^54 
Analyses of Books. 
[October, 
Histoire des Col£opteres de France. Par le Dr. Seriziat. 
Precedee d’une Introduction a l’etude de l’entomologie, par 
M. Ch. Naudin. Ouvrage adopte par le Conseil de l’Um- 
versite. Paris : Firmin-Didot et Cie. 
To understand why, even within the limits of one and the same 
great zoological region, certain species stop short at boundaries 
not apparently marked with any great distinctness by a change 
of climate and productions, we require, in the first place, local 
faunas drawn out with precision. We seek to be enabled to 
trace upon the map the exaCt range, if not of every species, 
still of the representative forms of each group. Every step 
taken in this direction reveals to us relations previously unsus- 
peaed. We all know that within an epoch which geologically 
speaking is but as yesterday, England and France formed one 
country, conneaed together by land, where now roll the waters 
of the Channel. We know that in climate the southern counties 
of England differ little from the northern and north-western de- 
partments of its continental neighbour. Yet when we compare 
the inseas of the two countries — and we selea them for compa- 
rison as being less modified by human intervention than the 
mammals, birds, or reptiles— we perceive at once a most remark- 
able difference. Species entirely wanting in England make their 
appearance across the Channel ; others, rare in this country, be- 
come at once common; and yet others, present in both countries, 
tn spIrCI different stations. It is especially to be noted 
figured witn smauw an™. r , . i 
Melolontha vulgaris. Calosoma sycophanta , very rare and littoral 
