On the Parasitism o/*Rhipiphorus paradoxus. 191 



II. Microporeuta. 



Stomach-wallwith sim- 

 ple cutaneous pores 

 (interstices in the 

 parenchyma), with- 

 out jDarietal canals. 



III. Orthoporeuta. 



Stomach- wall witli 

 straight, regular, ra- 

 dial parietal canals. 



( One person with one mouth-open-: 

 ing 



( Persons developed, 

 all with mouth- 



A stock with 

 many 

 mouth- 

 openings. 



openings 



Persons rudimen- 

 tary, many with- 

 out mouth-open- 



2. Olynthida. 

 5. Soleniscida. 



A stock with one mouth-opening 

 A person without mouth-opening 

 A stock without mouth-opening... 

 A stock compo.sed of persons and 

 1^ stocks of diverse genera 



f One person with one mouth-open 



in or 



6. Tarromida. 



9. Nardojjsida. 

 1 1 . Clisfolj/ntkida. 

 14. Si/corrk'izida. 



17. Thecometrida. 



ing 3. Sycarida. 



A stock with many mouth-open- 

 ings 



A person without a mouth-opening 



A stock without mouth-openings . 



A stotik composed of persons and 

 stocks of different genera 



IV. Cladoporeuta. 



Stomach -wall with 

 crooked, irregular, 

 branched parietal 

 canals. 



' One person with one mouth-open- 

 ing • 



A stock with many mouth-open- 



^ ings 



j A stock with one mouth-opening . 



One person without mouth-open- 



I ing 



i^ A stock without mouth-openings 



7. Si/codendrida. 



12. Sycocystida. 



15. Sycopkyllida. 



18. Sycomefrida. 



4. Dyssycida. 



8. Sycofhamnida. 

 10. Coenostomida. 



13. Liposfomida. 



16. Sycolepida. 



XIX. — On tJie Parasitism q/ E,hipiphorus paradoxus. 

 By T. Algernon Chapman, M.D. 



I HAVE read Mr. Murray's papers on the economy of Rliipi- 

 phorus with much interest ; and although he has not succeeded 

 in converting me to his views of its life-history, he has added 

 to our knowledge of its habits and raised anew an interest in 

 the relations subsisting between the wasps and their parasites 

 which will probably lead to observations in the coming season 

 that will set at rest many of the points in dispute. 



In the meantime I think it very desirable to form as correct 

 an hypothesis of the life of Bhipiphoriis as our facts admit of, 

 since an approximation to the truth is a most valuable guide 

 in making further investigations, while, on the contrary, an 

 erroneous theory may blind us to very obvious truths. 



I cannot better begin the remarks I desire to make than by 

 rendering what appears to me to be but justice to the accuracy 

 of the earliest record we have of the economy of BJupi'phorifSj 

 meagre and deficient in detail though this record is. The ob- 

 servations of Mr.Denison, brought to our notice by Mr. Smith 

 from the papers of the Ashmolean Society, appear to me to 



