268 



vicinity of the experiment station during the following season, and 

 neither flies nor their eggs could be found. Despite careful watch, 

 none have been seen or reported since that year. During the season 

 of 1920 there were localities in Houghton County where the potato 

 beetle was very scarce, and others in which they were quite abundant, 

 thus resembling the condition in Alger County in 1900. In the 

 Dodgeville district the beetle was very numerous, and practically all 

 the beetles, as well as the full-grown larvae, found were covered with 

 from one to five or more eggs of the parasite. PIvidence of the existence 

 of this parasite gradually disappeared in all directions from this point, 

 until, in potato fields five miles away, eggs were only found on less than 

 one per cent, of the beetles or larvae. 



These observations indicate that D. doryphorae is at work in large 

 numbers in restricted areas only, though it covers an extensive 

 territory. They also indicate that the fly either migrates from year 

 to year to other localities, or else has other hosts upon which it develops 

 from tims to time. That the flies cannot increase to any extent is 

 due to the poisoning of the potato beetles, a practice that has become 

 quite general, for the poisoned beetles dry up rapidly, leaving the 

 young maggots of the Dipteron without food. 



DE Stefani (T.). Importanza dell' Entomologia applicata nell' 



Economia sociale. [The Importance of Applied Entomology in 

 Social Economv.j — Allevamenti, Palermo, ii, nos. 1-3, January- 

 March 1921, pp. 7-10, 35-37, 70-72. 



These are the first three parts of a paper aiming at making known 

 the economic importance of applied entomology. A number ot 

 successful solutions of problems, such as the introduction of Noviiis 

 cardinalis against Icerya purchasi, are enumerated and discussed. 



S. Bekampfung der tierischen Schadlinge unserer Obstbaume. 



[Measures against the Animal Enemies of our Fruit-trees.] 

 Schweiz. Zeitschr. Obst. u. Weinbau, Fraiienfeld, xxx, no. 6, 

 24th March 1921, pp. 85-86. 



Attention is drawn to legislation existing since 1867 in the Swiss 

 Canton of St. Gall against various fruit-tree pests, and to an ordinance 

 passed in 1870 with regard to outbreaks of cockchafers [Melolontha 

 meloloniha]. 



Antonelli (G.). Calendario Forestale Italiano 1921. [The Italian 

 Forestrv Calendar for 1921.] — Rome. Federazione pro Montibus, 

 1921,320 pp. Price Lire 7.50. 



This volume contains a mass of information valuable to foresters. 

 A section b\^ Prof. G. Trinchieri mentions the common insect and 

 fungous pests and the usual measures adopted against them. 



Bernard (C), Deuss (J. J. B.) & others. Bibliografisch Overzicht 

 iii. [Bibliographical Review iii.] — Medei. Proefst. Thee, Biiiien- 

 zorg, Ixxii, 1920, 116 pp. [Received 30th March 1921.] 



About 75 papers relating to tea culti\-ation are briefly abstracted. 

 Those of entomological interest have already been noticed in this 

 Review. The period covered extends roughly from 1913 to 1918. 

 The first of these reviews was issued in 1908 and the second in 1912. 



