26 BULLETIN 1363, U. S. DEPARTMENT OF AGRICULTURE 



The principal Hymenoptera were Hyposoter fugitwus Say and 

 Apanteles anisotae Mues. 



A number of collections of the green-striped maple worm (Ard- 

 sota rubievmda Fab.) were received during 1919 and 1921, most of 

 them coming from Western Massachusetts and New Hampshire. 

 Usually A. rubicunda is to be found in company with Heterocampa 

 guttivitta. The species feeds principally upon maple and hibernates 

 as a pupa. Several specimens of Frontina frenchii Will, and a 

 species of Sturmia have been bred. There is but one rearing record 

 credited to Compsilura. 



COCHLIDIIDAE 



Native species of the family Cochlidiidae are rarely sent to the 

 laboratory and none have ever given Compsilura. Collections of the 

 exotic oriental moth Cnidocampa flavescens Walk, were received in 

 large numbers during 1917 and 1922. The species has but a single 

 generation, the winter being passed in the prepupal stage. During 

 1922 weekly collections of the larvae were received, aggregating nearly 

 1,200 individuals. From this material a single Compsilura was 

 reared, the adult issuing in September. The host value of the species 

 is apparently slight. 



TENTHREDINOIDEA 



The large elm and willow sawfly {Cirribex a/nierieana Leach) is 

 constant in its appearance and is in the field from July until Sep- 

 tember. Only once during a period of eight years has it been abun- 

 dant and then the infestation was confined to a small area. Willow 

 and elm seem the most favored food plants. There is but one gen- 

 eration, the last-stage larva burrowing in the ground and forming 

 its cocoon, where it passes the winter as a larva, pupating in the 

 spring. It offers little attraction to Compsilura. 



Croesus latitarsus Nort. is a very common species found abun- 

 dantly each year on gray birch. It has at least a partial second 

 generation and larvae of this species are in the field from the middle 

 of June until October. The larva passes the winter within its co- 

 coon and pupates in the spring. It is possible that Compsilura at- 

 tacks this species more than is recognized, for the examination of 

 cocoons has revealed a certain amount of unlooked-for parasitism 

 that may be of considerable importance. Dissections have shown that 

 in some instances the cocoons contained adult Compsilura which were 

 unable to work their way out. Culver (gipsy-moth laboratory rec- 

 ords) made a similar finding in his experiments with the last-stage 

 larvae of Bombyx mori, the larvae being freely attacked, the parasite 

 maturing within the host pupa and being unable to emerge because 

 of the tough cocoon. 



Neurotoma fasciata Nort. is a gregarious species commonly re- 

 ceived each year in fair abundance. The larvae feed upon cherry, 

 webbing the leaves together and leaving their nest only when they 

 seek the earth for hibernation. The period of hibernation in New 

 England usualty extends over two seasons. (Larvae collected in Sep- 

 tember, 1920, gave adults in May and June, 1922.) Owing to the 

 extreme difficulty in overwintering the prepupae, very few adults 

 have been obtained. At most, the parasitism of this species by 

 Compsilura is negligible. 



