982 EXPERIMENT STATION RECORD. 



author's work in combatinfj; nios(inito hlij^ht of tea which is caused by Helopeltis 

 Ihrintni. It ajjpcars from the author's investigation tliat this insect lays its eggs chiefly 

 during the early jtart of the day. During the latter part of March the larval insects 

 are much more numerous than the adults. Statistical data are given showing the 

 relative jiroportion of male and female adults and larva^. 



A junnber of experiments were carried out with insecticides, during which it was 

 found that isolated plats of tea could be practically freed from mosquito blight by 

 catching the insects and spraying with kerosene emulsion. A single application of 

 kerosene delayed the appearance of mosquito blight for about six weeks. In order 

 to obtain comjdete success from the use of this method it is recommended that the 

 whole affected area should be thoroughly treated. 



The pine sawfly (Bd. Agr. and Fisheries [Londun], Leaflet 103, pp. 4, fig. 1). — 

 Notes are given on the habits and life history of IjophyrHs pini. Brief mention is 

 made of the natural enemies of this insect. The pest may be shaken from infested 

 young trees and destroyed or the larvae may be crushed. 



The Mediterranean flour moth, F. L. Washburn {Spec. lipf. State Ent. Minne- 

 sota 1004, Feb., pp. 31, pi. 1, figs. 20). — The Mediterranean flour moth is said to have 

 appeared in large numbers in St. Paul and vicinity quite recently. Descriptions are 

 given of the insect in its various stages and notes are presented on the usual means 

 by which the pest gains entrance to mills and granaries. 



Apparently the chief source of infestation is to be found in old sacks returned to 

 the mill and secondhand machinery from infested mills. .Such material should be 

 thoroughly treated l)efore being received in an uninfested mill. The best jviaterial 

 for fumigation is carbon bisulphid, and this substance should be used in disinfecting 

 old sacks. Cylindrical metal spouts have been devised which have smooth surfaces 

 within and thus prevent insects from accumulating in grooves and depositing their 

 eggs in such locations. Notes are given on belt brushes for cleaning wooden elevators. 

 It has been found that the insects may be destroyed by exposing the spouts, elevator 

 legs, and machinery to low temperatures in winter for a few days. This freezing 

 period must lie followed by a period during which the jiarts exposed are again heated, 

 otherwise the effects of freezing upon the insects are not very marked. 



Other experiments were carried on during which it was found that the moths 

 could fly to considerable distances, but that they could not escape through a wire 

 mosquito netting. Eggs exposed to the vapor of bisulphid of carl)on for a few hours 

 fail to hatch. Good results have been obtained from spraying bisulphid of carbon 

 into infested machinery, spouts, etc. Notes are also given on a number of other 

 insects affecting stored grain, among which are granary weevil, Angoumois grain moth, 

 Indian meal moth, meal snout moth, cadelle, etc. 



Insects injurious to wheat and other stored grains, G. Leonardi {Bol. R. 

 Sniola Superiore Agr. Fortici, 2. ser., 1903, No. 7, pip. 12, figs. 8). — Notes are given on 

 the habits and life history of a number of the common granary insects, with especial 

 reference to the means of combatting them. The author jilaces the greatest reliance 

 in the thorough use of carbon bisulphid. 



A preliminary list of Kansas spiders, T. H. Scheffer {Industrialist, 30 {1904), 

 No. 24, pp. 371-386, figs. 7). — During the author's study of this group of animals it 

 was found that about 100 species occur in Kansas. These si:)ecies are listed with 

 notes on their habits, life history, and economic relations. 



The garden spider and other insects, R. W. Shufeldt {Amer. Inventor, 12 

 {1904), No. 9, pp. 195, 196, figs. 5). — Notes on the habits and life history of the 

 garden spider, saddle-back caterpillar, grass hoppers, etc. 



Galls and insects producing them, M. T. Cook {Ohio Nat., 4 {1904), No. 6, pp. 

 115-147, figs. 7). — In thi.s portion of the author's monograph on galls, attention is 

 called to galls on flowers and fruits as produced by moths, gall mites, and Leijidop- 

 tera. Notes are also given on root galls and on the histology of galls produced by 



