171 



Priesner (H.). Ein neuer Liothrips (Uzel) [Ord. Thysanoptera] aus 

 den Niederlanden. [A New Liothrips from Holland.]— Zoo/. 

 Meded. R. Mus. Nat. Hist., Leiden, v, no. 4, 31st December 

 1920, pp. 211-212. [Received 30th January 1922.] 



Liothrips vaneecki, sp. n.,is described from the bnib scales of Lilium 

 pardalinuvi. 



KoTiL.\ (J. E.). Hopperburn of Potato and its Control.— ()/r/)'. Bull. 

 Michigan Agric. Expt. Sta., East Lansing, iii, no. 4, May 1921, 

 pp. 128-131, 3 figs. [Received 30th January 1922.] 



The seasonal history of the potato leaf-hopper, Empoasca mali, 

 as occurring in Michigan, and the method of controlling its ravages 

 by means of Bordeaux mixture are briefly described [cf. R.A.E., A, 

 ix, 31]. At least four applications of the spray are advocated. 



Fowler (G. J.). The Lac In^visivy.— Appendix 12th Ann. Kept. 

 Council Lnd. Inst. Sci., Bangalore, 1921, pp. 8-12. [Received 

 30th January 1922.] 



A study is being made of the conditions of life of the lac insect, 

 with the object of determining what is its actual food, and what are 

 the chemical transformations involved in converting such substances 

 into lac. It is hoped by this means to find a scientific basis for the 

 control of the activity of the insect, by discovering from their chemical 

 composition which trees are suitable as food-plants and at what period 

 of their growth they are likely to give the best results. A thorough 

 knowledge of the metabolism of the lac insect may render it possible 

 to feed it artificially and so produce lac by bio-chemical methods, 

 but under controlled conditions. Lac is known to grow well on Shorea 

 talura, and it has also been found growing at Bangalore on Ficus 

 henjaminiana. There are apparently two, and possibly three, genera- 

 tions of the insect in a year. 



Two new species of lac insect have been discovered during the year ; 

 one, found on Michelia champaka in Mysore, had also been observed 

 on mango trees in the Philippines and described as Tachardia niinuta, 

 Morr. ; the other, found on Acacia sundara, is allied to both T. minuta 

 and T. decorella. Mask. 



Two forms of bacteria have been discovered that are apparently 

 characteristic of unhealthy lac, while a yeast-like organism seems to 

 occur only on healthy growth ; further investigations on these are in 

 progress. Insect enemies of the lac insect are the larva of a lace- wing 

 fly, Chrysopa sp., and the caterpillar of Eublemma sp. The chemical 

 examination of lac-bearing twigs is briefly discussed. 



Howard (L. 0.). Report [1920 21] o£ the Entomologist— ^.S. Dept. 

 Agric, Washington, D.C., 1st August 1921, 33 pp, [Received 

 24th January 1922.] 



During the year the apparent increase of the area infested by the 

 European corn borer [Pyrausta nubilalis] may be said to have been 

 comparatively insignificant in United States territory. The most 

 important development was the discovery in August 1920 of a large 

 infestation in Southern Ontario. The western edge of this Canadian 

 infestation reaches within 30 miles of Michigan, and thus offers a 

 great menace to the maize-belt States. Large quantities of the 



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