420 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 5 



dry. A single female in captivity killed 17 out of 20 Tyroglyphid 

 mites in a day. Hence it will be seen that even in the adult stage 

 alone, a great number of victims will be killed under favorable condi- 

 tions, perhaps scores or even hundreds, by a single Cheyletid. 



The Value of the Predaceous Habit as a Check upon the Ravages of 

 Certain Pernicious Mites 



Several entomologists have noticed the value of this species and 

 others of the same genus in holding in check mite enemies of stored 

 grain. Just how effective it is may be learned from the following: 

 When the writer received the sample of milled wheat infested with 

 millions of cheese mites (Tyroglyphus sp.) a careful examination of 

 the same revealed but a few individuals of Cheyletus seminivorus 

 Pack. Among the myriads of Tyroglyphids which swarmed in the 

 ground grain scarcely any dead ones could be found. A short time 

 after then I examined the same sample and found that out of 100 

 Tyroglyphids counted, 95 were dead and shriveled, 1 was dead but 

 not shriveled, and only 4 were alive and active. Now the Cheyletids 

 were common and everywhere busy seizing the Tyroglyphids and 

 sucking their juices. Thus in a short period of only a few days this 

 predaceous species had multiplied and destroyed about 95 per cent of 

 the pernicious Tyroglyphids. 



FEDERAL QUARANTINE NOTICES 



Mediterranean Fruit Fly {Ceratitis capitata Wied.) Under authority of the 

 Plant Quarantine Act, Acting Secretary of Agriculture, Willet M. Hays has declared 

 a quaiantine against the following fruits grown or shipped from the territory of 

 Hawaii: AUigator pears, Carambolas, Chinese ink berry, Chinese orange, Chinese 

 plums, Coffee berries. Damson plum, Eugenias, Figs, Grapes, Grapefruit, Green 

 peppers, Guavas, Kamani seeds, Kumquats, Limes, Loquats, Mangos, Mock orange. 

 Mountain apple. Natal or Kaffir plum, Oranges, Papaya, Peaches, Persimmons, 

 Prickly pears. Rose apple. Star apple, String beans, and Tomatoes. 



Potato Wart (Chrysophlytis endobiotica Schib.) Quarantine has likewise been 

 declared against potato wart, potato canker, black scab etc. and the importation 

 of potatoes forbidden from the following countries: Newfoundland, the islands of 

 St. Pierre and Miquelon; Great Britain, including England, Scotland, Wales and 

 Ireland; Germany; and Austria-Hungary. 



