Explanation of Plates. 573 



Fig. 18. Elis csdehs ? , Dec. le/.lOOO. 



19. Melitlia sp. „ „ Mimic of tlie above. 



Figs. 20 to 29 and 31 are insects with dark-blue or blackish 

 wings and yellow heads. Where the anterior yellow is 

 most developed (as in Fig. 25) the group merges into the 

 preceding one ; where it is least, the convergence is 

 towards the blue-winged group shown on Plates XX 

 and XXI. 



20. Pompilus marshalli ? , Oct. 1899. 



21. ,, dichmiis (^, Jan. 1900. 



22. „ „ ? , Oct. 1899. 



23. „ lascivus 5, June 1900. 



24. ,, anticus $ , Jan. 1900. 



25. Salins tamisieri $, Feb. 1899. 



26. Tachysphex Jluchmtus 5 5 J^^"^ 1900. 



27. Bromophila caffra,T>^c. 1899. 



28. Jonthodes scnlptilis, Nov. 1898 to Jan. 1899. 



29. Metica rufa S, Nov. 1898 to Jan. 1899. 



Figs. 30, 32, and 33 are blue- or black-winged insects with 

 yellow-banded legs which are very conspicuous during 

 hight. 



30. Litopus dispar, Feb. 1899. 



31. Iphiaidax ruber ^, Oct. 1900. 



32. Osprynchotus flavipes 5 , Jan. 1900. 



33. Pirates xneicollis, Dec. 1900. 



Figs. 34 to 36 are bhxck insects with narrow yellow bands 

 and clear wings. 



34. Pompilus fedivus 5, Jan. 1899. 



35. Myzine capitata $ „ „ 



36. Metopius discolor ^ „ „ 



Two flies with their model a Megachile bee. 



37. Megachile ap if ormis ^, Jan. 1899. 



38. Eumerus sp. nov. 1 „ „ 



39. Laxenecera mollis, Mar. 1900. 



The following figures represent a Syrphid fly which closely 

 mimics a common social wasp. 



40. Polistes marginal is ^ , Dec. 1898. 



41. Ceria ga^nhiana „ „ 



