64 



Heredity. 



carefully protected from the access of other insects until 

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

 mens of Spatliogaster baccarum were produced. The 

 sexes united 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 parthenogeuetic female 

 Neitroterus lenticular is. 



He has' made similar careful observations on many 

 other species, and he gives the following table to exhibit 

 his results: 



Parthenogenetive form bom from 

 a winter gall, and producing a 

 smnmer gall. 



JSeuroierus lenticularis. 



Neuroterus la^viusculus. 



Neuroterus neumismatis, 



Neurotcnis fumipennis. 



Aphilotrix radicis. 



Apliilotrix Sicboldi. 



Aphilotrix corticis. 



Apliiloliix globiili. 



Apliilotrix colluris. 



Apliilotrix fecnndatrix. 



Apliilotrix callidoma. 



A]")liilotrix Malpighii. 



Aphilotrix aulumnalis. 



Dryophanta scutellaris. 



Dr^'ophanta longiventris. 



Dryophanta divisa, 



Biorhiza aptera. 



Biorhiza renum. 



Neuroterus ostreiis. 



Sexual form bom from a summer 

 gall, and producing a winter 

 gall. 



iSpathogaster baccarum. 



Spatliogaster albipcs. 



Spalhogaster vcsicatrix. 



Spathogaster tricolor. 



Andriciis noduli. 



Andricus testaceipes. 



Andriciis gemmatus. 



Andricus inflator. 



Andricus currator. 



Andricus pilosus. 



Andricus cirratus. 



Andricus iiudus. 



Andricus ramuli. 



Spathogaster TaschenbergL 



Spathogaster similis. 



Spatliogaster verrucosus.^ 



Terus terminalis. 



Trigonaspis crustalis. 



Spathogaster aprilinus ? 



In the following four species no males were discovered, 

 but the parthenogeuetic females gave birth to females 

 like themselves: 



