67 



be eliminated, and expensive screens on doors, windows and porches 

 would no longer be needed. It is hoped, with the assistance of the 

 City Health Department, to work on a larger scale next season with 

 a large staff of inspectors. 



Howard (C. W.)- New Tick Records for Minnesota.— J?. Econ. Entom.. 

 Concord, N.H., x, no. 6, December 1917, p. 560. 



Two examples of Ornilhodoriis talaje are recorded from Minnesota, 

 having presumably been sent from Oklahoma in hay used to pack glass. 

 This species has formerly been reported from Florida, Texas and 

 California. Dermacentor cdbipictus is another tick that has recently 

 become established in Minnesota, having in all probability been 

 introduced on wapiti brought from Montana two or three years 

 previously. 



Howard (C. W.). A Suggestion for the Destruction of Cockroaches. — 



Jl. Econ. Entom., Concord, N.H., x, no. 6, December 1917, p. 561. 



As superheating has been found to be a successful method for the 

 control of bed-bugs [Cimex lectidarius] in dwelling houses, it would 

 seem probable that the cockroach, PhyUodromia {Blattella) germanica 

 (croton bug), might be controlled in the same way. The author has 

 conducted experiments to ascertain the degree of heat fatal to this 

 species. Temperatures below 120° F. were variable in their effect, but 

 exposure to a temperature of 122° F. to 140° F. for 20 minutes destroyed 

 them all. This method is difficult to employ, omng to the habit of 

 this insect of hiding in cracks, between walls, etc. Cold has also been 

 found very destructive to this cockroach. Exposure to 24° F. for three 

 hours killed all insects treated, 18° F. killed all in 20 minutes, 10° F. 

 in 5 minutes, and 0° F. in 5 to 10 minutes. Practical tests based upon 

 these observations have not yet been made, but the suggestions are 

 offered for what they are worth. 



Crumb (S. E.) & Lyon (S. C ). The Effect of Certain Chemicals upon 

 Oviposition in the House-fly {Miisca domestica, L.). — Jl. Econ. 

 Entom., Concord, N.FI., x, no. 6, December 1917, pp. 532-536. 



During the summer of 1916, the authors were engaged in investigating 

 the question of the substances in horse manure that stimulate females 

 of Musca domestica to oviposit. It was found that the ether extract 

 possessed this quality in some degree, but that the chief incitant 

 remained after complete ether extraction and was a product of 

 fermentation. Further investigation gave positive evidence that this 

 stimulant was carbon dioxide. Experiments were then carried out 

 for testing more thoroughly the effect of both ammonia and carbon 

 dioxide on fly oviposition. An apparatus was devised, and is described 

 in this paper, for these tests and the results are given in tables. Carbon 

 dioxide was found to give an 82*8 per cent, higher stimulus to 

 oviposition than annnonia. 



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