70 ENTOMOLOGICAL NEWS. [March 



the Colonial Office the -scientists connected with the British Mu- 

 seum are collecting mosquitoes from every part of the world. 



They have requested missionary societies and pioneer colonization 

 companies to ask their missionax-ies and agents to assist in the work 

 by sending as many specimens as possible, live bugs being pre- 

 ferred. 



The object of the scheme is to classify the various species, in order 

 to distinguish the disease-spreading kinds Irom such as are com- 

 paratively innocuous. After this methods will be devised for a 

 wholesale slaughter of the paras^ites.— Philadelphia Press. 



*' Let it alone, Willie," said the bad boy's mother. " Don't try 

 to tear it open. It will be a beautful moth next year." 



" Mebbe it will, and mebbe it won't," replied the bad boy, pro- 

 ceeding to dissect it. " All co " coons" look alike to me "—Chica- 

 go Tribune. 



All friends and correspondents of the lamented Mr. H. G. Hub- 

 bard, who have not yet received copies of his papei's, " The Insect 

 Guests of the Florida Land Tortoise" (with "Additional Notes," 

 etc. ,and " The Ambrosia Beetles of the United States," may obtain 

 such by sending their addresses to the undersigned at the United 

 States Department of Agriculture, "Washington, D. C Various 

 other papers bv Mr. Hubfcaid, mostly published in the Proc. 

 Entomological Society, ot "Washington, are also still available for 

 distribution. E. A Schwarz. 



On the Sudden Appearance and Disappearance of Some Spe- 

 cies OF Insects. — Apropos to the several notes in the February 

 number of Entomological News, relating to the sudden appear- 

 ance of some insects in great numbers, where they had before been 

 rarely, if at all, observed, and the equally sudden disappearance of 

 other species, it may be interesting to know of similar phenomena 

 in Ohio. For years I had been trying to rear hymenopterous para- 

 sites from iScolytus rugulosus, but invariably failed to do so, though 

 other entomologists were seemingly able to accomplish this with 

 little trouble In 1897 several young Iruit trees were killed by the 

 experimental use of kerosene, aid were laler attacked by 1 his beetle 

 These trees were cut in sections and placed in small boxes in the 

 insectary, and during the winter and spring of 1S97-8 hundreds of 

 individuals of Chiroplatys colon, an English species, previously 

 known in this country, emei'ged therefrom, whereas before I had 

 not been able to i-ear a single one. In the fall of 1897 some canes of 

 wild blackberry were taken from a gully near "Wooster and placed 

 in the insectary of the Experiment Station . These canes were badlly 

 infested by Diaspis rosoi, and from these scale insects there emerged 

 myriads ot females of Arrhe7iophagus chionaspidis Aur., while 

 canes from precisely the same spot, brought in in the Fall of 1898, 

 have not given us a single individual, though the Diaspis was 

 present in great numbers In 1896 the Harlequin Cabbage bug. 



