NOTICES OF NEW BOOKS. 439 
teen species of Bombus are well described and figured ; these 
include the reinstatement as species of B. lucorum, B. ruderatus, 
and B. distinguendus, previously recognized as distinct by 
Smith, but not by some later authorities. Of the parasitic 
genus Psithyrus, which is not only inimical to, but also so super- 
ficially resembles Bombus, six species are enumerated. The 
coloured figures of the species comprised in these genera have 
reached the highest point in artistic realization and technical 
adequacy. The chapter devoted to the ‘‘ Domestication of the 
Humble-bee”’ is thoroughly practical, and the result of the 
writer’s personal experience. 
Under ‘‘ Anecdotes and Notes,’ Mr. Sladen has described 
some interesting observations, the result of a method which in 
ornithology is known as “‘ bird watching,’ and which in modern 
entomology has reached its highest development in the writings 
of Fabre, Wheeler, McCook, Forel, the Peckhams, and other 
patient and skilled observers. The book also contains some 
good advice on the subject of ‘‘ making a collection.”’ 
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