66 



until the following year. Sometimes two or three parasitic larvae 

 are found in one egg. The degree of parasitism is small ; in 1917-1918 

 perhaps less than 1 per cent, were alrected. 



SiLVESTRi (F.). II Genere Thysanus, Walker (Hymenoptera : 

 Chalcididae.) [The Genus Thysanus, Wlk.] — BoU. Lab. Zool. 

 Gen. Agrar. R. ScuolaSup. Agric, Portici, xii, pp. 266-271. 2 figs. 



This is a re-description of the Chalcid genus Thysanus, Wlk.. and 

 of the genotype, T. afer, Wlk., which has been bred in Italy from 

 the scale, Aspidiotus ostreaejormis, Curt., occurring on Primus and 

 Corylus avellana., and from Aspidiotus or Asterolecanium (both scales 

 were found on the twigs) on Quercus robur. 



El Coledptero Saperda carcharias, L., parasitado. [The Beetle, 

 S. carcharias, attacked by a Parasite.] — BoL Soc. Enfom. Espana, 

 Saragassa, \, no. 7, October 1918, p. 150. 



The fungus, Entomophthora grylli, is recorded as infesting Saperda 

 carcharias, L. Larvae of this beetle, obtained from a block of Populus 

 nigra from the province of Gerona, Spain, were found to harbour 

 the fungus. A female adult was bred, but died in 12 days as a result 

 of the infestation. 



Berlese (A.). Istruzioni per combattere la Mosea delle Olive {Daais 

 oleae, Rossi). [Instructions for combating the Olive Fly, Dacus 

 oleae.] — R. Staz. Entom. Agrar., Florence, 1915, 11 pp., 8 figs. 

 [Received 2nd December 1918.] 



This paper describes both the author's and Professor Lotrionte's 

 methods of checking Dacus oleae by means of an arsenical poison- 

 bait [see this Review, Ser. A, ii, pp. 289 and 452]. 



De Stefani (T.). Alterazioni cecidiche piu frequenti su alcuni Albert 

 da Frutta in Sicilia. [The most common Galls on some Fruit 

 Trees in Sicily.]— .4 wwa/i R. Staz. Speriment. Agrum. Fruttic.^ 

 Acireale, iv, 1916-1917, pp. 147-170, 1 plate. [Received 2nd 

 December 1918.] 



The galls recorded in this paper are divided into groups, according 

 to the insects giving rise to them, and into sections, according 

 to the parts of the plant which are affected. Galls due to the action 

 of fungi are not included. 



Jack (R. W.). A Note on the Maize Stalk Borer. — Rhodesia Agric. Jl., 

 Salisbury, xv, no. 5, October 1918, pp. 449-450. 



The practice of burning maize stalks during the winter in order to 

 destroy the grubs of the maize-stalk borer [Busseoh fusca] has the 

 disadvantage of wasting a certain amount of humus that would 

 otherwise be returned to the soil. In view of the fact that many 

 farmers are anxious to follow some procedure by which they may 

 retain the manurial value of the stalks in the rapidly deteriora ing 

 soils of some parts of the country, and at the same time prevent the 

 emergence of the moths, a series of experiments was conducted at 



