572 Explanation of Plates. 



Fig. 14. Eximcnes dyschcra (^, Jan. 1900. 



15. Trochilium .«p. , Umtali, 3700 feet, Dec. 1900. 



16. „ „ ., „ „ 



17. Bombylius sp. nov., Feb. 1!)00. 



18. Silrius jm-tusHs, Nov. 1898. 



The two remaining figures illustrate tlie mimicry of a large 

 Asilid fly for a common type of African Xylocopid bee. 



19. Xylocopa fiavo-rnfa $,Oct. 1899. 



20. Hyperechia marshalli ^, Fel). 1899. Mimic of the above. 



Explanation of Plate XXIII. 



Mashoxaland Aculeates axd their ]\Iimics. 



All the figures are about y\ of the natural size. 



All the specimens were captured by Guy A. K. ^Marshall at Salis- 

 bury, Mashonaland, 5000 feet. 



Figs. 1 to 11 are a group of small insects with black head and 

 thorax and yellow or fulvous abdomen. 



Fig. 1. Elis aureola ?, April 1900. 



2. Philanthiis f}isci2:)cmiis 2 , Feb. 1900. 



3. „ diadcma $ , Oct. 1899. 



4. „ „ <?, Jan. 1900. 



5. „ hnccphalus ^,Ffth.l'i)QQ. 



6. lihynchvnn radialc '^ , Jan. 1899. 



7. „ rvlienn, ya,T. 9)Jfin. 1899. 



8. „ „ var. 9 , Feb. 1900. 



9. Sphecodes riifiventris $, April 1899. 



10. Chalcis hicolnr (^ , April 1900. 



11. Athalia bicolor, Jan. 1900. 



The two following figures represent outlying members of 

 the group represented in Figs. 14 to 19, the colour of the 

 head and thorax being of a darker tint. 



12. Xylocopa laferitia $, Jan. 1900. 



13. „ ^avo-r»/« ?, Oct. 1899. 



Figs. 14 to 19 are black, dark-winged insects with yellowish 

 head and thorax. 



14. l''odalirius acraimsis 9>^Ifiyl899. 



15. Anthophora bamlisl ?, Oct. 1899. 



16. Xylocoj)a olivacea 9 j June 1900. 



17. „ modesta 9 » u 



