520 Transactions South African Philosophical Society, [vol. xiii. 



greyish -white squamiform hairs, and a cretaceous band of scales 

 along the lateral and posterior margins ; pygidium broadly and 

 bluntly conical in the centre and having on this projection two 

 cretaceous squamose patches ; abdominal segments, pectus and 

 hind legs fringed or clothed with greyish-white, sub-squamose 

 hairs ; anterior tibiae very bluntly bi-dentate in the male, bluntly 

 rounded and sub-truncate at apex in the female. 



This species is myrmecobious, and was found by Mr. G. A. K. 

 Marshall entering the formicarium of Plagiolcpis custodiens, Sm. 



Length 71-8 mm. ; width 3^-31 mm. 



Hab. Southern Ehodesia (Salisbury, Sebakwe). 



Plagiochilus setosus, Burm., 



Handb. d. Entomol., v., p. 564 ; 



Westw., Thesaur. Entomol., p. 43, pi. xii., fig. 8. 



argenteus, Wasm., Illustr. Zeitschr. Ent., v., 1900, p. 103. 



Black, moderately shiny ; clothed on the upper side with flavesuent 

 whitish silky hairs; antennal club and palpi testaceous; ligular part 

 bulging in the outer face, slightly sinuate in front ; head and clypeus 

 very deeply punctate, and clothed with a long appressed pubescence ; 

 the latter is very slightly sinuate in front, with the margin reflexed ; 

 prothorax ampliate rounded at about the median part, and slightly 

 sinuate beyond, strongly reticulate, and without any dorsal impres- 

 sion ; scutellum strigillate ; elytra with the suture and one dorsal 

 costa on each side plainly raised, the humeral costule is somewhat 

 distinct, between the suture and the dorsal costa are two geminate 

 striae, but the suture and the remainder of the surface are roughly 

 reticulate punctate, there are rows of shoi't, upright hairs which are 

 denser and appressed along the lateral margins ; pygidium some- 

 what slanting, very convex towards the apex and densely pubescent 

 there ; under side pubescent ; anterior claws somewhat long. 



Length 8£- 9 mm. ; width 3^-3£ mm. 



This species, according to Mr. G. A. K. Marshall, is myrmecobious, 

 and found with Plagiolcpis custodiens, Sm. It flies in sunshine, and 

 feeds on flowers of Protect at Salisbury ; my examples from Natal and 

 the Limpopo River were caught on flowers. Westwood states 

 that Herr Guienzius found it in ants' nests, the individuals being 

 covered with the ants, which seemed to suck from them a gummy 

 exudation. 



Hab. Natal (Maritzburg) ; Transvaal (Upper Limpopo Eiver) ; 

 Southern Ehodesia (Salisbury). 



