194 
REVIEWS AND EXCHANGES. 
The Cambridge Natural History, vol. vi. Insects, part ii. By David Sharp, 
M.A., M.B., F.R.S. Macmillan & Co. Price 17s. net. 
Of all the ten projected volumes of this excellent series the present is the only 
one that cannot be called complete in itself. The class Insecta in general and the 
lower orders of the class were dealt with by Dr. Sharp in vol. vi., a work which 
may be said to have already taken rank as a classic, although only published 
in 1895. ihe general reader that must necessarily be a more interesting 
A, Winged female ; B, Worker of ant {Simarufo-nigra)\ C, Wasp; D, Spider, associated 
with the ant. 
Mktamohi'Hosis ok Monda rhabdofhora. — A, l.arva in case, natural size; B, larva magni- 
fied ; C, female pupa in case ; D, male ; E, female pupa magnified ; E, male imago ; G, female. 
volume than the present, which, beginning in the middle of the Ilymenoptera, 
is entirely occupied with the systematic description of the higher orders. 
Nevertheless, containing, as it does, the Aculeate Ilymenoptera, Coleoptcra, 
Lepidoptera, Diptera and llcmiptcra, all described on the usefully comprehensive 
scale adopted throughout the series, the volume will be :is indispensable to the 
real student of entomology as its predecessor. Nor is it by any means deficient 
in topics of the deepest import to the general biologist — topics which, though 
