species of imported North American Dryinidae did attack our 

 cane pest, and were reared on these in captivity, and their ofif- 

 spring Hberated in the cane-fields, l)ut neither of these has as 

 yet shown up at large. 



That -Air. Koebele's North American material has not been 

 done justice to from a purely scientific point of view is due to 

 the fact that the practical end in view, namely, to establish the 

 parasites, naturally outweighed the former. There are ten 

 North American species described or referred to in Pt. I of this 

 Bulletin, but the number really collected and sent by Mr. Koe- 

 bele was unquestionably considerably larger. With the excep- 

 tion of one or two species sent in great numbers l)y him, no 

 individuals were killed by me as specimens for study. Some 

 were turned loose in cane-fields, infested with leaf-hopper, and 

 some were ]jlace(l in large cages on growing cane plants simi- 

 larly afi^ected. The preserved material therefore chiefly con- 

 sists of specimens that died a natural death in these cages, and 

 which happened to be found subsequently, together with a few 

 examples that emerged and died on the way to the islands, and, 

 again, of a few examples collected and mounted l)y Koebele 

 himself in Ohio and California. 



From another point of view Air. Koebele's work in Ohio and 

 California was of great value, for it was extensive enough to 

 show what kind of natural enemies of leaf-hopper might be 

 looked for in other countries. In fact it was these prior inves- 

 tigations in North America that led him at once to investigate 

 the eggs of the cane leaf-hopper in Australia for internal para- 

 sites and to at once discover their presence on this investiga- 

 tion. 



MISSION OF KOEBELE AND PERKINS TO AUSTRALIA. 



We reached Sydney in Aiay, the weather being cold and on 

 our first arrival very wet, so that little entomological work was 

 done there. Air. Koebele, however, wished to visit some of the 

 orange orchards in the vicinity, with which he had become well 

 acquainted on some of his earlier missions. A number of spe- 

 cies of living ladybirds were accordingly collected and shipped 

 to Honolulu. Being too far south for cane, not much atten- 

 tion was paid to leaf-hoppers, but the presence of hymenop- 

 terous parasites was demonstrated by the discovery of Dryinid 

 sacs on the larvae of common Jassids. 



Early in June we arrived at Brisbane, and on the first cane 

 that we saw, a few plants in the ])ublic gardens, we at once ob- 



