230 ON THE LABIAL AND MAXILLARY PALPI IN DIPTEEA. 



Plate 8. 



Fig. 1. hahium oi Taba)ius{H(P7natopota pluvialis), lateral view. The remaining parts (the mandibles, 

 maxillae, max. palpi, labrum, and bypopharynx) have been removed. 



2. Head of Empis chioptera. 



3. Proboscis of EristaUs tenax, lateral view. 



4. „ CaUiphora erythrocephala, lateral view. 



5. Dissection of the maxilla aud palpus of Helophilus pendulus. 



6. „ „ „ Eristalis tenax. 



7. Dissection of the dorsal plate on the labium oi CalUphora erijthrocephala, showing the embedded 



mandibles. The lower end shows a portion of the pharynx, dorsal view. 



8. Labium of Dilophus albipennis , ventral view. 



9. Maxillary palpus of Mydea impuncta. Only the anterior end of the stipes is shown, with a 



lateral view. This applies to all the figures of palpi on these Plates. 



10. Maxillary palpus of Hyetodesia perdita. 



11. „ ,, Cyrtoneura stabulans. 



12. Rudiment of maxillary palpus, Musca domesiica. 



13. Maxillary palpus of Polietes lardaria. 



14. „ „ Ophyra leucosloina. 



15. „ „ Hydrotea dentipes. 



16. „ „ Hyetodesia lucorum. 



Plate 9. 



Fig. 17. Proboscis of Ophyra leucostoma, dorsal view. 



18. „ Balioptera combinata, lateral view. 



19. „ Nemopoda cylindrica, lateral view. 



20. „ Sphcerocera subsultans, dorsal view. 



31. „ a species of Ephydra {Hydrellia griseola, Fallen?). 



22. Maxilla of same, more highly magnified. 



23. Part of the labium of Culex pipiens, 2 , showing the labella, dorsal view. 



24. Dissection of the cardo, stipes, palpifer, and palpus of the maxilla of Culex pipiens, ? . 



25. Extremity of the labrum of Cnlex pipiens, S ■ This has affinities with the labrum in some 



species of the Syrphidte. 



26. Extremity of the labrum of C. pipiens, 2 , showing the higher organization of the female. 



27. Rudiment of maxillary palpus, Hylemyia cardui. 



28. „ „ „ Homalomyia canicularis. 



29. „ „ „ Pegomyia bicolor. 



30. End of stipes, Phito melanocephala. 



31. Rudiment of maxillary palpus, Graphomyia maculata. 



Plate 10. 



Diagram showing a speculative arrangement of genera and species, placed 

 as they recede from a hypothetical primitive form. 



