464 



Bulletin No. 116. 



[Augwst, 



scattered through the open fields, at a distance from the food plants 

 of the beetles, the ratio of males to females was precisely twice as 

 great during the last half of the period as during the first. Slinger- 

 land's data, already referred to, do not support the supposition of 

 a relatively early death of the males. It seems likely, consequently, 

 that females may require repeated fertilization, especially as the 

 eggs' are laid gradually, a few at a time. 



Collections of Lachnosterna from Trees, Urbana, 1906. 



May 14 



May IS. . . . 



May 16 



May 17.... 

 May 21. . . . 

 May 22 . . . 

 May 23. . . . 



May 24 



May 25. . . . 

 May 26. . . . 



May 30 



May 31..:. 



June 1 



June 2 



June" 4. . . . 

 June S. . . . 

 June 6. . . . 



June 7 



June 9 



June IS. . . . 



June 16 



June 18 . . . 



June 21 



June 22 



June 25 



June 28 



Totals 

 Males . . . 

 Females. 



Implicita FDSca Gibbosa Rn^nsa Ilicis Hirticala Inversa Tristis 



59 



74 



27 



109 



24 



19 



193 



25 



31 



104 



4 



SO 



24 



45 



14 



6 



4 



1 



5 



4 



12 



90 

 95 

 52 



200 

 23 

 25 



239 

 26 

 35 



135 

 25 



108 



125 



129 

 96 

 54 

 36 

 9 

 41 

 27 

 17 

 76 

 16 



. 3 



834 



1683, 



17 



79 



10 

 8 

 2 



4 



17 



15 

 20 



1 



3 



4 



14 



7 



13 



13 



7 



3 



1 



66 



23 



134 



1 

 2 

 3 



5 



13 



6 



28 



4 



8 



19 



24 



12 



12 



15 



21 



4 



16 



1 



1 



9 



5 



24 



3 



8 



14 



24 



3 



5 



8 



39 



1 



14 



2 



3 



1 



45 



12 



12 



5 



12 



6 



7 



6 



8 



1 



2 



196 



145 



136 



106 



14 



11 



