151 



Of the food plants of the adult in the South I know but little. Its 

 congener, D. longicornis, is very fond of the blossoms of the cotton 

 plant, which may be also the case with this species. 



Pliorodon mahaleb. — This appeared at La Fayette the present season 

 on potato vines, and several generations were reared from the infested 

 plants. 



Smynthurus hortense. — These active little insects were extremely 

 abundant in Indiana the present season. About La Fayette I observed 

 them feeding upon young cucumber-plants, the injured parts of plant 

 not being affected by other insects or fungus. They were also reported 

 by Mr. C. G. Boemer as injuring young tobacco in Switzerland County 

 during the month of May. 



SOME OF THE BRED PARASITIC HYMENOPTERA IN THE NATIONAL 



COLLECTION. 



(Continued from p. 18), 

 Family ICHNEUMONID-ffl, 



Subfamily Ichneumoninae. 



Parasites. Hosts. 



Ichneumon cseruleus Cr Undetermined pupa {Arctia f). St. Louis, 



Mo., April 4, 1872. 



Ichneumon malachus Say ^ Spilosoma virginica F. St. Louis, Mo., April 



17 and March 29, 1871 ; January 12, 1874. 



Ichneumon subcyaneus Cr Spilosoma virginica Y. St. Louis,Mo.,April. 



Nematus ventralis Sa3\ Washington, D. C, 



Augusts, 1886. 

 Collected also in North Carolina, New York, 

 New Jersey. 



Ichneumon unifasciatus Say Acronycta o6?ini/a Sm. and Abb. St. Louis, 



Mo., 1870. 

 Arctia s]^. St. Louis, Mo., April 28, 1874. 

 Received also from Wisconsin and Illinois. 



Ichneumon puerilis Cr Noctuid? Washington, D. C, April 28, 1874. 



Ichneumon rufiventris Brull6 Pyrameis cardui L. St. Louis, Mo., Sep- 

 tember 1870. 

 Collected also in Virginia and Pennsyl- 

 vania. 



Ichneumon signatipes Cr Spilosoma virginica F.St. Louis, Mo., June 



6, 1867 ; September 1870. 



Ichneumon lewisii Cr Arctia sp. St. Louis, Mo., May 30, 1870. 



Ichneumon jucundus Brails HadenadevastatrixBv3ice. LaFayette, Ind., 



July 23, 1886. 

 Collected also in District of Columbia, Vir- 

 ginia, and Montana. 



Ichneumon pravus Cr Fidonia faxonaria Miuot. St. Louis, Mo., 



June 6, 1878. 

 Ichneumon wilsonii Cr . Acronycta on black birch. March 14, 1884. 



