572 Explanation of Plates. 



Fig. 14. Eumenes (lyncher a (^, Jan. 1900. 



15. TrocMlium sp. , Umtali, 3700 feet, Dec. 1900. 



Id. ,, « ,1 )» r 



17. Bomhylius sp. nov., Feb. 1900. 



18. Silvnis pertvsns, Nov. 1898. 



The two remaining figures illustrate the mimicry of a large 

 Asilid fly for a common tyjie of African Xylocopid bee. 



19. Xylocopaflavo-rufa 9, Oct. 1899. 



20. Hyperechia marslvxlU $, Feb. 1899. Mimic of the above. 



Explanation of Plate XXIII. 



Mashonaland Aculeates and their Mimics. 



All the figures are about -^-^ 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. £'Z)3oi(reo?r< ?, April 1900. 



2. Philanthus fnscipennis $ , Feb. 1900. 



3. „ fh'adema $ , Oct. 1899. 



4. „ „ (^, Jan. 1900. 



5. „ hHce})halvs (^, Feb. 1900. 



6. lihynrkinm radiale 9, Jan. 1899, 



7. „ riihens, var. 5 > ^^^- 1899. 



8. „ „ var. 9 , Feb. 1900. 



9. Sphecodes rnfiventris 5 , April 1899. 



10. Chalcis hicolor ^, April 1900. 



11. Athalia hicolor, 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 lateritia $ , Jan. 1900. 



13. „ /aro-r)'/a 9, Oct. 1899. 



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

 head and thorax. 



14. Podalirius acraensis 9 , May 1899. 



15. Anthopliora bamlisi ?, Oct. 1899. 



16. Xylocopa olivacea 9) June 1900. 



17. „ modesta 9 ?> 7? 



