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 missionaries 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 from such as are com- 

 paratively innocuous. After this methods will be devised for a 

 wholesale slaughter of the parasites. 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." 



" Mebhe 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 papers, " 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. Hubbard, 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 tfcolytus ruyulosus, but invariably failed to do so. though 

 other entomologists were seemingly able to accomplish this with 

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

 experimental use of kcroseLe. ai.d were later attacked by Ihisbeetle 

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

 insectary, and during the winter and spring of 1897-8 hundreds of 

 individuals of Chiroplatys colon, an English species, previously 

 known iu this country, emerged therefrom, whereas before I had 

 not been able to rear 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 Diaspi* i-o.w, and from these scale insects there emerged 

 myriads ot females of Arrhenophagus clii(>ii<tx/>i<lis Aur., while 

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

 have not given us a single individual, though the Di axpix was 

 present in great numbers. In 1890 the Harlequin Cabbage bug. 



