248 Variation in the Mealivorm, Tenebrio molitor 



5. Sterile Eggs. 



We had already observed a few times that isolated, virgin females 

 occasionally deposit eggs, which fact suggested the possibility of parthe- 

 nogenesis, of which but few instances are recorded in Coleoptera. In a 

 series of ten dishes we put a number of females (mostly 25 in each dish), 

 and kept these for 25 days. 248 beetles in total were isolated, from 



Number of beetles. 



35 25 25 25 



Kggs obtained from 



Date No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 No. 7 No. 8 No. 9 No. 10 



14 April 1916 i_ — _ — __ _ — _ 



16 'i_____.____ 



17 2 — — — — — — — — — 



19 72 — — — — — — — — 



22 2 — —— — — — — — — 



23 3____._____ 



24 3i________ 



25 5i________ 



26 14 3________ 



27 2— 52 — — — — — — 



28 433i______ 



29 i._ 5 !______ 



30 3_ii__ — ___ 



1 May 2—21 i _ _ _ _ _ 



2 1 !________ 



3 iiii______ 



4 4 l__ !_____ 



5 — 2 2 — — 1 3 — — — 



6 __4_i_____ 

 8 __8 2 — — 2 — — — 



10 __ii______ 



11 __55i3i___ 



12 __i3i4— 1 — — 



13 __ 8 2— 2— 2 — — 



15 __21— 2— 4 — — 



17 _____283 — — 



18 _____5___2 — 



19 _____2 2 11 — 



20 _____i_i__ 



22 _____ — 4 4 — — — 



24 ______3 — — — 



27 ________!_ 



3 June — — — — — — — — 16 — 



8 _________4 



9 _________! 



10 _________2 



26 __________ 12 



1 July _________ 9 



Total Eggs 56 15 48 21 10 21 



23 



12 



20 28 



