I'.i-uj ECONOMIC ZOOLOGY — ENTOMOLOGY. 449 



inyccliiim which apparoutly dotormines the death of the cainbium and is 

 rt'^'anliMt as tlio .specilic ajroiit of the disease is referred to the Saprolefrnineaj. 

 (yVincliisidiis are n jiorled in some ditail. 



Observations on guniniosis of elm, I^. Pktri {Ann. R. Tst. Super. Forcstale 

 Naz. P'innze, 3 (IDll-JS), pp. 75-92, figs. 4)- — A gumming disease of elm la 

 dealt witli in soihc detail in connection with similar or related diseases of 

 this and of various other ti'ees as regards causation and bearings of such 

 diseases. 



A Thelephoraceie on oak, C. RIassa (An?i. R. 1st. Super. Forestale Naz. 

 Fircnze. 3 {1917-JS), pp. 1-31, pU. 2, fujs. 5).— A Thelephoracese (Stereum 

 yausapatum) is described in connection with injuries done thereby to oaks at 

 points in Italy. 



Peri dor uiiuni jjini and its transmission from pine to pine, H. Klebahn 

 {Flora [Jetm], n. ser., 11-12 (1918), pp. 194-207, pis. 2, fig. i).— The author, 

 inoculating young pines directly with P. pini, was able to find infection in about 

 30 per cent of the cases. He considers this a confirmation of the conclu- 

 sions previously announced by Haack (E. S. R., 31, p. 158). 



A supposedly parasitic disease of poplar, L. Petri {Ann. R. 1st. Super. 

 Forestale Naz. Fircnze, 4 {1918-19), pp. 95-lOJi, figs. 5). — Investigation of an 

 intracellular fungus in poplar having negatived the question of its identity 

 with Blepharospora camhivora, the cause of black canker of chestnut, the 

 author gives a review of related or somewhat similar phenomena as reported 

 by other investigators, and as bearing upon the question of a possible symbiotic 

 relation between fungus and host. 



Transference of nematodes from place to place for economic purposes, 

 N. A. Cobb {Science, n. ser., 51 {1920), No. 1330, pp. 6JfO, fi^i).— Attention is 

 railed to the possibility of combating injurious nematodes through the pres- 

 ence of other species which feed upon the parasitic ones. It is considered 

 that many of the practices evolved in the transfer of beneficial insects can, 

 with appropriate modification, be applied to the transference of nematodes. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Trapping on the farm, N. Dearborn {U. S. Dept. Agr. Yearbook 1919, 

 pp. 451-48-i, fiffs. 30). — The author describes the manner in which pests on tlie 

 farm may be turned into profit and the ways in which they may be trapped. 

 Descriptions are given of the various kinds of traps and the ways in which 

 they may be set. Information on the preparation of skins is included. 



The Migratory Bird Treaty {U. S. Dept. Agr., Dept. Circ. 102 {1920), 

 PP- 4)- — The decision of the Supreme Court of the United States sustaining 

 the constitutionality of the Migi-atory Bird Treaty and Act of Congress of 

 July 3, 1918, to carry it into effect, is here presented. , 



The writings of the late C. Gordon Hewitt, compiled by C. B. Hutchings 

 {Canad. Ent., 52 {1920), No. 5, pp. 100-105) .—The writings of the late gov- 

 ernment entomologist of Canada (E. S. R., 42, p. 699) are here listed. 



Report of the duision of entomology, F. Sherman {North Carolina Sta. 

 Rpt. 1919, pp. 54-58). — In control work witA cabbage worm, it was found 

 that weekly dusting witli arsenate of lead and air-slaked lime in the pro- 

 portion of 1:8 is a satisfactory means of control. It was found that an 

 expenditure of about $6 per acre in this work brings an Increased return vary- 

 ing from $50 to $175 per acre in value of product, according to the market. 

 In check plats not dusted, 28 per cent of the plats matured heads, whereas 

 upon plats dusted weekly 75 per cent matured heads. 



