792 EXPERIMENT STATION RECORD. 



The species discussed include elm gall-louse, box-elder plant-louse, woolly aphis, 

 currant aphis, apple aphis, cabbage aphis, and wheat plant louse. Brief notes are 



also give the methods of combating these species and on their distribution in 



Montana. 



Sixth annual report of the nursery inspector for the State of Wisconsin, 

 C. Bxjes and E. P. Sands-ten (Wisconsin Sta. Rpt. 1004, pp. 271-278).— During the 

 year under report 29 nurseries were inspected. The San Jose* scale was not found in 

 any of these nurseries or elsewhere in the State. Notes are given on the injurious 

 attacks of strawberry-root louse, white grubs, strawberry-leaf roller, rose chafer, 

 leaf hoppers on apples, pear slug, maple scale, onion maggot, crown gall, asparagus 

 rust, etc. 



Practical results from combating agricultural pests, A. L. Herrera (Com. 

 Par. Agr. [Mexico], Oirc. 11, pp. 49, ph. 3).— Brief notes are given on the results 

 w hich have thus far been obtained in the use of insecticides and fungicides in con- 

 trolling injurious insects and fungus diseases of coffee and other economic plants in 

 Mexico, as well as in the destruction of rats and other injurious animals and the 

 protection of beneficial lards. 



Insecticide experiments for 1904, J. B. SMrrn (New Jersey Stas. /.'»/. 17S, pp. 

 8). — During the season, experiments were made with a great variety of insecticides 

 in destroying San Jose scale. The Universal insecticide and scale killer, Salimene 

 and "Con. Sol.," appear to have no value for this purpose. Horticultural Com- 

 pound was also of little use, but may be effective against plant lice. The same may 

 be said of J'yrol Tree and Plant Spray, and of Rose-leaf tobacco extract. Crude 

 petroleum was used with excellent success and is recommended as the best insecti- 

 cide for application on pear trees. 



Kill-< )-Scale appeared to be effective hut the market price is so high as to he pro- 

 hibitive. Caustic soda proved to be absolutely ineffective. Lime and sulphur mix- 

 tures were used with more or less effect. Lime, sulphur, and caustic soda was 

 applied with unsatisfactory results and the same may be said for sulphite of soda. 

 Potassium sulphid was found to be quite effective. Lime, sulphur, and salt, pre- 

 pared by boiling, was quite successful on peach and plum. Whale-oil soap was used 

 in small quantities but gave good results. Brief notes are also given on a kerosene 

 and limoid mixture. 



Report on scientific work in the field of entomology during 1900, R. Lucas 

 (Arch. Naturgesch., 67 (1904), IT, No. 2, 2. half, pp. 289-944).— -An extensive bibliog- 

 raphy is presented of literature relating to hymenoptera and lepidoptera published 

 during the year 1900. 



The metamorphosis of insect larvae, J. Dewitz (Zool. Anz., 28 (1904), No. 5, 

 pp. 166-182).— -It was found possible to check the development of the larva- of 

 Lucilia csesar by maintaining them in glass tubes without a sufficient quantity of 

 oxygen. It was also found possible to check the development of insect larva; con- 

 siderably try subjecting them to the action of hydrocyanic-acid gas. 



In these experiments the larvae of gypsy moth, brown-tail moth, and Tortrix pil- 

 leriOna were used. Apparently the development of the wings of insects is brought 

 about by the action of certain enzyms which are found in these embryonic struc- 

 tures. It is possible, therefore, to prevent the development of the wings by bringing 

 unfavorable influences to bear upon the enzym. This condition may best be secured 

 by the use of alcohol or dilute acids. It is thus easy to hinder the development of 

 the wings in the pup* of certain flies by treatment with dilute acetic acid. 



The development of the intertines in insects during metamorphosis, P. 

 Deegener (Zool. Jahrb., Abt. Anat. u. Onto;/. Thiere, 20 (1904), No. 4, pp. 499-676, 

 ph. 12). — The investigations reported in this paper were confined chiefly to a beetle 

 Cybister rceseli. An elaborate microscopical study was made of the development of 

 the various parts of the alimentary tract in this insect during the course of its nieta- 



