PRODUCTION OF NEW SPECIES. 



289 



nor was there any conscious selection practiced. Free interbreeding in each 

 lot was allowed. The general result is expressed in text-figure 26. 



This race with a cycle of five generations is of great interest, showing the 

 profound modification resulting in the reproductive cycle. None of the 



.GENERATIONS , 



I 



II 



III 



IV 

 V 



VI 



VII 



VIII 



IX 



X 



XI 



XII 



XIII 



XIV 



XV 



XVI 



XVII 



XVIII 



DECEMLINEATA 

 10 <? X 109 



1 

 DECEMLINEATA 

 84?, , 92$ 



DECEMLINEATA 



98?. 1049 



7c? X 7 



*B 



DECEMLINEATA 

 60?, j 63 9 



DECEMLINEATA 



(Parent stock Chicago, III.) 



(Normal) 



( Normal) 



(after hibernation, subjected to conditions of experiment described.) 



DECEMLINEATA 



12<?> J 89 



DECEMLINEATA 



18 <?, 22 9 



17 r?, 20 9> C<?> 2 9 ;Emer s e(1 ,rom *Btivation Jan. 2nd. 



DECEMLINEATA 

 12c?, 149 



DECEMLINEATA 



3cT, t 79 



DECEMLINEATA 



15?, , 219 



DECEMLINEATA 

 26 ?, I 329 



DECEMLINEATA 

 40 ?, | 38 9 



DECEMLINEATA 

 12?, I 119 



DECEMLINEATA 

 10 (J, | 99 



DECEMLINEATA 

 17c?, , 179 



DECEMLINEATA 

 26<?. I 439 



DECEMLINEATA 

 19?, I 219 



DECEMLINEATA 

 48?, , 479 J 



DECEMLINEATA 

 38,?, | 429 



DECEMLINEATA 

 40?, J 359 



DECEMLINEATA 

 18?, 32 9 J 



Five successive geue- 

 rations of L. decern- 

 liueuta normal in ev- 

 ery respect excepting 

 'the number of gene- 

 rations iu each cycle. 



Second cycle 



Test-figure 26. 



beetles of the lineata group, to which this beetle belongs, have more than two, 

 or rarely three, generations per year, and there are none known in the genus 

 that have over three. Clearly, then, this race with five generations in each 

 cycle is quite a new character in the genus, and was, as far as discovered, 



