XXXli, '21] ENTOMOLOGICAL NEWS 



mildew for food. In no instance was cannibalism displayed by 

 either adults or larvae. 



Experiments with Animal food. 



Since this coccinellid has been reported as feeding on cer- 

 tain animal forms (red spiders, aphids, scales) the writer 

 made- a series of experiments to determine whether larvae 

 under laboratory conditions would thrive on such food. 



Experiment A. 



Two Psyllobora larvae hatched July 19. Until the 23rd they were 

 fed on mildew ; on that date and up to the 28th they were offered walnut 

 aphids (Chromaphis juglandicola Kaltenbach). On the 25th, two aphids 

 appeared attacked hut otherwise no aphids were injured. July 28th 

 both larvae were alive, having molted on the 25th, and another species 

 of aphidid (Macrosiphum sp.) was substituted for the walnut aphid. 

 July 29 one of the Psyllobora died, having exhibited no visible increase 

 in bulk since the 23rd ; the other was alive and was offered Macro- 

 siphum rosac Linne. The following day the surviving beetle larva not 

 having attacked the aphids was returned to a mildew diet, but it died 

 August 3 without having shown visible increase in bulk since July 23. 

 Contemporaneous beetle larvae were completing their cycle in 11 days. 



Experiment B. 



Five larvae hatched September 5 ; at once two were offered rose 

 mildew, and 3 provided with Aphis gossypii Glover (instars ii-v). Two 

 days later one of the latter group died and the following day both the 

 survivors died ; no aphids had been attacked, nor did the larvae show 

 visible growth. Both the larvae fed on mildew cast the third molt 

 September 16; one of these was cast out, but the other pupated on the 

 22nd, the imago subsequently emerging October 1. This beetle was 

 offered walnut aphids from October 2 to 8, but refused them. 



Experiment C. 



Kight larvae hatched September 16; all were fed on mildew until the 

 20th, when two were offered red spiders (Tetranychus sp.). These two 

 larvae died on the 26th without having visibly grown, and having been 

 daily offered Tctranychus. September 21 three other larvae were 

 offered young black scales (Saissctia oleae). On the 23rd one was 

 returned to a mildew diet and subsequently pupated October 2. Sep- 

 tember 25 the two remaining not having exhibited any visible growth 

 and not having attacked any scales were offered Aphis gossypii. They 

 refused the aphids and died subsequently without exhibiting visible in- 

 crease in bulk. The three remaining larvae of the lot were fed on rose 

 mildew throughout the larval period and pupated October 2 to 4. 



