70 EXPERIMENT STATION RECORD. 



The author believes, therefore, that the weakest sokition used is sufficient to kill all 

 scales with which it comes in contact. In some cases a marked stinuilation of pear 

 trees as a result of spraying with crude petroleum was observed. Spraying with a 

 33 per cent emulsion of petroleum was very effective in destroying apple aphis and 

 elm aphis. 



The elm aphis {Schizoneura ainericana) lays its eggs in crevices of the bark and 

 passes the winter in the egg stage. During summer the attacks of this insect cause 

 the leaves to roll up and some leaves contain a hundred or more plant lice of all 

 sizes. About midsummer the plant lice develop wings and migrate. In September 

 the return migration occurs. These return migrations produce a new brood, which 

 deposits the egg. The only remedy recommended by the author for this species 

 is crude petroleum, as already mentioned. 



The pear-leaf blister mite is reported as having caused the death of some trees at 

 the station. Experiments with kerosene emulsion were carried on and emulsions 

 of 12^, 16§, and 20 per cent kerosene were used. The weaker solutions did not 

 destroy all the eggs, while the 20 per cent solution was very effective. 



Nectarophora pisi, E. D. Sanderson {Canad. Ent., 33 {1901), No. 2, pp. 31-39, 

 pi. 1) . — The author compared series of specimens from American and European 

 sources with the result that the species previously described as A"^. destructor is con- 

 sidered the same as that called A^. jnsi by European authors. The specimens of 

 A^. destructor, upon which measurements were based in the original description, were 

 larger than the average form. Details of measurements of specimens from different 

 sources are given. The author discusses briefly the previous outbreaks of this spe- 

 cies in the United States. The insect is described in its various forms, together with 

 notes on the varieties found on various plants. 



The pea aphis, J. C. Chapais {Nat. Can<id., £8 {1901), No. 2, pp. 17-20).— Briei 

 notes on the habits, life history, and remedies for Nectarophora destructor. 



Some plant lice affecting peas, clover, and lettuce, E. D. Sanderson ( Canad. 

 Ent., 33 {1901), No. 3, pp. 09-74, pi- l,fig- 1) ■ — Descriptive and biological notes on 

 Nectarophora laciucse, Rhopaloslphum lactucse, and Myzus jjergandii. The last-named 

 species is descrilied as new. 



Heliothis dipsaceus and certain other enemies of flax in northern Cau- 

 casus, I. M. Krasilshchik {LyiUzernoraya i 11 Inyanaya sobka i nyekotoruie drugie 

 rrediteli Ina na syevernon Karkazye. St. Petersburg: Minister of Agricultare and Impe- 

 rial Domains, 1900, pp. 61; abs. in Selsk. Khoz. i Lyesor., 199 {1900), Oct., pp. 251, 

 252). — The author gives an account of the life history of this insect and refers to the 

 remedies which have been found effective in combating it. Brief notes are given on 

 Gordius and a fungus disease of the species. Brief mention is also made of Cocliyiis 

 epilinana and Plusia gamma as enemies of flax. 



Insect pests of sugar cane, H. Maxwell- Lefroy ( West Indian BuL, 2 {1901), 

 No. 1, pp. 41-44)- — This paper contains notes on the habits, life histories, and reme- 

 dies to be adopted against Sphenojihorus sacchari, Delphax saccharivora, and the cane 

 moth borer. 



Anatomy and physiology of insects, H. Skinner (Sci. Amer. Sup., 51 {1901), 

 No. 1308, pp. 20fi>;5, 209G6). — A Ijrief general account of insect parasitism and details 

 of the anatomy and functions of various organs which constitute the insect's body. 



The simple eyes of insects, R. Hes.se {Zool. Am., 24 {1901), No. 634, pp- 

 30, 31). — The author reports the results of his studies on the structure of the simple 

 eyes as found in the larvae of a considerable variety of insects. 



Biological notes on the predaceous Hymenoptera, G. Aulerz {E)it. Tidskr., 

 21 {1900) , No. 3-4, pp. 161-200). — The author gives notes on the habits and life his- 

 tory of a number of species, including Animopliiki sabulosa, Miscns campestris, Cer- 

 ceris Jobialu, ami species of Psammophila, Crabro, Pompilus, etc. 



Biology of coprophagous insects, E. A. Bogdanow {Allg. Ztschr. Ent., 6 {1901), 

 No. 3, pp. 35-41).— '^^w 'Author gives brief notes on the habits and life history of 



