LÉPIDOPTÉROLOGIE COMPARÉE 467 



Pœcilopsis hybrid hunii cf x Lycia hirtaria Q = (hybrid hullï). 



This Crossing is just as easy to obtain as the last, but it rarely 

 yields fertile ova, the first being obtained in the spring of the 

 présent year. Only a few hatched safely. When placed on their' 

 food plant {Cratcegus oxycanthd) the young larvae fed up quite 

 as rapidly as those of the previous hybrid and proved just as 

 healthy. 



As there is very little différence in any respect, between the 

 larvae or pupas of this form and the last, it is of little use repeating 

 the descriptions. 



îthysia hybr. harrïsoni cf x Lycia hirtaria Q = (hybr. goodwini). 



This Crossing is very easy to obtain and has been secured scores 

 of finies. The female hirtaria, however, rarely lay more than half 

 a dozen ova and then thèse are nearly always infertile. 



One oviun, deposited in April 19 10, hatched, but the larva died 

 at once. Ail attempts since then to repeat this success hâve been 

 useless. The larva was exactly the same as that of a normal 

 hirtaria. 



CONCLUDING REMARKS 



During the course of the above experiments, many interesting 

 facts were observed ; some of them were so important that spécial 

 attention is given to them hère. 



They are : 



1. The great constitutional strength of the larvae. 



2. The variation in sterility of the différent primary hybrids 

 reared. 



3. The apparent dominance of zonaria and grœcaria charac- 

 teristics in the products. 



