138 



Schwartz (— ) cS: Bauxacke ( — ). Das Auftreten der Maikafer im 

 Jahre 1919. [The Occurrence of Cockchafers m 1919.]— .17/7/. 

 Biol. Reichsanst. Land- u. Forshcirtsch., Berlin, no. 18, 15tli 

 Vrly. Kept., 1919, October 1920, pp. 82-87, 1 map. 



Tlie occurrence of Melolontha in various parts of Germany 

 during 1919, and its periodicity in each locality is discussed. The 

 life-cycle apparently varies in certain districts from three to four years. 

 Attention is drawn to the importance of keeping systematic records 

 of the occurrence of these beetles in e\-er3- locality with a view to 

 organising general remedial measures. 



BoRXER ( — ) & Bluxck (— ). Zur Lebensgeschichte des Rapsglanz- 



kafers. [On the Life-history of Mcligd/ics aencits.]—Mi/l. Biol. 

 Reichsanst. Land- it. Forstwirtsch., Berlin, no. 18, 15th Yrlv. 

 Kept., 1919, October 1920, pp. 91-109, 1 fig. 



The life-history of Meligethes aeneiis, F., as studied in the neighbour- 

 hood of Naumburg, is described [c/. R.A.E., A, viii, 542; ix, 64]. 

 Under laboratory conditions the duration of the different stages was 

 chiefly influenced by temperature. The feeding habits of the larvae 

 and adult beetles are described, and their role as pollen-carriers is 

 discussed. 



The most important natural enemies of M. aeneus are the Braconids 

 Diospiliis oleraceits, Isitrgiis morionellus, L heterocerus, and another 

 undetermined species of this genus. 



BoRXER (— ) & Bluxck (— ). Beitrag zur Kenntnis der Kolil- und 



Rapserdflohe. [Contribution to the Kntnxiedge of Phyllotrcta 

 spp. and Psylliodes spp.]. — Mitt. Biol. Reichsanst. Land- u. 

 Forstwirtsch., Berlin, no. 18, 15th Yrly. Rept., 1919, October 

 1920, pp. 109-119, 9 figs. 



The general biology of Phvllotreta spp., and Psylliodes spp., as studied 

 in the vicinity of Naumburg during 1919, is discussed, and the injury 

 caused by these flea-beetles to various crops is described. Experi- 

 ments in remedial measures are still in progress, the results of which 

 \\i\\ be published later. 



BoRXER ( — ). Wanderungen der Johannisbeer- und Kirschenblatt- 



lause. [Migrations of Red Currant and Cherry A]ihids.j — Mitt. 

 Biol. Reichsanst. Land- «. Forstivirtsch., Berlin, no. 18, 15th 

 Yrly. Rept., 1919, October 1920, pp. 119-120, 1 fig. 



In the author's previous paper [see above] Myziis ribis, L., and 

 M. galeopsidis, Kalt., are recorded as distinct species. Subsequent 

 observations have confirmed this view, which is apparently in 

 opposition to that held by Haviland [R. A.E., A, vii, 371]. M. ribis 

 may be considered as the Aphid of red currant and M. galeopsidis that 

 of black currant, although both species ma}' occur on several varieties 

 of currants. Rhopalosiphitm affine, sp. n., is described from red 

 currant. The summer food-plants of Myzoides cerasi, F., include 

 Galium spp. 



