ENTOMOLOGICAL WORKS. 307 



are divided into five genera; viz. Eutroctes, Zabnis, Pelor, 

 Polysitus, and Acorius ; and though the author only describes 

 twenty-six species, the work extends to seventy-six pages. It 

 would have been more generally useful if he had written it 

 entirely in Latin, and had given the names of the authors on 

 the same subject, and the synonyms. His second essay will 

 be on the Amaroides. 



10. Versuch einer gencmen beschreibung der in Schlesien 

 einheimischen Arten der Familie der riiderwanzen Ploteres. 

 Latr. Von T. E. Schumrnel. Mit. 4. Kupfertafchi. Breslau, 

 1832. — An excellent monograph on the genera Hydrometra, 

 Velia, and Gerris, constituting the family Ploteres, Latr. ; 

 accompanied by numerous and accurate dissections and figures. 

 Several new species of Gerris are described, and their variations 

 are well exhibited in the last plate. The author gives complete 

 synonyms of the genera and species. 



11. Versuch einer genauen beschreibung der in Schlesien 

 einheimischen Arten der gattung Raphidia. Linn. Von 

 T. E. Schumrnel. Mit einer illuminirten Kupfertafeln. 

 Breslau, 1832. — An essay much on the same plan as the pre- 

 ceding. The author describes four species (two of them new), 

 the nervures of whose wings often vary in the same specimen. 

 The species described are : 1. Ophiopsis, Linn. 2. Crassi- 

 cornis, Hartlich. 3. Notcita, Fabr. 4. Xanthostigma, Schum. ; 

 the two latter are common near London. The plate represents 

 the wings, head, &c. of each species. 



12. Observationes de speciebus nonnullis generis Myceto- 

 phila vel novis, vel minus cognitis scripsit F. H. Stannius. 

 Med. et Chir. Dr. Accedit tabula cenea colorata. Vratislavia, 

 1831. — An interesting monograph on the genus Mijcetophila, 

 which the author appears to have thoroughly studied. This 

 group belongs to the Tipularice Fungicolce, in which he has 

 also included Leia, Sciophila, Sciara or Molobrus, and Cor- 

 dyla. He gives an account of their habits and economy, and 

 observes that their larvae are intimately allied to those of 

 Lepidoptera, while they differ from other Dipterous larvae, in 

 having the stigmata placed together on the side of each segment, 

 and in some other characters. He says that this formation 



