HOST RELATIONS OF COMPSILURA CONCINNATA 5 



under natural conditions show a much earlier date of emergence. 

 In the field, collections of adults range from May 1 to November 1. 



Table 2. — Showing the emergence of hibernating flies from their host pupw 



( natural environment ) 1 



Date of individual emergence 



Host 



Period of emergence 



1916 

 June 8, 10, 12 



Deilephila gallii Rottemburg 



] 



June 3 



Diacrisia virginica Fabricius 



[•June 3-12. 



June 6, 12 



Callosamia promethea Drury 





1917 

 June 11 



Arsilonche albovenosa Goeze 



] 



June 13 



Apatela brumosa Guen6e 





June 14 



Apatela furcifera Guenfie 



>June 11-15. 





Papilio polygenes Fabricius 



) 



1918 

 May 24, 27 



Diacrisia virginica Fabricius 



>May 24-June 6. 







1919 

 May 27 



Apatela furcifera Guenee 





May 27, 29, 31 .. 



Hvphantria cunea Drury 





May 27, 28, 31... 







May 28-31, June 10 



Euchaetias egle Drury 



>May 27-June 10. 



May 28._ 



Arsilonche albovenosa Goeze 





Mav 29 







Mav31 



Pheosia rimosa Packard 



] 



1921 

 Apr. 12-25 



Papilio polyxenes Fabricius 





Apr. 14 



Hyphantria cunea Drury 











May 14, 16, 24 







May 21 





?Apr. 12-May 28. 



May 21, 23, 28 





i 



May 23.. 







May 23-24 





J 



1922 

 May 1 



Estigmene acraea Drury 



| 



i May 21-June 10 



Euchaetias egle Drury 



J'May 1-June 10. 







1 









i No hibernating records for 1920 were obtained. 



There are other records of Compsilura being reared from over- 

 wintering pupse of Diacrisia virginica, Callosamia promethea, 

 Mamestra picta, Mamestra legitima, Ampelophaga myron, Papilio 

 troilus, Sphinx gordius, Paonias myops, Apatela americana, and 

 Deidamia inscriptum, but since these are all laboratory records, the 

 rearings having taken place under artificial conditions, no mention 

 is made of them in the table. Schizura unicornis, which overwin- 

 ters as a prepupa, has also given Compsilura under laboratory con- 

 ditions. Among the hosts recorded by Culver (#, p. 5) are two spe- 

 cies, Plusiodonta compressipalpis and a geometric! ; the record of the 

 former was dated April 7, 1913. Smith (8) records a rearing of 

 Callosamia promethea, the parasite issuing May 2, 1914. At West 

 Springfield, Mass., in 1915, the same writer succeeded in recovering 

 Compsilura from the overwintering pupa of Diacrisia virginica, 

 two flies issuing May 12 to 15, 1916. The conditions under which 

 the rearing took place are not known. 



STATUS OF HIBERNATING HOSTS OF COMPSILURA 



The abundance of Compsilura in the spring and consequently the 

 degree of parasitism upon the brown-tail and gipsy moths are to 



