PRESENT STATUS OF INTRODUCED PARASITES. 309 



Chalcis flavipes Panz. 



First received in 1905. Colonized in 1908 and 1909 but in unsatisfactory numbers. 

 Recovered from immediate vicinity of colony site in 1909. Not recovered in 1910. 

 Establishment doubtful on account of small colony. 



PREDACEOUS BEETLES. 



Caosoma sycophanta L. 

 First received in 1906. Colonized same year. Recovered from immediate vicinity 

 of colony site in 1907 . Found generally distributed over limited area in 1909 . Firmly 

 established and increasing and dispersing rapidly. 



PARASITES OF THE BROWN-TAIL MOTH. 



PARASITES OF THE EGG. 



Trichogramma spp. 



First received in 1906. Colonized in 1907; more satisfactorily in 1909. Recovered 

 from immediate vicinity of colony site in 1909. Not recovered in 1910. Establish- 

 ment probable, but the species of no importance as a parasite. 

 Telenomus phal^narum Nees. 



First received in 1906 and colonized satisfactorily in 1907. No attempts toward 

 recovery since made. Establishment hoped for. Not an important parasite. 



PARASITES ATTACKING HIBERNATING CATERPILLARS. 



Pteromalus egregius Forst. 



Received first in 1906. Colonized in large numbers that year and in 1907 but much 

 more satisfactorily in 1908 . Recovered from immediate vicinity of colony site in 1909 . 

 Not recovered in 1910. Found to be generally distributed over very extended terri- 

 tory in 1911. l Apparently well established. 

 Apanteles lacteicolor Vier. 



Received first in 1906. Colonized in 1907. Satisfactorily colonized in 1908. Re- 

 covered in immediate vicinity of colony site in 1909. Generally distributed over 

 considerable area in 1910. Apparently firmly established. 

 Meteorus versicolor Wesm. 



First received in 1906. Colonized satisfactorily in 1908. Recovered in immediate 

 vicinity of colony site in 1909. Generally distributed over limited area in 1910. 

 Apparently firmly established. 

 Zygobothria nidicola Towns. 



First received in 1906. Colonized unsatisfactorily only in 1906-7, but notwith- 

 standing was recovered in 1910 over a considerable territory. 'Apparently firmly 

 established. 



TACHINID PARASITES OF LARGER CATERPILLARS. 



Compsilura concinnata Meig. (See Gipsy-moth Parasites.) 

 Tachina larvarum L. (See Gipsy-moth Parasites.) 

 Dexodes nigripes Fall. 



First received in 1906 and colonized satisfactorily in 1906 and 1907. Still more 

 satisfactorily colonized in 1909. Not recovered. Establishment hoped for. 



EUDOROMYIA MAGNICORNIS Zett. 



First received in 1906. Colonized in about the same numbers as Zygobothria nidicola 

 in 1906 and 1907. Not recovered. Establishment doubtful on account of small size 

 of colonies. 



i Winter of 1910-11. 



