﻿HOST RELATIONS OF fOMPSILURA 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 hihernating flies from- their host pupae 



(natural e^ivironmenty 



Date of individual emergence 



Host 



Period of emergence 



1916 



JimeS, 10, 12 



June 3 



June 6, 12 



1917 



June 11 



Jime 13 . 



June 14 



June 15 



1918 



May 24, 27 



June 6_ -- 



1919 

 May 27 



May 27, 29,31 



May 27, 28,31 



May 28-31, June 10. 



May 28 



May 29 



ISIaySl 



1921 



Apr. 12-25 



Apr. 14 



May 4 



Mav 14, 16, 24 



May 21 



May 21, 23, 28 



May 23 



May 23-24 



1922 

 May 1 



May 21-June 10 



May 15 



Deilephila gallii Rottemburg.. _ 



Diacrisia virginica Fabricius 



Callosamia promethea Drury. 



Arsilonche albovenosa Goeze -.. 



Apatela brumosa Guenfie.- 



Apatela furcifera Guenfie,. 



Papilio polyxenes Fabricius 



Diacrisia virginica Fabricius 



Schiizura concinna Smith and Abbot 



Apatela furcifera Guenfie.-- 



Hyphantria cunea Drury 



Apatela brumosa Guenge 



Euchaetias egle Drury 



Arsilonche albovenosa Goeze 



Pontia rapae Linn6 



Pheosia rimosa Packard 



Papilio polyxenes Fabricius 



Hyphantria cunea Drui y _ 



Paonias myops Smith and Abbot 



Pontia rapae Linnfi.. 



Arsilonche albovenosa Goeze 



Apatela furcifera Guen6e 



Apatela americana Harris 



Estigmene acraea Drury 



Estigmene acraea Drury 



Euchaetias egle Drury 



Thanaos sp 



^June 3-12. 



Juno 11-16. 



^May 



May 27-June 10. 



'Apr. 12-May 28. 



■May 1-June 10. 



1 No hibernating records for 1920 were obtained. 



There are other records of Compsilura being reared from over- 

 wintering pupse of Diacrisia vii^gimca^ Gallosaima pro7nethea, 

 Mamnestra picta, Mmnestra legitiina^ Ampelophaga myron, Papilio 

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

 Deidamia inscrijytum, 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 geometrid ; 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 fr'om the overwintering pupa of Diacrisia virginica^ 

 two flics issuing May 12 to ir>, 191G. The conditions under which 

 the rearing took place are not known, 



STATUS OF HIBERNATING HOSTS OF COMPSILURA 



The abundance of Compsiluia in the spring and consequently the 

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



