788 EXPERIMENT STATION RECORD. 



uHually iiifents pear trees, but was observed on apricots, jjeaehes, elierries, plum, and 

 apple trees. The inseet is described in its various stajjes. 



The dorsal g-lands of the larvae of Heteroptera, J. (Julde {Ber. Senckenherg. 

 Nitdirf. (leKcll. l!i(l.', I'll. 8'>-lo^', ji/ti. L^). — A lar^a^ nunil)er of species are considered in 

 this study and the anatomical structure and function of the dorsal jjlands in these 

 different species are studied in a comparative manner. These glands are l)elieved to 

 serve the same function us the dermal glands in cockroaches and the defensive glands 

 of myriapods. 



The light organs of native Lampyridae, J. Bongardt {/jKchr. WIsx. Zoo/., 75 

 {][)().>), No. 1, jJp- 1-45, pl-f- S,Jiri>i. 4)- — Tlie author made a detailed study of the 

 anatomy and physiology of the phosphorescent organs in insects of the family 

 Lampyrida^ especially iMrnpyris voctiluca. The light organs were removed and sub- 

 jected to the action of drying, heat, and various gases. It was found that these 

 organs continued to emit light for periods of several days, even when subjected to 

 tlie influence of inert gases, such as carbon dioxid and hydrogen. The Inminosity of 

 the organs, however, soon ceased when these gases were passed over in a constant 

 stream. It is concluded therefore that the cessation of the production oi light is not 

 dne to the influence of the mert gas of itself, but to the action of the gas in motion. 



Urticating larval hairs, E. A. Cockayne (Entomologist, 36 {1903), No. 483, jjp. 

 '201-ii03). — A Ijrief reference is made to a considerable number of species of Lepi- 

 do])tera in which the larvM' bear stinging hairs. 



The plum webbing sawfly, H. T. Fernald [Ent. Nens, 14 {1903), No. 9, pp. 

 H9S-302). — Notes are given on the habits and life history of Lyda rufipci and the 

 insect is described in its various stages. The hiljernating larvte pujaate in IVIarch 

 below the roots of grasses. The length of the feeding jieriod is from 26 to 30 days. 

 This insect has thus far not occurred in large numbers about Andierst, l)ut it is 

 believed that should it l)ecome abundant it would cause considerable damage to plum 

 trees. 



Destruction of the winter eggs of phylloxera by means of lysol, G. Cantin 

 {Jour. Agr. Prat., n. ser., 7 {1904), No. 4, pp- 1.'7 , 128). — The author reports excellent 

 results in the destruction of phylloxera from the use of lysol. This remedy was 

 applied to the trunks of grapes in a 4 or 5 per cent solution. Graj^evines thus 

 treated bore good crops of fruit, while control vines situated under the same condi- 

 tions died within a season or two. 



A new oak-tree pest, 0. P. Lounsbury {Agr. Jour. Cape Good Hope, 23 {1903), 

 No. 6, pp. 655-658, pi. 1). — The author describes Phylloxera corticalis as a new pest of 

 oaks in South Africa, where the number of insect pests of the oak is exceedingly 

 limited. This fact is apparently due to the introduction of seed for raising oaks, 

 thus preventing the simultaneous introduction of oak pests. The species described 

 in the article is considered pierhaps the most injurious of the oak pests of South 

 Africa. In some instances it almost entirely covers the bark and causes the weak- 

 ening or destruction of the trees. Among the natural enenues of this pest the author 

 mentions a ladylnig (7'7.rw//o)//».s vigroiiKicalatKs). 



A knowledge of certain forms of Pieris napi, F. Wagner ( Verhaitdl. K. K. 

 Zool. Hot. Gesell. Wieri, 53 {1903), No. 3-4, pp. 174-178, pi. i).— Notes are given on 

 the variations in color pattern observed in the males and females of Pieris iiapi, espe- 

 cially in forms usually referred to as sulphurea and snlphurcotincta. 



Sirex, II. Faes {Chron. Agr. Canton Vaud, 16 {1903), No. 23,pp.644-647, figs. 3).— 

 Notes on the habits, life history, and means of combating Sirex juvencus and S. gigas. 



Help notes toward the determination of British Tenthredinido9, F. D. 

 MoKK-E {Eut. Mo. Mag., 2. ser., 15 {1903), Nos. 157, pp. 9-14; 159, p]i. 53, 54; 161, pp. 

 114-119; 164, pp. 187-193; 166, pp. 242-245, figs. 9).— The author ])resents an account 

 of the more important anatomical characters of this family of insects for the purpose 



