MACROLEPIDOPTERA AND THEIR PARASITES 3 
species, in which case the States only have been listed, and also in- 
cludes any accumulated data on its importance as a pest): (3) totals 
received (listing the number of collections, the number of larvae, and 
the number of years it was represented in the collections); and (4) 
monthly occurrence of larvae, pupae, and adults (after each of these 
stages are listed the periods of occurrence, by months). 
This will give the reader an idea of the geographical range of the 
collections and indicate whether the species had been generally com- 
mon over a period of years or had appeared in abundance for only one 
or two seasons. 
All this information is based on data received with the field collec- 
tions or from observations and rearing records made by the labora- 
tory staff. Further rearings, in many cases, may prove that the peri- 
ods of occurrence of the different stages mentioned are not broad 
enough, and that the food-plant lists may be increased for certain 
species. 
Although much has been written regarding food plants and the 
periods of occurrence of larvae, pupae, and adults in the field, it is the 
writers’ belief that many of the data given herewith have not been 
published and that they should help materially to make the informa- 
tion on the subject more complete. 
The actual number of specimens of each parasite reared from the 
collections is given in the host-parasite list whether or not the species 
is gregarious, except in the case of certain hymenopterous parasites 
which normally issue from a single host individua! in large numbers. 
Such parasites usually fill the body of the host with their pupae or 
issue from the host as larvae and form cocoons more or less in masses. 
In each of these cases the number of parasitized hosts has been listed, 
the figure indicating the number being preceded by an asterisk. 
The number of years each species of parasite has been recovered, 
the number of collections of the host that have produced the parasite, 
and the number of host larvae that were in the collections from which 
the parasite issued, have been given in order to show the prevalence 
of that particular ‘parasite from year to year and also to show its 
relative importance. 
Under each parasite in the parasite-host list has been given: (1) the 
hosts from which it was reared; (2) the localities from which its hosts 
' were received (except in the case of a parasite that was quite general in 
distribution, in which case the States only were listed); (3) the months 
in which the adults are known to occur; (4) the number of specimens 
per host; (5) the number of generations; (6) the stage in which it 
hibernates, and occasionally other incidental information. 
MISCELLANEOUS DIPTERA 
Occasionally specimens of Muscidae, Anthomylidae, and Sar- 
cophagidae have been reared from the field-collected material, some 
of which had been obtained in the pupal stage. 
Only species that are unquestionably parasitic have been included 
in the list. Their status in this respect has been doubtful in the cases 
of some of the species that have been reared. With the exception of 
Museina stabulans Fall., they have been recovered only on one or 
two occasions. Aithough M. stabulans has been reared from several 
hosts, and the writers believe that it is sometimes parasitic, the records 
indicate it is unimportant in this capacity. 
