EAST AFXaCAN IKSICCTS. 1017. 



22. Dacus rEcrOiuus Walk. (Tiypetidaj). l.iv. 22. On taking 

 "this fly, I went an' I captured examples of the models from close 

 by. This wonderful mimic is apparently commoner than the 

 model, but not so in reality I believe, the explanation being that 

 on entering the house it immediately flies to the gauze to escape, 

 while the vvas2)s, ktiowing their way about, make straight for 

 their nests. Accompanying (22) were two other somewhat smaller 

 but very similar species, together with the following. 



22 a. Dacus BHEVISTYLUS Bezzi. 21.iii. 22. A smaller species, 

 und possibly forming a protective association with (22). 



23. Oerceris sp., $ (Sphegidoe : Fossoria). l.v. 22. Not 

 so common as (20) or (21). The very similar Jcaria distiyma 

 Gerst. was also taken. 



24. Dacus sp. nr. lounsburyi Coq., $. 13. iv. 22. The only 

 specimen taken. 



25. Paniscus opaculus Thorns., very near the British testacous 

 Hohngr. (Ophionina3 : Ichneumonida;). 2. i. 22. A common ich- 

 neumon fly. 



26. A species of PiMrnNvE (Ichneumonidsc) not in Brit. Mus. 

 9.iv. 22. By no means abundant. 



27. Platyura sp. (MycetophilidjB). 11. v. 22. The only speci- 

 men of this Dipteron I have taken, though I have seen but no(j 

 captured others. 



28. A species of MiCROPEZiDiE (Diptera). 2. i. 22. Common. 



29. Plecticus elongatus F., 5 (Stratiomyidre). 2.i.22. Very 

 ■common. It will bo observed tliat the model (25) and Dipterous 

 mimics (28) and (29) were taken on the same day, and not onl}' so 

 but at the same time, on the samegauzed window within a radius 

 of two feet. I have subsequently seen the model and mimic 

 together on several occasions. 



29 «. Stylogaster sp. (Oonopidfe). 11. v. 22. Only a single 

 specimen taken of this very ichneumon-like Dipteron. 



30. PisoN sp., probably xanthopus BruUe (Sphegidte : Fossoria). 

 15. iv. 22. Common. 



31 . NoMiA sp., probabl)'^ same as unnamed species from Entebbe 

 in Brit. Mus. (AndrenidjE : Anthophila). 27.iii. 22. Common. 

 Another bee of the genus Hcdictus probably enters the same 

 association . 



32. Sargus sp. (Stratiomyidse) and 32 a. Probabl)'- Sargus sp. 

 20.iii.22 k 9.iv. 22. Dipterous mimics of (30) and (31); with 

 closed Avings they are very bee-like. 



33 and 33rt. Eumerus sp. (Syrphidoo). 3. i. 22 k, G. i. 22. Bee 

 mimics. (33«) has its wings set in the attitude of rest seen in 

 life. 



34. Number missing. A large example of No. 31 bears the 

 following date, but it is i-ather small as a model for (35). 24. i. 22. 

 Bee. . 



