INSECTA - ORTHOPTEUA. 165 



family, although with only slight acquaintance with, what has been written on 

 the subject ; the newly instituted species consequently, will in part have to 

 be abolished, and the rather, because Pictet's excellent monograph has ap- 

 peared in the meantime. The newly proposed genus, Leptomeres, with 

 elongated penultimate, and slender terminal joint of the maxillary palpus, 

 coincides probably with Isopteryx, Pictet, or even CAloroperla, Newm., or 

 with both. 



PSOCIDES. Huber (Mem. de la Soc. de Phys. et d'Hist. Nat, de Geneve, 

 x, i, p. 35) has communicated his interesting observations upon several 

 species of Psocus. 



The author observed that they lay their eggs upon leaves, and surround 

 them with a web ; and that the various species form webs of different kinds. 

 JHiis fact is not new, although, perhaps the discovery of the spinning organ 

 which is placed, in the form of a couple of oblong corpuscles, on the 

 border of the labrum is.* A species with spotted wings, constantly remains 

 beneath filaments, which it spins from one side of the leaf to the other. 

 The author remarked that the Psocifeed. upon "rust" (Uredo), which chiefly 

 follows the punctures made \>y Aphides. 



LLBELLULIN.E. Rarnbur (Hist. Nat. des Ins. Neuropt.) has enriched this 

 family not only with a great number of new species, but also of new genera. 

 With reference to the species, it is remarkable that the author is en- 

 tirely unacquainted with Charpentier's great work on the European Libel- 

 lulce ; in general the new species, which are for the most part extra-European, 

 will still require to be subjected to special examination. 



The new genera are, in the Libellalicfae-gron]} : Nannophya, with one new 

 species, locality unknown ; Acisoma, with two new species, from the East 

 Indies and Madagascar; Zyxomma, with one new species, from the East 

 Indies ; Uracis, with one new species, from Buenos Ayres ; Polt/mura (the 

 same is no longer disposable), with Libell. sophroma, and fulcia, Drury ; 

 Palpoplcura, with Lib. dimidiata, L. ; portia, Dr.; niarginata, E.; lucia, Dr.; 

 fasciata, L. ; Diastatops, with Lib. p/tllata, obscura, Burin. ; Macromia, with 

 several new species. The author separates from the JEschnides, as a distinct 

 group, the Gomphides, with the eyes mostly placed apart ; and includes 

 under it these genera: Gomphus, Leach (L. forcipata, L.) ; Diastatomma, 

 Charp. (^2?. clavata, F.) ; Ictimis, new genus, with three new species ; Lin- 

 denia, Phenes, new genus, with one new species, from Cliili ; Corduleffaster, 

 Leach; Petalura, Leach (gigantea, Leach). The jEschnides are limited to 

 Anax, jEschna, Gh/nacantha, new genus, with exotic species. 



* I remember to have remarked also, in llydrophilus pifr,/*, a pair of 

 minute oblong corpuscles on the under side of the labrum, and since the 

 Hydrophili also spin, tliis may probably, in like manner, be the spinning 



organ. 



