54 



is impossible, the ground will be thoroughly cleared of infestation 

 in a few days. Water being scarce in the Molinella district, experiments 

 were made with lime water, from 3| to 4 cwt. of lime being used per 

 acre. The best result was obtained by flooding the field with a stream 

 of water which had passed through a cutting containing the newly 

 slaked lime. Not only were the Tipulid larvae forced to escape with 

 all possible speed, but earthworms were killed in large numbers. 

 Tabanid and other Dipterous larvae also perish, while ants, Lasius 

 Jlavus, rapidly abandon their nests. Besides these effects the presence 

 of lime (at least in the locality where the trials were made) was a 

 distinctly beneficial addition to the composition of the soil, which was 

 extremely rich in organic matter. A simple cultural control consists 

 in growing rice during two consecutive years ; this will free the 

 ground of Tipulids. If forage requirements render this course im- 

 practicable, the lucerne or clover fields should be submerged when 

 they are to be ploughed up, i.e., from October to December. If sowing 

 is delayed, the crop will be protected to a very great extent. 



Del Guercio (G.). Generi e specie nuove di Afldidi o nuovi per la 

 Fauna italiana, [New genera and species of Aphididae or new 

 to the Italian fauna]. — Redia, Firenze, ix, (1913), pt. 2, pp. 168- 

 196, 1 pi. [Eeceived 12th November 1914]. 



The following aphids are recorded : — Trinacriella magnifica, gen. 

 et sp. nov., from Sicily, on oats both wild and cultivated ; an as yet 

 unnamed form found on the roots of rice at Molinella (Bologna) ; a 

 winged form of Pemphigus on beech from Brescia ; Syphoryne arte- 

 misiae, del Guercio, on Artemisia campestris (field wormwood) ; 

 Cladobivs farinosus, from Liguria, on a common species of Lamium 

 (dead nettle) ; Chaitophorus montemartinii on Lamium purpureum ; 

 Stenaphis monticelli, gen. et sp. nov., attacking reeds and canes {Phrag- 

 miles communis and Arundo donax), which greatly resembles Aphis 

 arundinis ; Aphis viciae, Kalt ; Macrosiphiniella fasciata, gen. 

 et sp. n., on Artemisia campestris; and Macrosiphon cyparissiae var. 

 cucurbitae, on a number of cultivated and ornamental plants and also 

 on Pyrus mains. 



Del Guercio (G.). Specie nuove di Afidini per le Graminacee in 

 Italia a confronto con quelle conosciute. [Species of Aphidinae 

 attacking Graminaceae, new to Italy and compared with known 

 species.] 72e(Zta, Firenze, ix, (1913), pt. 2, 31st March 1914, 

 pp. 197-212, 1 pi. [Received 12th November 1914]. 



These are given as Aphis avenae, Kalt.; A. maidis, Fitch; A. 

 maidi-radicis, Forb. ; A. hordei, sp. nov., on Hordevm murimnn; 

 A. vulpiae, sp. nov., on Vidjna; and Myzocallis saccharinus, sp. nov., 

 on a species of Sagina. 



Del Guercio (G.). Intorno ad alcuni Omotteri cecidogeni dell' Argen- 

 tina. [On certain gall-making Homoptera from the Argentine.] 

 Redia, Firenze, (1913), ix, pt. 2. 31st March 1914, pp. 151-167, 

 2 pla. [Received 12th November 1914.] 



The following new species collected by Prof. I. S. Tavares are de- 

 scribed : — Pemphigus canadensis found on Populus canadensis and 



