248 SPECIES DES COLEOPTERES. 



presented in the engraving. The parts connecting the two fragments are 

 missing. 



Fig. 3 is a small tooth, showing the prominent transverse ridge which marks 

 the roots on their outer side. 



Fig. 4. The inner side of a larger tooth of the form which appears to cha- 

 racterise the species. 



Fig. 5, a, apparently a portion of skin without studs ; e and b, studs of the 

 natural size. (From the under surface of the mass fig. 1). 



Fig. 6, b, a stud magnified. 



Figs. 7 & 8. Two views of the supposed frontal curved spine. 



Fig. 9. One of the two Ichthyodorulites, or spines supporting the dorsal 

 fins found with the jaws. 



REVIEWS. 



Art. I. — Species General des ColSopte'res. Tome 6ieme. Paris, 1839. 

 Par Ch. Aube. 



The Baron Dejean, to whom we are indebted for the first 

 five volumes of this work, comprising the Cicindelidce and 

 Carabidae of his magnificent collection, having found it im- 

 possible, from his numerous political and military avocations, 

 to continue it with regularity, has confided the descriptions 

 of the water-beetles, composing the families Dyticida and 

 Gyrinid<e, to Dr. Charles Aube ; and it is impossible to have 

 placed the subject in better hands. Already well known by 

 his monograph on the Pselaphida as a microscopical coleop- 

 terist, this gentleman has added greatly to his fame by this 

 elaborate volume of upwards of 800 pages, in which nearly 

 as many species of aquatic Coleoptera are carefully described. 

 He has not, judiciously as we think, confined himself to the 

 collection of Dejean, but being in correspondence with the 

 chief European entomologists, he has been enabled to produce 

 a volume, superior, in our opinion, not only as to the extent 

 of its materials, but also in the style of its execution, to any 

 of the previous volumes of the work. There are several new 

 genera established ; and amongst the species we find those 

 described by Mr. Babington in the ' Transactions of the En- 

 tomological Society' adopted and referred to, but under names 

 previously given to them by other writers. 



Art. II. — Zeitschrift fur die Entomologie ; Herausgegeben von Ernst 

 Friedrich Germar. Erster Band Erster Heft. 8vo. 196 pp. 2 plates. 

 Leipzig, 1839. 



Having just received from the author a copy of this work, we 

 hasten to announce its appearance, being convinced that the 



