27 



species of insects. The ladybirds in both adult and larval stages fed 

 greedily on the eggs of the plant-lice and the young lice as soon as they 

 hatched. Accompanying the beetles was also noted several specie- of 

 predaceous bugs, the most common one being Podi&us serieventris. 

 Although this species was occasionally found feeding on the plant-lice, 

 it was continually observed preying upon the ladybirds in all their 

 stages. The particular species upon which it was taken in the act of 

 feeding were Adalia bipunctata in the egg, larval, and adult stages; 

 Cocdnella trifasciata, and Ohilocorus Mvulnerus. Four specimen- of 

 Podims serievmtris were once observed feeding on a single adult Adalia 

 Mpimctata. 



It is a well-known fact that many species of insects will become can- 

 nibals if kept in confinement with insufficient food, but Adalia bipunc- 

 tata has been observed repeatedly in the woods feeding upon the eggs 

 of its own species when plenty of other food was available and within 

 easy reach. 



By the last part of July scarcely a plant-louse or a ladybird could 

 be found in the locality where they had both been so abundant. 



Several species of Coccinellida? were bred in confinement, and the 

 following table gives their egg-laying records. A pair of beetles was 

 placed in each jar with food, and the record was continued until the 

 female died: 



Egg-layiug records of several species of ladybirds. 



[The asterisk (*) indicates the date on which the experiment was begun.] 



Date. 



Adalia bipunc- A.bipunctata. 

 tata. var. humeralis. 



Cocci- Cocci- Cocci- 

 Anatis 15-punctata. nella san- nella 9- nella tri- 

 guinea. notata. fasciata. 



April 6 



8 



* 

 9' 













* 

 29 

 15 

 29 

 27 















11 

















13 



* 











17 





* 







* 



18 













19 



9 













20 



11 











22 









13 



20 







23 



8' 



2 



8. 









2-1 









28 









9 

 9 







May l 



13 









" V " ' 



14 



* 

 12 

 17 





6 









* 



8 













- 





9 







15 











10 











t; 



!:. 







11 







12 







* 





12 







13 

 20 







12 



211 



17 



9 



24 



13 









('» 



5 







11 









12 



16 







(5 



21 

 IS 









is 











26 



27 

 1 

 5 

 8 



4 



1 

 10 



:::::::::::::::::::::: 



20 



19 





11 







9 



20 





14 





21 







S 

 2 

 1 

 7 







is 



22 















23 













12 



24 







* 

 10 



19 













27 

















28 



















29 













3 









30 









2:? 









June 2 









38 















