15 
In Nanaimo, in 1922, the white eggs were very abundant, but owing to the 
immense number of larvse present the percentage was only about 35 * * * 
Numbers of larvse collected here contained so many maggots of apparently 
equal vigor that very few completed their feeding and but few puparia were 
obtained. 
In addition to T. metta and T. robusta, three sarcophagids, S, 
* houghii Aldr., S. aldrichii Pk., and Agria affinis Fall., and three 
Hymenoptera, Ephialtes pedalis (Cress.), Theronia fulvescens 
(Cress.), and Amblymerus liparidis Vier., are recorded as being 
parasitic on the satin moth in British Columbia. They were con- 
sidered to be of little importance as control factors. 
PREDATORY ENEMIES 
Birds undoubtedly consume many larvse of the satin moth. Mosher 
made some special studies to determine the relationship of birds to 
the satin moth and recorded the following species as feeding on 
them : Black-billed cuckoo, Coccyzus erythrophthaimus; oriole, Icterus 
gdlbula; blue jay, Cyanocitta cristata cristata; starling, Sturnus 
vulgaris, and catbird, Dumetella carolinensis. On numerous occa- 
sions the junior author has noted blue jays and starlings apparently 
picking the small satin moth larvae from their hibernating webs on 
heavily infested poplar trees. Western robins and bats have been 
reported as feeding on the satin moth at New Westminster, British 
Columbia. Toads have been observed to take the larvae, and several 
spiders have also been noted as their enemies. 
DISEASE 
There is no positive evidence that larvae of the satin moth are 
attacked in this country by the disease commonly known as " wilt." 
Larvae are occasionally observed in the field attached to the tree 
trunks by their anal prolegs, with the head hanging downward in a 
position similar in appearance to the characteristic position in which 
caterpillars are found which have died from the wilt. On two of 
these occasions, when the situation was further investigated, it was 
found that in one place the foliage had been sprayed, indicating that 
the larvae had been poisoned. At the other location several dead 
larvae were examined, and each one was found to contain a tachinid 
maggot. 
In the food-plant experiments which have been carried on at the 
laboratory for the last few years there has been no evidence that the 
larvae die from wilt. However, in some of the large trays used for 
feeding large numbers of satin moth larvae which had been collected 
to obtain Compsilura for colonization, caterpillars have been found 
which had the characteristic appearance of having died from wilt. 
3 In the summer of 1925 a number of these dead larvae were sent for 
examination to R. W. Glaser, of the Rockefeller Institute, who re- 
ported that in this material there was no evidence of the wilt disease. 
EFFECT OF INTRODUCED ENEMIES OF THE GIPSY MOTH AND BROWN-TAIL MOTH 
ON THE SATIN MOTH 
The gipsy moth and the brown-tail moth became established in the 
New England States in the utter absence of the insect enemies which 
attack them in the Old World, but this is not the case with the satin 
