137 



\'ayssiere (P.). La Lutte contre les Sauterelles en Crau. — Rev. 

 d'Hist. Nat. AppL, Paris. Kre Partie, no. 12, December 1920, 

 pp. 337-341. 



The Moroccan locust, Dociostauriis maroccanns, began to cause 

 apprehension hi the Crau district [department of Bouches-du-Rhone] 

 in 1917, and developed to such an extent that remedial measures were 

 organised early in 1920. Three months' work by a defence league 

 of the local agriculturists stopped any extension of the infestation 

 to localities where early vegetables are grown on a large scale. The 

 methods used were those previously tested [R.A.E., A, vii, 432]. 



Borne R ( — ). tJber das Auftreten geJIugelter Formen bei Blattlausen. 



[On the Occurrence of winged Forms of Aphids.j — Mitt. Biol. 

 Reichsanst. Land- n. Forstwirtsch., Berlin, no. 16, 10th and 11th 

 Yrly. Repts., 1914 and 1915, April 1916, pp. 42-43. 



The relation between the development of the food-plants and the 

 appearance of winged generations of Aphids is briefly discussed. 



BoRNER ( — ) & Blttnck ( — ). Beitrage zur Kenntnis der wandernden 

 Blattlause Deutschlands. [Contributions to the Knowledge of the 

 migratory Aphids of Germany.] — Mitt. Biol. Reichsanst . Land- u. 

 Forstwirtsch., Berlin, no. 16, 10th and 11th Yrlv. Repts., 1914 

 and 1915, April 1916, pp. 25-42. 



This paper on the migratory Aphids found in Germany contains 

 a specific hst of the aphididae and pemphigidae. In each 

 case the food-plant of the stem-mother and her progeny (the chief host) 

 and the food-plant of the parthenogenetic generations (the inter- 

 mediate host) are given. 



The relation of Myztis ribis, L., to M. galeopsidis, Kalt., is discussed. 

 In 1915, Van der Goot expressed the opinion that M. ribis is a migrator}^ 

 species, and suggested that M. galeopsidis was its parthenogenetic 

 form. The senior author has succeeded in obtaining several partheno- 

 genetic generations from the winged progeny of stem-mothers, after 

 such progeny had been transferred to Galeopsis, but the differences 

 distinguishing M. ribis from M. galeopsidis persisted in the partheno- 

 genetic forms from red currant and from Galeopsis. 



Borner (— ). Uber Blutlosende Safte im Blattlauskorper und ihr 

 Verhalten gegenuber Pflanzensaften. [On the haemolytic Fluids 

 in the Bodies of Aphids, and their Relation to Plant Juices.] — 

 Mitt. Biol. Reichsanst. Land- ii. Forstwirtsch., Berlin, no. 16, 

 10th and 11th Yrly. Repts., 1914 and 1915, April 1916, pp. 43-49. 



Experiments have revealed a haemolytic fluid in the body of Aphids. 

 Its presence has been traced in the saliva of the insects, and it appa- 

 rently exists in the body before the adults commence feeding. The 

 specific biological significance of this fluid has not yet been determined. 

 Some of it is apparently transferred to the food-plant in the act of 

 sucking, and may be responsible for discolouration and gall formation. 

 The haemolytic action of the fluid becomes neutralised after being 

 mixed with plant juices for some time. 



