366 THE CANADIAN ENTOMOLOGIST. 



In 1888 Dr. D. H. R. von Schlechtendal (Zeits, f. Naturwiss., 

 Halle, ser. 4, VII., (LXI.), p. 416) records having reared this insect 

 from the seeds of Crataegus. He states that the insect usually 

 spends two or three winters in the larval state, only rarely emerging 

 the first spring. He observed oviposition and found that the egg 

 is deposited in the kernel. The ovipositor is inserted through the 

 micropyle, the seed coat being very hard and thick. 



In my former article I stated that the first account of this 

 insect was given by Guérin-Méneville in 1865. This is an error, 

 for over sixty years before Français Berger of Geneva, Switzerland, 

 published (Bull. Sci. Soc. Philomatique Paris, An. XII, 1803, p. 141 

 — wrong pagination for 241) a brief account of its habits and gave 

 excellent figures of the larva, pupa and adult. This article has 

 been overlooked so long because the insect was identified as 

 Ichneumon nigricornis Fab. It is catalogued by Dalla Torre as 

 Ichneumon nigricornis Berger although Berger stated that J urine 

 believed it should go in the genus Chalcis. The Torymus nig- 

 ricornis of Boheman (Svensk. Vet. — Akad. Handl. p. 355, 1833) 

 to which Ichneumo?i nigricornis Fabr. has been referred by Dalla 

 Torre is an entirely different insect. 



Soon after the publication of Bulletin 265 I obtained a copy 

 of a paper entitled, "Commentatio de Torymidis, quarum larvae 

 in seminibus pomacearum vitam agunt," by W. N. Rodzianko, 

 1908, in which he gives an excellent review of the literature relating 

 to Syntomaspis dniparum and gives an extensive account of care- 

 ful rearing experiments. 



THE MIGRATION OF ANOSIA PLEXIPPUS FAB. 



BY F. M. WEBSTER, WASHINGTON, D.C. 



Regarding a phenomenon that has attracted so much attention, 

 as has the migrations of the milkweed butterfly, among scientific 

 men both at home and abroad, more especially of entomologists, 

 we seem to possess a surprisingly limited amount of definite informa- 

 tion. These migrations have been frequently reported in the news- 

 papers and they are often observed by entomologists, as they appear 

 to take the form of scattered bands, but where the members of these 

 bands originate no one seems to know. Not all of the butterflies 

 in a locality join the migration, as, after the bands have appeared 

 from out of the north and passed onward toward the south, there 

 are many others left behind. At least, this is true in the United 

 States, and the writer has observed three of these migratory bands 

 in the last twenty years. 



September 21, 1892, in the clear, calm afternoon, there were 

 iswarms of these butterflies flying about in the city of Cleveland, 



December, 1912 



