New Yorx AGricuLTuRAL EXPERIMENT Station. 309 
evidently a scavenger. Both species were kindly identified by 
Mr. D. W. Coquillett. 
The second group, the hymenopterous parasites, are probably 
more effectual in keeping the forest tent-caterpillar and other 
insects in check, because they are usually much more abundant. 
The following species have been recorded as preying upon the 
caterpillars: Limneria fugitiva Say, recorded®® by Riley, and Pim- 
pla pedalis Cres., by Wm. Saunders.** From the 2,500 cocoons kept 
by the writer in the laboratory 287 individuals of the species 
— Pimpla conqusitor were reared, of which 218 were females, leay- 
ing 69 males; Pimpla pedals, two females and one male; Z’heronia 
fulvescens, one male. The following species kindly identified by 
Mr. Wm. H. Ashmead, assistant curator of the U. S. National 
Museum, were also reared from these cocoons: Diglochis 
(Phromalus) omnivorous Walk.; Muotiopis clisicampae Ashm. 
As shown on page 304 but 312. or only about 123 per ct. of the 
2,500 cocoons were parasitized. 
Disease.—A. disease, evidently bacterial, attacked many of the 
caterpillars last season materially reducing their numbers. This 
appears to be the same disease that attacks the apple-tree tent- 
caterpillar mentioned in Bulletin 152, page 291. 
o 
COMBATING THE INSECT. 
Owing principally to the fact that the caterpillars attack a large 
variety of trees, this subject is a somewhat complicated one. In 
badly infested localities, however, it has three distinct phases. 
First, combating the insect in the forest; second, combating the 
insect when attacking shade trees; and third, combating the 
insect in the orchard. We will discuss the subject under each of 
the three heads, reversing the order given above. 
Combating the msect wm the orchard; destroying the eggs.— 
After the leaves have dropped the egg masses are somewhat con- 
spicuous. When pruning the trees they should be carefully 

30 Insect Life, 3: 157. 
31 Insects Injurious to Fruits, p. 57. 
