October, '15] CLAUSEX: aphid-feedixg coccixellid,e 489 



Ovrposinox Records 



Species 



No. of 

 Specimens 



Length 

 of 



Period, Days 



Per cent Days 

 Eggs 

 Deposited 



Average 



for 

 Period 



Average eggs 

 Per 

 Day 





10 



31.0 



69.0 



207 



8.0 





10 



29.2 



75.0 



249 



8.4 





11 



33.3 



63.8 



299 



8.9 





8 



48.1 



61.4 



312 



7.3 





9 



34.7 



70.3 



234 



6.3 





9 



35.4 



89.3 



347 



9.8 





10 



28.2 



69.4 



190 



6.7 





10 



28.8 



73.6 



201 



7.0 



Rate of Oviposition 



A very considerable difference was found to exist in the number of 

 eggs deposited by the various species. As would be expected from 

 field observations, H. convergens deposited the greatest number of eggs, 

 609 being secm^ed from a single female, while the average for all indi- 

 viduals was 299, but lea^dng out of account the three females which 

 died prematurel}^, the average for the species was 358 eggs. 0. oculata 

 was a very close second with 347, while A. hipimctata was least with a 

 production of 190 eggs. The maximum number of eggs deposited by 

 a single female in one day was 43 in the case of H. convergens, while 

 0. oculata was last with a maximum of 22 eggs. The latter species, 

 however, ranked first with respect to the daih' average for the entire 

 period with 9.8, while 0. abdominalis was last with 6.3 eggs per day. 



Frequexcy of Ovipositiox 



The proportion of days upon which eggs were deposited varies 

 greatly, the range being from 61.4 per cent for H. amhigua to 89.3 per 

 cent for 0. oculata. The latter species was found to be markedly 

 uniform in this respect, the range among the nine individuals of the 

 species being from 84.3 to 95.5 per cent, the minimum in this case being 

 higher than the maximum of any other species. It will be noticed, 

 however, that the regularity of oviposition was not in direct proportion 

 to the total production of eggs, inasmuch as H. amhigua, the lowest 

 with respect to the frequency of oviposition, ranked second in total 

 production. 



Life-History 



A greater or less uniformity exists among the various species as 

 regards the length of the different periods or stages of the life c^^cle. 

 The egg stage ranged in length from 4.2 days for 0. ahdominalis to 6.0 



4 



