HYMENOPTERA. 
289 
Westwood, J. O. Descriptions of new genera and species of 
Exotic Hyraenoptera. Trans. Ent. Soc. London, 1868, 
pp. 327-332 : December 1868. 
C. Anatomical and Physiological Papers. 
Bessels, Emil. Die Landois^scbe Theorie widerlegt durch das 
Experiment. Zeitsclir. fiir wiss. Zoologie, Band xviii. pp. 
124 141. 
In this memoir the author refutes, from actual experiments, the 
assertions of Landois with regard to the development of the sexes 
in Insects, and especially in the Bee (sec ' Record,^ 1867, p. 306) . 
Bessels confirms Siebold’s theory. 
Lucas, H. Quelques mots sur un cas de cyclopie observe chez 
un Insecte Hymenoptere de la tribu des Apiens [Apis mel- 
lifica ) . Annales Soc. Ent. France, 4^ serie, tome viii. pp. 
737-740, pi. 12. figs. 1-3. 
In this paper Lucas describes a 5 of Aj)is mellifica, in which 
the two eyes are confluent on the vertex and the ocelli wanting. 
The insect is imperfectly developed in other respects. 
Plateau, Felix. On the production of the Sexes in Bees. 
Ann. & Mag. Nat. Hist. 4th series, vol. ii. pp. 252-255. 
The author supports the view of Landois, in opposition to that 
maintained by Dzierzon, Yon Siebold, and others, and cites the 
occurrence of androgynous Bees in evidence that the larvae must 
be asexual up to a certain time. He refers to the analogy of the 
Aphides, assuming Balbianf s observations on the hermaphrodite 
nature of the viviparous forms to be correct, and suggests that, 
by some kind of food, the dormant male organs, which are sup- 
posed to exist in the larvae, are forced into development. He 
discusses the observations of Sanson and Bastian, and en- 
deavours to explain them in accordance with the above prin- 
ciples. 
Sanson, A. Sur les conditions determinantes des sexes chez 
les Abeillcs. Comptes Rendus, tome Ixvi. pp. 754-756. 
Notes on a case of production of Drones in worker-cells, cited 
in opposition to the views of Landois. 
General Observations. 
Oresson has commenced a list of a collection of Mexican Hymenoptera 
collected by F. Sumichrast and presented by him to the American Entomo- 
logical Society. The portion published relates exclusively to IchneumonidjE, 
of which many new species are described. (Trans, Amer. Ent. Soc. ii. pp. 1- 
88). Jc/m. hrevwc7itris (Cress.) conica (BrullO- 
Erauenfeld (Verb, zool.-bot. Ges. in Wien, xviii. p. 290) gives a list of 
the species of this order collected by him upon the Nicobars, with the omis- 
sion of the Ichneumonidse. The number of species recorded is 21, 10 of which 
are Formicidse. About half the species were new. 
