"" !N"ew York Agricultural Experiment Station. 309 



evidently a scavenger. Both species were kindly identified by 

 Mr. D. W. Coquillett. 



The second group, the hymenopterous parasites, are probablj 

 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 Ores., by Wm. Saunders.^^ From the 2,500 cocoons kept 

 by the writer in the laboratory 287 individuals of the species 

 Pimpla conquisitor were reared, of which 218 were females, leav- 

 ing 69 males; Pimpla pedalis, two females and one male ; llieronia 

 fulvescens, one male. The following species kindly identified by 

 Mr. Wm. H. Ashmead, assistant curator of the U. S. National 

 Museiun, were also reared from these cocoons: Diglochis 

 (Phromalus) omnivorous Walk. ; Miotiopis clisicampae Ashm. 

 As shown on page 304 but 312 or only about 12^ 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. 



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 insect in 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. 



