460 EXPERIMENT STATION RECORD. [Vol. 85 



douglasii in the order named. The mistletoe causes a gradual reduction of 

 the leaf surface of the host plant, trees of all age classes being liable to infec- 

 tion. Excessive mistletoe infection of the lower parts, it is said, may cause 

 the upper portion to die, resulting in the condition commonly called staghead. 

 Seedlings from three to six years old are often killed within a comparatively 

 short time after infection. Where the mistletoe occurs on branches, it usually 

 causes the formation of large witches' brooms which seriously interfere with 

 the life functions of the tree. The author claims that mistletoe can be con- 

 trolled by cutting out and burning the infected trees, particular attention 

 being paid to centers of infection. 



Self-protection by some plants ag-ainst Cuscuta, O. Ge:btz {Jahrb. Wiss. 

 Bot. [Pringsheim], 56 {1915), Pfeffer-Festschr., pp. 123-154). — This deals with 

 the relations of Cuscuta to various hosts as regards protective devices against 

 its parasitic activity, more particularly acids, oils, etc., within the plant itself. 



A bibliography is appended. 



Tree-living nematodes of Switzerland, B. Hofmanner and R. Menzel (Rev. 

 Suisse Zool., 23 {1915), pp. 109-243, pis. 3; abs. in Jour. Roy. Micros. Soc, No. 

 6 (1915), p. 580). — This account of the lacustrine and terrestrial nematodes of 

 Switzerland includes a diagnostic key and increases the number of species to 

 110. Eighteen new forms are described and the genus Criconema is erected. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



A preliminary report upon the economic status of the British species of 

 woodpeckers and their relation to forestry, W. E. Collinge (Jour. Bd. Agr. 

 ILondon], 22 (1915), No. 8, pp. 789-791). — This preliminary report gives the 

 results of an examination of the stomach contents of 91 specimens of three 

 species of woodpeckers. Fully 75 per cent of the food was found to consist 

 of injurious insects. The author concludes that woodpeckers are distinctly 

 beneficial to forestry and merit all the protection that can be afforded them. 



A new bat from Porto Rico, H. H. T. Jackson (Proc. Biol. Soc. Wash., 29 

 (1916), pp. 37, 38). 



[A list of parasites of animals in Guam], B. H. Ransom (Jour. Parasitol- 

 ogy, 2 (1915), No. 2, pp. 93, 94). — A list is given of identifications made of 19 

 species of parasites, including 3 trematodes, 1 cestode, 9 nematodes, 5 arthro- 

 pods, and 1 protozoan, collected by L. B. Barber of the Guam Experiment 

 Station. 



Agricultural entomology (Entomologia Agraria. Florence: R. Min. Agr. 

 Indus, e Com., 1915, pp. 484f figs- 415; abs. in Rev. Appl. Ent., 4 (1916), Ser. A, 

 No. 2, pp. 53, 54)- — A manual of insects injurious to cultivated plants, field and 

 garden crops and their products, and methods of controlling them. 



[Economic entomology] (Ztschr. Angew. Ent., 2 (1915), No. 2, pp. V-{-265~ 

 471, figs. 63). — The papers presented in this number include the following: 

 A Contribution to the Biology of the Body Louse (Pediculus vestimenti), 

 by A. Hase (pp. 265-359) ; The Wheat Bulb Fly (Hylemyia coarctata), A 

 Contribution to the Knowledge of Its Biology and Its Economic Importance, by 

 R. Kleine (pp. 360-389) ; List of Parasitic Hymenoptera Reared at the Im- 

 perial Plant Protection Station, Vienna, by F. Ruschka and L. Pulmek (pp. 

 390-412) ; Calosoma sycophanta. Its Life History and Distribution, etc., 

 together with Notes on C. inquisitor, by G. Holste (pp. 413^21), the former 

 being a review of work by the Bureau of Entomology of the U. S. Department 

 of Agi-iculture ; New and Little-Known Plant Pests fi'om Our Colonies, by F. 

 Zacher (pp. 422-A2Q) ; etc 



