882 EXPERIMENT STATION RECORD. 



50 miles in length and causes such serious depredations that it lias acquired 

 the name of ringbarker. This name is due to the fact that trees are so badly 

 injured as to be suspected of dying of ringbarking. The habits of Extatosoma 

 tiaratum are also discussed. 



The Gryllidse and wingless Locustidae, W. W. Froggatt (Agr. Gaz. N. 8. 

 Wales, 16 (1905), No. 5, pp. 4.77-481, pi. 1). — The biology and habits of these 

 2 families of insects are briefly outlined and special notes are given on Austra- 

 lian cricket, mole cricket, and a number of locusts of economic importance. 



The Black Hills beetle, with further notes on its distribution, life history, 

 and methods of control, A. I). Hopkins (V. 8. Dept. Agr., Bur. JJnt. Bui. 56, 

 ])]>. 24, pis. 2, figs. 6). — Notes are given on the literature relating to Dendroeto- 

 7iiix ponderosw. This pest was studied in Pikes Peak forest reserve and was 

 found not to occur so abundantly as had been supposed. It is, however, the 

 most destructive pest of pine timber in that region. 



The insect is described and notes are given on the galleries produced by it 

 in infested trees and on its life history. The beetle apparently withstands 

 great extremes of drought and cold. Trees struck by lightning or injured by 

 storms or fire are most frequently attacked. The natural enemies of this pest 

 appear to have little influence in controlling it. The only practical method 

 suggested for the control of this pest is to cut all infested trees between the 

 middle of October and the 1st of May. 



Gall gnats injurious to osiers and willows, R. S. Macdougall (Jour. Bd. 

 Agr. [London], 12 (1005), No. 8, pp. 499-503, figs. 5).— The feeding habits of 

 the larvae of this group of willow pests vary considerably, but all known species 

 are found in characteristic galls on twigs, flower buds, or leaves. 



Detailed descriptive notes are given on Cecidomyia saliciperda, C. salicis, 

 C. rosaria, C. terminalis, C. heterohia, and C. marginem-torquens. In general 

 the only effective remedy consists in removing and burning the galls before the 

 occupants escape. 



A treatise on the acarina, or mites, N. Banks (Proc. U. 8. Nat. Mus., 28 

 (1905), pp. 1-114, figs. 201). — The internal and external anatomy of mites is 

 discussed with special reference to those features which may be used in a 

 scientific system of classification. Tables are presented to assist in the identi- 

 fication of the superfamilies, families, genera, and species of this group of 

 animals. The more important species are discussed in some detail with brief 

 reference to their economic significance. 



The mosquito blight of tea, II. H. Mann (Indian Tea Assoc. [Pamphlet] 1, 

 1905, pp. 19, pi. 1). — It has been shown that on isolated fields of tea this pest 

 may be practically exterminated in one season by pruning and spraying with 

 kerosene emulsion. The cost of this treatment is not excessive. 



A number of experiments were carried out to test the value of hand picking 

 the insects through the agency of boys. In this work it was found necessary 

 to assign one boy to each 5 acres of tea. The kerosene emulsion used in the 

 author's experiments was made up of 1 to 2 lbs. of soft soap and 2 gals, of low- 

 grade kerosene per 50 gal. of water, and was applied at the rate of 150 gal. 

 per acre. 



Preliminary experiments in dipping nursery stock, F. W. Faurot (Mis- 

 souri Fruit 8ta. Bui. 14, .pp. 7). — In the spring of 1904 some dipping experi- 

 ments were undertaken with nursery stock. 



Two lots of trees were divided into ."> bunches each and one of these lots was 

 treated with lime-sulphur-salt in full strength, one-half strength, and one-fourth' 

 strength, while the other lot was dipped in formalin for one-half hour, 1 hour, 

 and 1+ hours, respectively. The formalin solution was made at the rate of 1 pt 

 to 30 gal. of water, and the full strength lime-sulphur-salt wash, according to 



