Cyfiipidae with alternate generations. 95 



gall-flies, based on observations extending over many 

 years. The species described belong to the fauna of 

 this locality (Schleswig\ but at the same time they give 

 a tolerably accurate illustration of the oak gall-flies 

 occurring in the whole of North Germany. I have 

 not as yet been able to make any experiments on 

 the South German species, nor on those occurring 

 only on Qiiercus cerris. There still remains a wide 

 field for observation and discovery. 



In order to facilitate reference, I have arranged in 

 a tabular form those species of which the alternate 

 generation is known to exist ; and I have placed in 

 a separate table those which are found in one form only. 



/. Cynipidae with alternate generations. 



No. 



9- 



10. 

 II. 

 12. 



13- 



H- 

 15- 

 16. 



17- 



18. 

 19. 



Parthenogenetic Genera- 

 tion. 



Flies 

 Emerge. 



Sexual Generation. 



Flies 

 Emerge. 



Neuroicrus leniicidaris 



„ lacviusciiliis 



,, niiniisntatis 



„ ymnipeniiis 



Aphilotrix radicis . . 

 ,, Sieboldi . . 



,, corticis . . 



,, globuli . . 



„ col lay is . . 



,, fecimdatrix 



,, callidonia . 



,, Malpighii . 



,, aiiiuinnalis 



Dryophanta scutellaris . 

 „ longiventris 



,, divisa . . 



Biorhisa aptera . . . 

 ,, renutn . . . 



Neuroterus ostreus . . 



April 

 j March 

 ( April 

 April 

 May 

 f April 

 1 May 

 J April 

 1 May 

 j April 

 1 May 



April 



April 



April 



April 



April 



April 



Jan. 



Feb. 



Nov. 



(Oct. 

 1 Nov. 

 j Dec. 

 1 Jan. 

 ) Dec. 

 ") Jan. 

 ( Nov. 

 ( March 



li; 



Spathegaster baccariim 



,, alb i pes 



,, vesicatrix 



,, tricolor 



Andrictts iioduli . . 

 , , tesiaceipes 



,, {[emntatus 



iftjlator 



curvator 

 pilosiis . 

 cirratus 

 midtts . 

 ratnuli . 



Spathegaster Taschenbcrgi 

 ,, similis 



,, verrucosus 



Teras terminalis . . . 



Trtgonaspis crustalis . 



Spathegaster aprilinus 



June 



June 



June 

 July 



August 



August 



fjuly 

 \ August 

 ( June 

 ) July 



June 



June 



June 



June 



July 

 ) May 

 ) June 

 ( May 

 ( June 

 I May 

 I June 



July 



J May 

 ' June 

 J May 

 i June 



