541 



that the Dutch East Indian species is neither 0. depressum nor the 

 allied species, 0. acufangulum. It should be known provisionally as 

 Gonocephalum (Opotrum) sp. 



Mutyca grandis, a Bug preying on the Macrolepidopteron, Papilio 

 thoantiades, in Argentina. — La Prensa, Buenos Aires, 7th April 

 1919. (Abstract in Mthlij. Bull. Agric. Intell. & PI. Dis., Rome, x, 

 no. 7-8-9, Julv-August-September 1919, p. 1042. [Received 

 25th October 1920.] 



The caterpillars of Papilio thoantiades (orange worm) have been 

 observed in Buenos Aires to be preyed upon by a Pentatoniid bug, 

 Muti/ca grandis. It is believed that this bug attacks other Lepidoptera 

 injurious to agriculture, and a study of its life-history and habits is to 

 be made. 



Kryger (J. P.). Further Investigations upon the European Tricho- 

 gramminae. — Entomologiske Meddelelser, Copenhagen, xiii, no. 4, 

 1920, pp. 183-188. 



Further notes on the hosts of Trichogramma evanescens are given 

 [R.A.E., A, vii, 231]. 



The author had not seen Silvestri's paper on Centrobia [R.A.E., A, 

 vi, 504] when writing in 1918. He does not agree with Silvestri that 

 the species found by the latter on oak is Centrobia icalkeri, Forster, 

 considering it a new species for which he proposes the name G. silvestrii. 

 A key is given to the four European species of this genus, viz : — 

 C.fdrsteri, Kr}"ger, C. silvestrii, sp.n., C. silveMrii var. minor, SHv., 

 C. similis, Silv., and C. walkeri, Forst. These are briefly described. 



RosTRUP(S.). Jordloppeangrebet i 1918. Jordloppernes Levevis og 

 Forsog med deres Bekaempelse. [Flea-beetle Attack in 1918. 

 The Habits and Control of Flea-beetles.] — 142 Beretning Statens 

 Forsogsvirks. i. Plantekultur ; Tidsskr. Planteavl., Copenhagen, 

 xxvii, 1920, pp. 216-286, 11 figs. With an English Summary. 



Flea-beetles were particularly abundant in Denmark during the 

 summer of 1918 [R.A.E., A, \di, 541], the species concerned being 

 Psijlliodes chrysocephala on turnips and swedes grown for seed ; 

 Ghaetocnema concinna on beets ; and Phyllotreta nemorum, P. undulate(, 

 P. sinuata, P. atra, P. nigripes, and P. vittula on cruciferous crops. 



The severity of the attack is probably chiefly due to weather con- 

 ditions, a hot and dry summer being particularly favourable. Infesta- 

 tion was found to be most severe in areas that had been ploughed and 

 manured in the spring. 



The remedial agricultural measures advocated ha^'e abeady been 

 noticed [loe. cif.]. For garden and experimental plots, spraying with 

 tobacco extract diluted to a nicotine percentage of 0*1 (100^120 gals. 

 an acre) is advocated. The spray should be applied as soon as tlie 

 flea-beetles appear, and repeated in the event of new attacks. 



