8 



onion, was briefly alluded to. It appears about the mid- 

 dle of May and continues its ravages until nearly the 

 third week in August, when it changes into the pupa or 



chrysalis state. 



Fie 



IMPORTED CABBAGE CATERPILLAR 

 AND ITS PARASITE. 



was next mentioned. This cat- 

 erpillar during the past summer 

 has been fearfully abundant in 

 gardens in this vicinity, and 

 would have done still greater 

 injury to the growing crops 

 were it not for the presence of 

 the parasite which had been 

 found to prey upon it very ex- 

 tensively. 



The figures annexed illustrate 

 the several stages (Fig. 3, «, 

 male ; b, female ; c, larva ; d, 

 [)iipa) of this invaluable ichneu- 

 mon parasite which is one of 

 the Chalcid family, and is the 

 Pteropi:^ pupio'um of Linnteus. 

 Dr. Packard had supposed that this parasite had i)er- 

 haps been imported with its host, but it is now found to 

 be a native of this country as well as of Europe, and 

 cited authorities confirmatory of this as- i^'r- *■ 



sertion. 



LARVA OF TACmXA. 



Another parasite which he mentioned 

 was the l^u'va of a i)arasitic fly, Tachina l:uvh..i yw, /„;,«. 

 (Fig. 4, enlarged three times), the adult form of whioh 

 closely resembles the common housefly. It is a flattened, 



Parasite of the Imported Cabbage 

 Butterfly. 



