306 
ZOOLOGICAL UTERATUllE. 
obtained from the examination of the types of Gravenhorst’s 
collection. 
VoLLENHovEN, S. C. Snellen VAN. Dc Inlandschc Bladwespen 
in hare Gedaantewisseling en Levenswijze beschreven. 
Twaalfde Stuk. Tijdschrift voor Entom. serie^ Deel i. 
pp. 189-208, pis. 7-9 ; 1866, 
A continuation of Vollenhoven^s descriptions of Dutch Ten- 
thredinidse, and of their natural history. 
Walker, Francis. Characters of a new genus and species of 
Chalcidites. Trans. Ent. Soc. Lond. 3rd ser. vol. ii. pp. 441- 
442: 1866. 
WuLLscHLEGEL, J. Ueber Vorkommen und Lebensweise der 
Halmwespe, Cephus pygmceus. Mittheil. schweiz. entom. 
Gesellsch. Band ii. pp, 153-158, with a note by Stierlin. 
C. Anatomical and Physiological papers. 
Kleine, G. Ueber das Gesetz der Entwicklung der Geschlech- 
ter bei den Insecten. Zeitschrift fur wiss. Zoologie, Band 
xxii. pp. 533-538. Beprinted from the Bienenzeitung, 
No. 11, 1867. 
This paper is in opposition to tlie views of Landois, and main- 
tains the parthenogenetic production of Drone-bees, and conse- 
quently the determination of the sex of the larvae of insects 
whilst still in the egg. 
Landois, H. Note sur la loi du developpement sexuel des In- 
sectes. Comptes Rendus, tome Ixiv. pp. 222-224. Trans- 
lated in Ann. & Mag. N. H. 3rd ser. vol. xix. p. 224. 
Relates to the development of the sexes in Bees. 
. Ueber das Gesetz der Entwicklung der Geschlechter 
bei den Insecten. Zeitschrift fiir wiss. Zoologie, Band 
xvii. pp. 375-379. 
An account of Landois^s observations on the development of 
the Honey-Bee, previously published in the Comptes Rendus, 
Landois maintains that the sex is not determined in the ovum, 
but during development, by difference in the quality or quantity 
of the food. 
SiEBOLD, C. T. VON. Zusatz zu Landois^ vorlaufiger Mittheilung. 
Zeitschrift fiir wiss. Zoologie, Band xvii. pp. 525-532. 
Translated in Ann. &Mag. N. H. 4th ser. vol. ii. pp. 205-212. 
In this paper Siebold discusses the theory of the production of 
sex in insects proposed by Landois, and maintains, chiefly from 
general considerations, that the sex is inherent in the egg when 
deposited by the female insect, and not dependent on the food of 
the larva. 
