64 



Heredity. 



carefully protected from the access of other insects until 

 about the middle of June, when male and female speci- 

 mens of Spathogaster baccarum were produced. The 

 sexes uni-ted at once, and the females were then isolated 

 and placed in captivity, each with its little oak tree. 

 They soon laid their eggs in the leaf buds, and thus 

 gave rise to the winter galls, which, in the following 

 spring, produced a brood of the parthenogenetic female 

 Neuroterus lenticular is. 



He has made similar careful observations on many 

 other species, and he gives the following table to exhibit 

 his results: 



Parthenoger.etive form born from 

 a winter gall, and producing a 

 summer gall. 



Neuroterus lenticularis. 



Neuroterus Iseviusculus. 



Neuroterus neumismatis. 



Neuroterus fumipennis. 



Aphil-otrix radicis. 



Aphilotrix Sieboldi. 



Aphilotrix corticis. 



Aphilotrix globuli. 



Aphilotrix collaris. 



Aphilotrix fecundatrix. 



Aphilotrix callidoma. 



Aphilotrix Malpighii. 



Aphilotrix autumn alis. 



Dryophanta scutellaris. 



Dryophanta longiventris. 



Dryophanta divisa. 



Biorhiza aptera. 



Biorhiza renum. 



Neuroterus ostreus. 



Sexual form born from a summer 

 gall, and producing a winter 

 gall. 



Spathogaster baccarum. 



Spathogaster albipes. 



Spathogaster vesicatrix. 



Spathogaster tricolor. 



Andricus noduli. 



Andricus testaceipes. 



Andricus gemmatus. 



Andricus inflator. 



Andricus currator. 



Andricus pilosus. 



Andricus cirratus. 



Andricus uudus. 



Andricus ramuli. 



Spathogaster Taschenbergi. 



Spathogaster similis. 



Spathogaster verrucosus. 



Terus terminalis. 



Trigouaspis crustalis. 



Spathogaster aprilinus ? 



In the following four species no males were discovered, 

 but the parthenogenetic females gave birth to females 

 like themselves: 



