estimate of the present status of Darwinism, Prof. Kel- 

 logg has performed a very valuable piece of work. 



