231 



Vayssiere (P.). Sur les Principaux Moyens de Destruction de la 

 Mouche de I'Olive. [On the Principal Ways of destroying the 

 OKve ¥W.]—Bull. Soc. Nat. Acdimat. France, Paris, Ixvi, no. 3, 

 March 1919, pp. 78-81. 



In France, where Dacus oleae causes an annual loss of two-thirds 

 of the olive crop, the fly has 2 or 3 generations in the year, according 

 to the temperature. The adults are on the wing in mid-July and 

 again in mid-August, and, if there is a third generation, towards the 

 end of September. Hibernation may take place either in the pupal 

 stage in the soil or in the olive sheds, or in the winged stage under 

 the old bark. Methods of artificial control have already been noticed 

 [see this Review, Ser. A, ii, pp. 289, 452 and 479], but as they do not 

 give permanently satisfactory results, more reliance is beginning to 

 be placed on control by natural enemies by the introduction of para- 

 sites [see this Revieiv, Ser. A, vi, p. 256]. In the opinion of the author, 

 both methods should be employed simultaneously until such natural 

 enemies are firmly established. 



KJRYGER (J. P.). The European Trichogramminae. — Entomohgiske 

 Meddelelser, Copenhagen, xii, no. 2, 1918, pp. 257-354. 



This paper emphasises the scantiness of the present knowledge 

 of the Trichogbamminae. The known European representatives of 

 the sub-family comprise 11 genera and 30 species, of which 8 genera 

 and 19 species occur in Denmark. As regards the parasitic habita 

 of these Chalcids, some of which are of considerable economic impor- 

 tance, it is probable that some species are confined to one particular 

 host, while others attack various hosts, e.g., Trichogramma evanescens 

 infests the eggs of Sialis, Stratiomyids, Aterix, Chrysops, Tabaniis 

 and perhaps Nonagria. Very little is known either on this point 

 or as to the number of parasites that may be found in a single host. 

 The author is of opinion that only one individual of Trichogramma 

 is bred from an egg of Sialis and that this is also the case with Ophio- 

 neurus signatus in the eggs of Rhynchites hetulae ; on the other hand 

 he has bred as many as 13 individuals from a single Lepidopterous 

 egg. It is believed that hibernation is passed in the egg of the host. 



Whilst it is considered that there is only a single European species 

 of the genus Trichogramma, viz. : T. evanescens, Westw., it is admitted 

 that ultimately two others, T. semhlidis, Auriv., and T. piniperda, 

 WolS, may be recognised. Keys are given to the genera and species 

 of this subfamily, and 12 new species, all from Denmark, are described. 



RoEPKE (W.). Thamnurgides myristicae, eine neue javanische Ip'de 

 (Col. ; Scolytoidea) aus Muskat-Ntissen. [Thamnurgides myristicae, 

 a new Javanese Scolytid infesting Nutmegs.]— Trew^ta, Batavia, 

 i, no. 1, January 1919, pp. 23-29, 7 figs. 



In newly gathered nutmegs a small Scolytid beetle, new to science, 

 has been occasionally foimd in great abundance in Java, and it has 

 also been reported as infesting the nearly mature nutmegs before 

 picking, though the author is unable to confirm this last point. It 

 is here described under the name of Thamnurgides myristicae. The 

 development of this pest takes place in the nutmegs lying on the ground, 



