232 Variation in the Mealworm, Tenebrio molitor 



grooves. This strange anomaly also did not reappear even in the F2 

 generation. So the result has been negative as regards the heredity of 

 segment-anomalies. 



FiK. 3. 



SVotdoxox 



Fig. 4. 



c. Variation of the Number of Spines on the Last Segment. 



The larva of T. molitor carries at the end of the last (13th) segment 

 two black-brown chitinous spines, which distally slightly diverge. To the 

 right and left (laterally and a little proximally to the base of these spines) 

 may be found still on the same segment, two dark points, which, when 

 observed under a more powerful lens, also appear to be spines but only 

 in a rudimentary state. 



