194 Heredity and Eiiii^ciiies 



females of L. dcccDiUiicala, from tlie txpical stock at Chicago, 

 iwo males and two females of L. obloiv^ata, and two males 

 and two females of L. muUiiacniata were mated in the early 

 part of June. This culture was confined in a cage 6 ft. 

 sc^uare on the ground and ,^ ft. high, cox'ered with wire 

 eighteen meshes to the inch, thus eliminating all selection 

 b)' insectivorous enemies. S. rostratitiii was supplied 

 as food in sufticient ciuantity. During June and July 

 these reproduced abundantly and gave a large progeny 

 which emerged late in Jul}- and early in August. In this 

 first hybrid generation at Tucson there was, as in the other 

 cultures, a blending of the materials introduced into the 

 experiment, but in this culture L. dccei)iliiicata was the 

 dominant member of the cross, although not completely. 

 In the larvae six t}ioes were observed: 



1. Those which on inspection appeared to be L. decem- 

 lincata. 



2. Those which were L. oblongata. 



3. Those which were L. multitaeiiiata. 



4. Those which were intermediate between L. dccem- 

 liiicata and L. multitaeniata. 



5. Those which were intermediate between L. dcccm- 

 liiicata and L. oblongata. 



6. Those intermediate between L. oblongata and L. 

 multitaeniata. 



It was, of course, impossible to tell on inspection what 

 the constitution of each of these types was. Five classes 

 of adults were recognized: 



A) Those which were clearly either pure, or dominants 

 of the L. oblongata type. 



B) Those which were clearly intermediate hybrids be- 

 tween L. dccemlijicata and L. oblongata. 



