756 EXPERIMENT STATION RECORD. 



" Fertilizers and irrigation do not kill the thrips in the gronnd. They act 

 against them only indirectly, by placing the soil in better condition for cultiva- 

 tion and by strengthening the trees." 



A contribution to our knowledg'e of the British Thysanoptera (Terebrantia), 

 with notes on injurious species, R. S. Bagnall (Jour. Econ. BioL, Jf (JiJO!)), 

 Ko. 2, pp. SS-Jfl ) . — Food plants and localities are recorded for species belonging 

 to the genera Chirothrips, Limothrips, Euthrips, Anaphothrips, Leucothrips, 

 Heliothrips, Fartheuothrips, Aptinothrips, Thrips, and Platythrips. Chirothrips 

 simUis from grass is described as new. Limothrips cerealium {=aven(e) was 

 taken from SoJanttm dulcamara. Euthrips pyri was received from Berkhamsted 

 where it had been taken in plum blossoms. 



Notes on our species of Emesidae, X. Banks (Psyche, 16 (1909), No. 3, pp. 

 Ji3--'i8, figs. 2). — Twelve species representing 6 genera of "skeleton-bugs" are 

 reported from the United States of which 7 are described as new to science. 



Anatomical and histological studies of the digestive canal of Cimbex 

 americana, H. H. P. and H. C. M. Severin (Trans. Wis. Acad. Sci., Arts, and 

 Letters, 16 (1908), pt. 1, No. 1, pp. 38-60, pis. 4). — Studies of the American 

 sawfly. 



Habits of the American sawfly (Cimbex americana), with observations on 

 its egg parasite, Trichogramma pretiosa, H. H. P. and H. C. M. Severin ( Trans. 

 Wis. Acad. Hci., Arts, and Letters, 16 (1908), pt. 1, No. 1, pp. 61-76, pi. i).— This 

 is a report of biological studies of material obtained fi-om peach-leaved willow 

 (Salix amygdaloidcs) and long-leaved willow (S. longifolia) in Milwaukee 

 County, Wis. The sawfly cuts rough gashes through the bark, which extend 

 transversely or nearly so around the branches. The imago first makes its 

 appearance about the beginning of June and disappears toward the middle of 

 July. Five hundred or more eggs may be deposited by the female. 



" The total number of eggs deposited on 100 leaves of the peach-leaved willow 

 was 395, of which only 5 eggs were parasitized by Trichogramma pretiosa, 

 whereas upon the long-leaved willow there were 280 eggs deposited, and of 

 these, 6 were parasitized by this same Hymenopteron. The percentage of eggs 

 which failed to hatch on account of this egg-parasite was therefore less than 2 

 per cent. 



" The number of pupse of T. pretiosa found in the 5 parasitized eggs was, 

 respectively, 15, IS, 22, 25, and 30." 



Aphididae of southern California, II, E. O. Essig (Pomona Jour. Ent., 1 

 (1909), No. 2, pp. 1/7-52, figs. //). — In continuation of an article previously noted 

 (E. S. R., 21, p. 451), notes are contributed on the orange aphis (Ai)his citri) 

 and the walnut aphis (Callipterus juglandicola) which is of great economic 

 importance in southern California due to its damage to walnut trees. The 

 appearance of this species on walnut is so sudden and often occurs in such num- 

 bers that the damage is done before the orchardist is aware of its presence. 



Further studies on the grape phylloxera, B. Grassi and Anna Foa (Atti R. 

 Accad. Lincei, Rend. CI. Sci. Fis., Mat. e Nat., 5. ser., 17 (1908), I, No. 12, pp. 

 753-760; II, No. 8, pp. 31,9-359).— A report of biological studies. 



Further studies on the gall form of the grape phylloxera, B. Grassi and 

 R. Grandori (Atti R. Accad. Lincei, Rend. CI. Sci. Pis., Mat. e Nat., 5. ser., 17 

 (1908), I, No. 12, r>p. 760-770; II, No. 3, pp. 99-106).— A report of biological 

 investigations. 



Results of new investigations in Italy on the biology of phylloxera, par- 

 ticularly the grapevine phylloxera, C. von Janicki (Zool. Zenthl., 15 (1908), 

 No. 12-13, pp. 353-376, figs. 6). — This is an extended review of the investiga- 

 tions of Grassi, Foa, and Grandori, noted above. 



