345 



Mercet (R. G.). Nota sobre la Icerya purchasi en Espaiia (Hem. 



Coccidos). — Bol. R. Soc. Espanola Hist. Nat., Madrid, xxii, 

 no. 1-2, January-February 1922, pp. 136-141, 4 figs. 



Icerya purchasi (fluted scale) has recently been discovered in Spain 

 for the first time on Citrus, and it is probable that it occurs in many 

 parts of the Provinces along the Portuguese frontier. A general 

 account of this pest is given and of the value of natural enemies and 

 in particular of the Coccinellid, Novitis cardinalis, in reducing its 

 numbers. 



Ahlberg (O.). Thysanoptera from Juan Fernandez and Easter 

 Island. — IS! at. Hist. Juan Fernandez and Easter Island, Uppsala, 

 iii, pt. 2, 1922, pp. 271-276, 2 figs. 



The insects collected by the Swedish Pacific Expedition, 1916-17, 

 included five species of Thysanoptera, of which Sericothrips ineptus 

 and Physothrips skottsbergi from Masatierra are new. 



Spierenburg (D.). Een onbekende Ziekte in de lepen. [An unknown 

 Disease of Elms.] — Verslagen en Meded. Plantenziektenk. Dienst, 

 Wageningen, no. 24, February 1922, pp. 1-31, 4 plates. [Received 

 1st May 1922.] 



The information given here is substantially the same as that in a 

 paper already noticed \R.A.E., A, ix, 386]. 



Groot (C). Chloroclystis rectangulata, L., een voor Ooftboomen 

 schadelijk Rupsje. [C. rectangulata, a Caterpillar injurious to 

 Fruit-trees.] — Verslagen en Meded. Plantenziektenk. Dienst, 

 Wageningen, no. 24, February 1922, pp. 32-37. [Received 

 1st May 1922.] 



In recent years some Dutch fruit-growers have thought banding 

 to be ineffective against the winter moth, Cheimatohia hnmiata, owing 

 to the presence of large green caterpillars on banded trees. These 

 larvae, however, are those of Chloroclystis {Eupithecia) rectangulata, L. 

 Existing data on the life-history of this moth being of a conflicting 

 nature, the author kept adults in captivity. The eggs laid by them 

 in the summer did not hatch until the following spring, the first 

 larva being noticed on 18th March. If flower-buds are available, 

 the newly hatched larvae bore into them. One individual can destroy 

 several buds in succession. When the flower-bud is about to open, 

 the larva seeks to hinder this b}' binding it with a web. Owing to 

 the later development of the apple more of its blossoms are destroyed 

 than in the case of the pear. Injured blossoms soon fall. In the 

 case of the pear the young leaves are also attacked because the larvae 

 are not full-grown by the time that blossoming is over ; such injury 

 is rare on the apple. Where flower-buds are not available the larvae 

 feed on and skeletonise the unfolding leaves. Pupation occurs on the 

 trunks and probably in the ground also. It begins in mid-May 

 and lasts about 25 days. The adults remain, by day, on the 

 undersides of branches. Their flight period extends from the end 

 of May to mid- July. Neither banding nor arsenical sprays are useful 

 against C. rectangidata, but excellent results are obtained by spraying 

 with an 8 per cent, carbolineum emulsion, applied from January 

 to March. 



