THE GENERAL SUBJECT. 
221 
RoNDANi, Camillo. Degli Insetti nocivi e dei loro Parassiti. 
Bull. Ent. Ital. v. pp. 3-30, 133-165,206-232. 
Completes the Lepidoptera, and in like manner discusses injurious 
Cohoptera and Hymenoptera and their various insect enemies. 
Saundees, H. [See Bethune.] 
Weyenbeegh, H. Ueber ein zweikopfes monstrum (Larve von 
Chironomus) und iiber Insecten-monstra iiberliaupt. 
S. E. Z. xxxiv. pp. 452-458, fig. 
After describing and figuring the double-headed larva above-men- 
tioned, the author discusses various works on Insect monstrosities, coming 
to the conclusion that only one, a larva of Bomhyx mori, can be considered 
a genuine monster, the others being mere deformities. 
General observations on Insect instinct. Das Ausland, xliii. (1870) pp. 
217 & 219. 
Insect-music. Landois' observations (Nat. Ver. preuss. Rheinl. & 
Westph.) reproduced with comments ; op. cit. pp. 429 & 430. 
On the position of the centre of gravity in insects : a short statement 
of his theory by F. Plateau, Nature, v. (1872), p. 297. An abstract of 
the same author's observations on submersion, &c., of aquatic Articulata 
(Zool. Rec. ix. p. 226) is given by him in Ann. N. H. (4) xi. pp. 70-73. 
A general account of the mouth-organs of insects by B. T. Lowne, 
J. Quek. Club, iii. pp. 207-209. 
Observations by P. Panceri on the luminosity of the eyes of insects 
are discussed in Bull. Ent. Ital. pp. 57 & 58. 
Hypermetamorphosis : general observations by J. Lichtenstein, Bull. 
Soc. Ent. Fr. (5) iii. p. xxi. 
Mimicry : Salticus and Sima (p. ix.), Pentatoma (p. xiv.) ; P. E. Soc. 
1873. 
On Insects useful to man^ cf. Goureau, Bull. Soc. Yonne, xxvi. p. 3. 
M. Girard's 'Etudes sur les insectes carnassiers utiles,' Paris: 1873, 
8vo, cut (extr. from Bull. Soc. Acclim.), and the same author's 
'Rapport sur I'Exposition des Insectes de 1872 a Paris' (extr. from 
publications of Soc. des Agriculteurs de France), have not been seen by 
the Recorder. 
Noxious and useful Insects. A paper by Lethierry, Despretz, & 
others, entitled " Reponses a un questionnaire de la Societe des Agri- 
culteurs de France, sur les Insectes nuisibles ou utiles," extr. from the 
Archives du Comice agricole de Lille, is referred to in Bull. Ent. Fr. (5) 
iii. p. X. 
In S. B. z.-b. Wien. xxiii. p. 9, is an abstract of a 'Bericht' of the 
Krakauer Landwirthschaf ts-gesellschaf t, containing short notices of insects 
of all orders injurious to plants. A similar list in Bull. Soc. L.N. Fr. 
1873, p. 151. 
On destruction of insects injurious to vegetation, cf. Yol, C. R. Ixxvi. 
