Biological Notes ou the Heinipterou 

 PTILOCERUS OCHRACEUS 



BY 



EDW. JACOBSON. 



The very curious species of Holoptilinae, which Mr. G. W. 

 Kirkaldy has identified as Ptilocerus ochraceus Montai: don, and 

 which he was so kind as to describe and figure in the preceding 

 paper, was found by me at Wonosobo, a place in the Kedou 

 Residency (Central Java), situated at a height of about 2600 

 feet. In the vicinity is a natural spring, used as a bathing 

 place, called Mangli. 



In the bamboo sheds surrounding the basin 1 discovered 

 large numbers of the curious bug. A few of them were flying 

 about, but the majority was to be found in the open ends of 

 the bamboo poles of which the roof was constructed, and on 

 the top of all the wooden posts supporting the structure. 

 Hundreds of the full grown insects as well as their nymphs 

 were crowded together in certain places. They were attended 

 by large numbers of small black ants, which Professor A. 

 Forel had the kindness to determine as Dolichoderus bitiiber- 

 culatus Mayr, one of the most common species in this country. 

 These ants usually make their nests in trees where they fasten 

 together two leaves, between which they store the larvae and 



