26 



successfully checked further injury in the following year. In the 

 course of 1916 frequent inquiries were received about bean weevils 

 [Bruchus], white pine weevil [Pissodes strobi], gipsy moth [Lymcmtria 

 dispar], red-humped apple-tree caterpillar [Schizura concintia], carrot- 

 rust fly [Psila rosae, ¥.], grape plume moth [Oxyptilus periscelidactylus], 

 pear midge [Contarinia pi/rivora] and tarnished plant bug [Lygvs 

 pratensis]. Aquatic Dipterous larvae collected in a millc can were 

 also received during the year. 



BowELL (E. W.). Larva of a Dipterous Fly feeding on Helicella itala. 

 — Proc. Malacological Soc, London, xii, pt. 6, November 1917, 

 p. 308. 



Some Dipterous larvae recently found destroying a mollusc, Helicella 

 itala, in Surrey have been bred out and found to be those of Sarcophaga 

 7iigriventris, Meade. 



HoBLEY (C. W.). Life-History of the Coconut Beetle. — Jl. E. Africa 

 & Uganda Nat. Hist. Soc, Nairobi, vi, no. 11, March 1917, 

 pp. 189-190. [Received 15th November 1917.] 



Oryctes monoceros is a great pest in the coconut plantations on the 

 coast in East Africa. The adult beetle bores into the trunk to oviposit, 

 and the larvae hatch out and feed on the interior of the stem, retarding 

 its growth and often killing young plants. The duration of the egg- 

 stage is 12 days, that of the larval stage 3 months, of the pupal 

 stage 40 days, while the length of adult life is unknown. 



Clausen (C. P.). Citrus Culture in Japan, China and Formosa. — 



Mthly. Bull. Cal. State Commiss. Hortic, Sacramento, vi, no. 10, 

 October 1917, pp. 379-383, 3 figs. 



In Japan much injury is done to citrus trees by whiteflies and 

 various other insect enemies. The control of scale-insects is usually 

 attempted by fumigation, but this is proving a very expensive method. 

 The process is generally carried on in the daytime, oiled paper tents 

 being used instead of canvas ; these are cheaper, but less durable, and 

 require constant patching. In China the insect pests of citrus are 

 not nearly so numerous or destructive as in Japan and it is very seldom 

 that infestation is serious. A large Cerambycid borer, however, has 

 been known to cause extensive injury, the larvae boring into the trunk 

 and larger branches and frequently girdhng the tree. The only 

 remedy is to cut out the larvae with a knife. 



ViCKERY (R. K.). The Selection of Petroleum Insecticides.-— JM^?/. 

 Bull. Cal. State Commiss. Hortic, Sacramento, vi, no. 10, October 

 1917, pp. 384-387. 



This paper discusses the various forms of petroleum insecticides 

 and the importance of selection with a view to possible injury to 

 plants. The concentration of oil in water must be the minimum "that 

 will kill the insect, so that injury to the plant may be as slight as possible. 

 The question of application of the oil is simply mechanical where 



