HYBKIDS — UY CROSSING T. UISTORTATA WITH T. CREPUSCULAUIA. '217 



Notes on Hybrids (2nd Crosses) obtained by crossing Teplirosia 

 bistortata with T. crepuscularia. 



By A. I3AC0T. 

 Bosidos the hybrids du.sci-ibud, ante, pp 192-191, I obtained tbc 

 foUowiiij,' cross-paidiigs of tbo bybfids tbouiselvcs : — 

 Rcf. No. Paired. j Parent ? Parent. Remit of cogn hatching. 



(A) June 8tli dclamerenMx X histortata x Most of ova hatched. 



hi.itortiita crcjiitxrularia 



(B) ,}mui tith-dlh delanieren'iisx bi.'^tortata x Ova given away. 



hi.ttortata delaiiiercnsis 



(C) June lOtb delameren.^i.'^x bistortata x Portion infertile. 



bistortata delaineren-fis 



(D) .June 10th bistortata x bistortata x Portion infertile. 



crepuscu la ria crepuscu la ria 



(E) .(uiii; 10th bistortata X bistortata x Ova ^'ivcn away. 



crepuscularia crepuscularia 



(F) June nth bistortata X bistortata x All fertile. 



crepuscularia delaiiierensis 



(G) June l".ith bistortata x bistortata x No ova laid. 



delameren.iis delanierensis 



(H) June llJth bistortata x bistortata x Ova mostly fertile. 



deUnnerensis delaincrensis 



(I) June 1-lth bistortata x bistortata x Ova mostly fertile. 



delainerensis crepuscuki ria 



(K) bistortatax bi.itortatax Nearly all fertile. 



crejnisrularia crepuscularia 



(X No. 01) June 15th delaiiierensis x bistortata Only one or two hatched. 



bistortata 



(L) June 17th bistortata x bistortata x Portion infertile. 



crepuscularia rrepufcularia 



(X No. 02) crepuscularia bistortata x Nearly all fertile. 



('2nd brood) delanteren?is 



(O) Aug. 3rd delamerensisx bistortatax No ova laid. 



bistortata crepuscularia 



(P) Aug. ()th delaniercnsisx 1/istortatax Ova given away. 



bistortata crepuscularia 



The broods marked A, H, I, K, L, X No. 02, produced larvie 

 which were successfully reared, and, in most cases, a large proportion 

 of moths emerged before the end of 1897. In the parentage of the 

 hybrids above the first name stands for the c? , and the second for the 

 female Thus, " dclameroisis x histortata" means that the male 

 parent of the hybrid was delanicrensis, and the female parent bistortata. 



To obtain the second crosses, the males and females which I 

 desired to pair were simply left together for a single night, and the 

 females boxed for ova the next morning ; in those cases, therefore, 

 where the wiiole batch of eggs proved infertile, it may be that copula- 

 tion did not take place at all. 



lNUKEf:DIN(} WITH PARENTS OV THE SAME HYUHIU STOCK. FoUr 



attempts [D, E, L* and K*] were made with j s and $ s of X No. la 

 {ante, p. 198), i.e., 3 bistortata x $ crepuscularia. All the females 

 laid eggs, and of the three batches which I kept, two were only 

 partiaHy fertile, and all, or nearly all, the eggs of the third batch 

 hatched. The ova of one brood were measured, and proved to be 

 rather smaller than the average of T. crepuscularia eggs, giving a 

 length of -025 and breadth of '015 of an inch. I lost one brood of 

 larvie during an absence from home, but a fair number of the 

 remaining broods [L and K] fed up and pupated. 



