﻿8 



BULLETIN 1363, U. S. DEPARTMENT OE AGRICULTURE 



The range of Compsilura and the overlapping of generations may 

 be given as follows: First generation, May 24 to July 3 (40 days) ; 

 second generation, June 24 to August 22 (59 days) ; third genera- 

 tion, July 24 to October 1 (69 days) ; fourth generation, August 24 

 to November. 



For the most part it is the progeny of the second to fourth genera- 

 tions that hibernate, for it is rarely that a collection made before 

 September 1 gives Compsilura in the spring. There are exceptions, 

 however, one collection being dated August 22. 



STATUS OF SUMMER HOSTS 



During the latter part of May and the early part of June, Comp- 

 silura finds at hand a good many insects favorable for its develop- 

 ment. The flies that issue first attack the hosts then accessible, and 

 the flies that issue later attack not only those but many more. In 

 Table 3 are listed the known hosts of Compsilura, the horizontal 

 black line indicating the presence of host larvae in the field at the 

 time when they are subject to the attack of the parasite. The records 

 indicate that, although Compsilura may successfully attack early- 

 stage larvae, the intermediate stages are more acceptable. 



Table 3. — Host list of Compsilura concinnata, showing the field appearance of 

 the insects based upon the larval collections received at the gipsy-moth 

 laboratory * 



Hosts 



May 



June 



July 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Jan 



Feb. 



Mar. 



Apr. 



Aglais milberti Qodart 



























Alypia octomaculata Fab- 

 ricius 













Ampelophaga myron \ 



- 











Anisota rubicunda Fabri- 

 cius 





















Anisota senatoria Smith 

 and Abbot. 













Anosia plexippus Linne 



























1 















Apatela brumosa Ouenee 





















Apatelasp _. 





















Arctiid larvae .. 













Arsilonche albovenosa 

 Goeze . 











1 





Autographa brassicae Riley 

 Automeris io Fabricius • 





























Basilarchia archippus 

 Cramer 



Basilarchia astyanax Fab- 

 ricius 



Oallosamia promethea 

 Drury 



Calpe canadensis Bethune-. 



Catocolasp.. 







































- 





















Cerura occidentalis 

 Lintner.. _ _ 







1 

 1 





Charidryas nycteis Double- 

 day and Hewitson 













- 







Cingilia catenaria Drury 











Cirphis unipuncta Ha- 



worth 









Cnidocampa flavescens 

 Walker 







— 







i 

 1 





Croesus latitarsus Norton.. 









° Period in which hosts are subject to attack; period of hibernation (indicating hibe- 



nating hosts from which Compsilura has been reared). Adults of Compsilura concinnata issue from 

 hibernating hosts April to June. 



