444 



mentioned which warrant the hope that hot-air treatment may prove 

 effective against this Nematode in these bulbs. Tulip bulbs infested 

 with Aphis tuliqxte, Boy., were treated by fumigation for half an 

 hour with carbon bisulphide at the rate of 500 c.c. per cubic metre 

 of space. Liothrips setinodis, Renter, infested the bulbs of LUium 

 IMrdalinum as in the preceding year ; two hours' treatment with 

 a 2 per cent, solution of naphthaline soap killed all individuals. 

 Sprinkling the bulbs with naphthaline also gave good results. 



Willows were attacked by beetles, especially Phyllodecta vulga- 

 tissima. In former years spraying with Paris green or lead arsenate 

 gave very irregular results, and investigation has shown these to be 

 due to the actual leaf-surface being protected from the insecticide 

 by the hairs found on the under-side of the foliage of many species 

 of willow. Spra3^ing with these poisons is however useful in the case 

 of M^illows with smooth leaves. Infestation on other wUlows may be 

 checked by very early spring spraying of the twigs and young leaves, 

 on which the beetles that have hibernated feed prior to ovipositing. 

 Collection of these beetles may also be resorted to. The infestation 

 with Diprion {Lophyms) sp. of Pinus cembra that had been sprayed 

 with carbolineum in winter showed that the cocoons of this sawfly 

 are impenetrable to this insecticide ; the larvae may be combated 

 by spraying with Paris green during the summer. 



The Chalcid parasite, Monodontomenis dentijoes, Boh., was bred 

 from cocoons of Diprion (Lophyrus) pini. The Ichneumonid, Hemiteles 

 hicolorinus, was liberated m a forage store infested by meal moths 

 and it is estimated that the pests were reduced by 80 per cent, in 

 consequence. Larvae of the rose sawfly, Emphytus cinctiis, that were 

 hibernating in rose stems, were foimd to be parasitised by Monoblastus 

 neustriae, Rtz., Hemiteles castaneus, Tasch., Microcryjotus erythrinus, 

 Grv., and Cratocryptus {Cuhoceplialus) oviventris, Grv. Contarinia 

 (Diplosis) pyrivora was found to be parasitised by Inostemma piricola. 

 Among the parasites bred in the laboratory were Litvs nigriceps, sp. n., 

 from a Homopteron ; Aspidiotiphagus scJioeversi, sp. n., from the 

 scale, Chionaspis aspidistrae ; and Chiloneurus vanpoetereni, Smits 

 van Burgst, and a species of Encyrtus or Eucomys, from Shissetia 

 {Lecanium) hemisphaerica, 



A brief report by Smits van Burgst is appended regarding work 

 at the entomological laboratory of the Institute of Phytopathology 

 at Ginneken, which has a very rich collection of Ichneumonidae. 



Theobald (F. V.) Insects on the Sea Buckthorn. — The Entomologist, 

 London, Hi, no. 675, August 1919, pp. 169-171, 1 fig. 



In searching for Rhopalosiphum hip)p)op)haes, Koch, on sea buckthorn 

 (Hippophae rhamnoides) countless nymphs of Psylla hippophaes, 

 Forst., were found in company with it. The brown-tail moth, Nygmia 

 phaeorrhoea {Eujwoctis chrysorrhoea) was also found in very large 

 munbers, and had completely defohated one patch of this plant. 

 Larvae have been collected to ascertain the presence of any parasites. 

 The Tachinid fly, Thelymorpha vertiginosa, Fin., is the only parasite 

 of this moth so far recorded. Other insects collected included the 

 gold-tail moth, Arctornis chrysorrhoea {Porthesia similis). 



