KEAKINGS AND DISSECTIONS OF TACHlNIDiE. 



113 



not only that their Avits had been sharpened for webworms but that 

 they would find plenty of these on which to oviposit. 



Similarly, the second lot of flies of Japanese Tachina^ which had 

 been trained to oviposition on chrysorrhma entirely, was furnished at 

 the time of liberation with a good supply of native cold-storage chrys- 

 orr/iO'a caterpillars of fair size, placed on new and tender oak growth, 

 the tin'ysorrho'a of the vicinity being little more than hatched 



Fig. 28. — Outdoor cage for securing ovipoM i ion ^i laii 

 with paper to prevent the flies from congregating 



hi ml, covered aljout door 

 •oint. (Original.) 



at the time and too small to furnish it with proper host material. 

 Some of these caterpillars were dissected about a week later and 20 

 per cent of them showed living maggots of TacMna. 



IMPROVEMENTS IN THE OUTDOOR REARING CAGE. 



Experience with the outdoor cage described on page 96 has sug- 

 gested two improvements, which will be put into practice the coming 

 season. It is often highly desirable to be able to admit all the sun- 

 light and warmth available in the Massachusetts climate. For this 



