4 Illinois State Laboratory of Natural History. 



the flies had all emerged. Another lot was bred at Normal dur- 

 ing the same season, the dates of emergence from the cocoons 

 being almost the same as for those just mentioned. In 1879, 

 another series was bred from larvaj of this sphinx in August. 

 During August, 1882, and September, 1884, these parasites 

 were also bred from P. celeus, one lot being collected at 

 Normal, and the other at Godfrey. Tbe cocoons of all these 

 specimens were of the usual white kind, with little loose silk. 



The variety of A. congregatus bred by Mr. Scudder from 

 Pieris rapa\ described by Dr. Packard* as Microgaster pieridis, 

 and referred by Dr. Rileyf to the species mentioned (the variety 

 name pieridivora being substituted for pieridis^ because the 

 latter was preoccupied), was frequently bred during the summer 

 of 1886 from larvae of Pieris rapa^, brought to the Laboratory 

 because they showed signs of disease. Especial mention may 

 be made of three lots of the parasites bred by Prof. Garman, 

 the cocoons of one lot being of a lemon-yellow color; those of 

 another being of about the same shade, excepting a slight green- 

 ish tinge in some specimens; and those of the third being creamy 

 white, with scarcely a trace of yellow. Yet there is no men- 

 tionable difference in the adults of the different lots. There 

 were, on an average, about thirty cocoons obtained from each 

 Pieris larva. 



The Apanteles larvae of one set emerged from the skin of 

 their host August 11, and came forth from the cocoons as adults 

 August 29. Another lot formed cocoons September 2, and the 

 adults were found dead in the breeding box September 22. 



On page 104 of the Twelfth Report of the State Entomo- 

 logist of Illinois, Prof. Forbes has described an Apanteles bred 

 from the larvag of Mesographe (Orohena) rimosalis, Guenee, 

 under the name Apanteles orohenoe. A critical examination of 

 a larger series of specimens than was then at hand, shows that 

 this is but a variety of Apanteles congregatus^ distinguished by 

 the dark anterior and intermediate coxa3 and trochanters. In 

 some specimens these p.arts of the front and middle legs are 

 almost as light-colored as in the normal specimens from sphinx 



*Proc. liost. See. Nat. Hist., Vol. XXI., p. 26. 

 tAm. Nat., Vol. XVI., p. (580. 



