88 ENTOMOLOGICAL NEWS [xxxii, '21 



Experiment D. 



Four larvae hatched on September 25 and were supplied with rose 

 mildew. On the 27th two of the larvae were offered Aspidiotus sp. from 

 Dracaena, the "armor" of the scales having been removed to enable the 

 Psylloborae to feed on the soft bodies of the scales. These two larvae 

 died respectively September 30 and October 1 without having attacked 

 any scales or visibly increased in size since September 27. The other 

 two were fed continuously on rose mildew and pupated October 14 



and 17. 



Experiment E. 



Two larvae in the third instar were collected on a mildewed rose- 

 bush, September 27, transferred to a vial and offered Aspidiotus sp., 

 the "armor" removed from the scales as in Experiment D. On October 

 2 one of them died, the other was alive and was offered rose mildew. 

 Neither larva showed visible increase in bulk and no scales had been 

 attacked. The survivor subsequently transformed normally. 



Experiment F. 



Seventeen larvae hatched September 3 and previous to the 6th were 

 fed rose mildew. On that day and thereafter two of the larvae were 

 offered aphids (Af. persicae). Both larvae died September 12. They 

 exhibited no visible increase in size since the 6th, and no aphids had 

 been attacked. The remaining larvae of the lot transformed normally 



on a mildew diet. 



Experiment G. 



Three larvae in the third instar were collected on a mildewed rose- 

 bush August 27, transferred to a vial and offered red spiders (Tetra- 

 nychus). All died on the 30th, showing no visible increase in bulk since 

 the 27th, although one molted on the 29th. A fourth larva collected 

 with them, fed on mildew, pupated September 2. 



From the foregoing experiments it appears that under lab-or- 

 atory conditions aphids, red spiders, black scale and "armored" 

 scales were refused by the larvae, the latter starving rather 

 than partake of such animal foods. 



Some similar experiments with the adult beetles had a 

 similar result. In these aphids and red spiders were offered 

 and in no case were eaten. The adult beetles are capable of 

 prolonging their life without food for long periods not only 

 during their hibernation but also in the period of activity in 

 the spring and summer months. 



The larvae of Psyllobora and Thca are said by Boving 3 to 



3 Boving, Adam. A Generic Synopsis of the Coccinellid Larvae in 

 the United States National Museum, with a Description of the Larva 

 of Hyperaspis binotata Say. Proc. U. S. Nat. Mus., vol. 51. Jan. 15, 

 1917. 



