262 



Diospilus oleraceus, Hal., destroys large numbers. The injury done by 

 C. rubsaameni is negligible and is far outweighed by its value as a 

 host of D. oleraceus, which is an important enemy of Meligethes aeneus 

 [R.A.E., A, ix, 549]. 



BoRNER (— ). Die Brutpflanzen der Kohlblattlaus. [The Food-plants 

 of Brevicoryne brassicae, L.] — Mitt. Biol. Reichsanst. Land- u. 

 Forstwirtsch., Berlin, no. 21, December 1921, pp. 194-195. 

 [Received 13th March 1922.] 



Brevicoryne brassicae, L. (cabbage aphis) occurs on and injures 

 a number of Cruciferae belonging to the genera Diplotaxis, Erucastrum, 

 Brassica, Sinapis, Eruca, Raphanus, Rapistruni, Myagrum and Crambe. 

 Lists of occasional food-plants, and of plants immune from infestation, 

 are given. 



BoRNER ( — ). Weitere Mitteilungen iiber Blattlauswanderungen. 



[Further Notes on Aphid Migrations.] — Mitt. Biol. Reichsanst. 

 Land- u. Forstivirtsch., Berlin, no. 21, December 1921, 

 pp. 195-200, 2 figs. [Received 13th March 1922.] 



Further notes on the migrations of Aphids in Germany are given 

 [R.A.E., A, ix, 137]. The migratory forms of Aphis viburnicola, 

 C.B., breed on Typhalatifolia. Sexual individuals of ^. nymphaeae, L., 

 were found in autumn on wild plum. The stem-mothers and their 

 offspring occur in spring on the shoots of apricot. This Aphid was not 

 noticed on plum or peach growing near apricot. Myzus similis, 

 V. d. G., produces winged sexual forms in autumn. Its transference 

 from Tussilago to Hippophae was successfully effected, and later 

 on its return migration was observed. Its migratory forms will not 

 feed on Cirsium spp., on which plant a non-migratory species, Myzus 

 carduinus, Wlk., occurs. Sexual forms of Brachycaudus cardui, L., 

 were successfully transferred to plum, and the resulting eggs gave rise 

 in spring to stem-mothers that had a numerous progeny of quite 

 typical Brachycaudus pruni, Koch. The migratory individuals of this 

 brood established themselves on various plants, including Carduus. 

 B. cardui is thus only a phase in the cycle of B. pruni. 



The author is inclined to treat as distinct species the various black 

 A.phids, Aphis papaveris, L. {euonymi, F.), A. viburni. Scop., and 

 A. rumicis, L., and further provisionally describes a new species, A. 

 philadelphi, which lives on Philadelphus, and is transferable to 

 Euonymus, Viburnum, and various weeds. He discusses his views 

 on this complicated problem in some detail. 



Speyer ( — ). Beitr'age zur Biologie der Kohlschotenmucke [Dasyneura 

 brassicae, Winn.). [Contributions to the Biology of the Pod 

 Midge, D. brassicae.] — Mitt. Biol. Reichsanst. Land- u. Forst- 

 wirtsch., Berlin, no. 21, pp. 208-217, 7 figs. [Received 13th 

 March 1922.] 



In 1919 and 1920 the Naumburg branch of the Imperial Biological 

 Institute received rape-pods infested with the larvae of a midge, 

 Perrisia {Dasyneura) brassicae, Winn., and of a weevil, Ceuthorrhynchus 

 assimilis, Payk. A premature yellowing, chiefly found at the places 

 where the midge larvae are sucking, is the chief sign of injury by 

 P. brassicae. The adults, which are destroyed in large numbers by 



