1917] ECONOMIC ZOOLOGY ENTOMOLOGY. 753 



fungus rarely occurs below the sixtieth degree of latitude. So far the fungus 

 has not been discovered in forest nurseries, but from the fact that natural 

 reproductions succumb very readily to attack it is considered a possible menace 

 in all nurseries where firs are grown. 



Pinus ponderosa and P. Jeffrey!, hosts for Razoimiofskya americana, J. R. 

 Wexb {Phytopathology, 6 (1916), No. 6, p. 414)- — In addition to P. contorta 

 and P. banksiana, the author reports the above species as host plants for this 

 dwarf mistletoe. 



A preliminary report on the occurrence of western red rot in Pinus pon- 

 derosa, W. H. Long (U. S. Dept. Agr. Bui. 490 {1911), pp. 8).— A more extended 

 account of investigations already noted (B. S. R., 35, p. 655). 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Nematode parasites of mammals of the orders Rodentia, Lagomorpha, 

 and Hyracoidea, M. C. Hall {Proc. U. S. Nat. Mus., 50 {1916), pp. 1-258, pi. 1, 

 figs. 290). — This systematic work includes descriptions of 2 superfamilies, 5 

 subfamilies, 1 tribe, 8 genera, and 11 species new to science. A list of hosts 

 and their parasites, a bibliography of 16 pages, and a complete index are 

 included. 



Diagnosis of plague in rats, C. L. Williams {Pub. Health Rpts. ITJ. S.'\, 

 SI {1916), No. SS, pp. 2199-2205) .—" In the presence of an epizootic of plague, 

 macroscopic examination alone for the detection of rodent plague results in 

 appreciable error; the microscopic examination of smears should therefore be 

 employed as a supplement to the naked-eye diagnosi ' rodent plague when the 

 epizootic declines. This error is greater toward the o.id of an epizootic and is 

 of particular Importance when eradicative measures are being employed. By 

 routine examination of smears a materially Important number of infected rata 

 may be discovered that would otherwise pass undetected." 



Propagation of wild duck foods, W. L. McAtee {U. S. Dept. Agr. Bui. 465 

 {1917), pp. 40, figs. 35). — This bulletin supersedes Biological Survey Circular 

 81 and Department Bulletin 58, previously noted (E. S. R., 25, p. 757; 30, 

 p. 545). 



Beport of the entomological department, J. Troop {Indiana Sta. Rpt. 1916, 

 pp. 41, 42). — In observations made in breeding cages and in the orchard with 

 the codling moth it was found that the moths did not appear at any definite 

 time but extended over a period of more than two weeks. In examinations 

 made of orchards of progressive fruit growers it was found that they had prac- 

 tically no trouble with the codling moth, thus indicating that the trouble which 

 certain growers experienced was local and probably due to faulty spraying. 



An outbreak of flea beetles on corn took place in Orange County and the 

 southern part of Lawrence County, the corn being attacked when from 2 to 4 

 in. in height. 



In experiments with washing powders as insecticides it is stated that 

 Pearline and Snow Boy both spread well, kill all aphids hit, and do not injure 

 the plants. It is recommended that Pearline be used at the rate of two table- 

 spoonfuls to a pint of water and Snow Boy at the rate of one tablespoonful to 

 a pint of water. 



Report of the south, coast laboratory, B. G. Smyth {Rpt. Bd. Conirs. Agr. 

 P. R., 4 {1915), pp. 45--50). — This report relates particularly to biological 

 studies at Santa Rita of eight species of scarabeid beetles known to injure 

 sugar cane or to be found in sugar-cane fields in Porto Rico, namely, Lachno- 

 stema " grande," L. " media," L. " pequena," lAgyrus tumulosus, Strategus 

 titanu^, S. quadrifoveatus, Dyscinetus trachypygus, and D. barbatus. The com- 



