IMPERIAL BUREAU OF ENTOMOLOGY. 



REVIEW 



OF 



APPLIED ENTOMOLOGY. 



Series A. 

 Vol. IX.] [192L 



MoLz (E.). Weitere Beitrage zur Kenntnis der Gartenhaarmiicke 



{Bibio hortnlaniis, L.). [Further Contributions to the Knowledge 

 of B. hortidanus.] — Zeitschr. angew. Entom., Berlin, vii, no. 1, 

 September 1920, pp. 92-96, 3 figs. 



It is only of recent years that the economic importance of Bibio 

 hortidanus, L., has been recognised. An attempt is here made to 

 complete to some extent the observations previously made by the 

 present author and Pietsch when sugar-beet, barley and oats were 

 recorded as attacked [R.A.E., A, ii, 377]. 



In September 1918 potatoes in a field near Halle were found damaged 

 beneath their skins, and the larvae of B. hortulanus were found to be 

 the cause. In uprooted potatoes only a few larvae were found and then 

 only in concealed portions, thus confirming the view that dry con- 

 ditions are unfavourable to them [loc. cit.]. Most of the larvae had 

 apparently left the uprooted potatoes and gone underground. They 

 were seen in numbers on roots when the latter were being dug. Only 

 those parts of the field that had received stable manure were infested. 

 In November the field was ploughed up, manured, and sown with 

 winter wheat. Soon afterwards the presence of the larvae was noticed 

 along the drills, and it was found that they were feeding on the seed. 

 Laboratory experiments showed that when the seeds begin to swell 

 they are attacked at the point of germination. Potatoes are preferred 

 to the wheat grains, but experiment showed that infestation occurs 

 only in potatoes that have suffered some previous injury. 



Potato-skins steeped in a 1 per cent, solution of arsenious acid are 

 an attractive and effective poison-bait. 



Nagel (W.). Beitrag zur Biologie der Kleidermotte {Tineoki biselliella) 

 und ihrer Bekampfung mittels Cyanwasserstoffs. | A Contribution 

 to the Biology of Tineola biselliella and its Control by Means of 

 Hydrocyanic Acid Gas.] — Zeitschr. angew. Entom., Berlin, vii, 

 no. 1, September 1920, pp. 164-171. 



The eggs of Tineola biselliella, Humm., are laid in sheltered situations, 

 preferably near food, without being attached to their support. One 

 female lays from 50 to 90 eggs. Oviposition begins a day after mating 



(7467— A) Wt.P1850/163 1/21 1500 D.St. (Gp. 75) B 



