ON THE STRIDULATION OF INSECTS. 357 



10. Prodromus Hymenopterologice Scandinamccs auctore Dr. 

 Gustaf Dalilbom. \2mo. Lund. 1836. — Of .this elaborate 

 work, as yet, the first fasciculus only has come to England ; 

 which extends to the genera {Cimbex, including Trichio- 

 soma, Abia, Zarwa and Amasis,) Athalia, H>/lotoma, Syphona 

 {Sch'izocera), Lophyrus, Cladius, and part of Priophorus. We 

 hope Dr. Dahlbom will continue it, and we much wish all his 

 works could be readily procured ; we have tried every means 

 possible to obtain them, but without avail, much valuable 

 information, and very many new species, are thereby kept 

 from our knowledge. 



1 1 . Geschichte Systematik und Literatur der Insecktenkunde 

 ton den dltesten Zeiten bis auf die Gegenwart. {History, 

 System, and Literature of Entomology, from the earliest periods 

 to the present time, by Dr. John Nep. Eiselt. Svo. Leipzig, 

 1836.) — This is promising much for a volume of 255 pages, the 

 first 120 of which contain a very superficial and compendious 

 history of the science, and the remaining 135 pages are occu- 

 pied with a list of books, arranged systematically. That this 

 list cannot be complete, is self-evident, from the small space it 

 occupies ; but it is, nevertheless, very useful, from its classifi- 

 cation, and enumerates very many writers not contained in 

 Percheron's slovenly and inaccurate BibliograpMe Entomo- 

 logique. Entomological literature still awaits a work ably and 

 comprehensively executed. 



Art. XXXIX. — An Essay on the Stridulation of Lisects. 

 By M. GouREAu. 



(Extracted from the Annales de la Societe Entomologique de France.) 

 ( Concluded from p. 102. J 



Locusts {Acridium, Latr.) 



The locusts at first sight appear to resemble grasshoppers in 

 the general form of their bodies, and in their power of leaping, 

 but their musical organ is very different ; it is also situated in 

 the elytra, but unless observed whilst the insect is singing, 

 it is difficult to find. In some instances, indeed, it even 



