420 Mr. J. R. Mallocli on Exotic Mascaridge. 



been forced to admit a large number of species from the 

 African and Oriental regions Avhich have always more than 

 two strong postsutural dorso-centrals behind the suture. 



Tlie presence of hairs on the sides of the prosternum and 

 on the pteropleura, some weak setulae on base of third wing- 

 vein on lower surface, and the forward curvature of the 

 fourth vein ai)ically distinguish the genus from its allies. 

 The hind tibia has no calcar, but there are at times some 

 short setulse on the postero-dorsal surface. The hypopleura 

 is either bare or there are some hairs near the lower posterior 

 angle, and in a few cases there aie some very short hairs on 

 the latero-postenor declivous portion of the mesonotum in 

 front of scutellum. 



Dichaetomyia polita, Malloch. 



This species varies very strikingly in colour sometimes, 

 being at times almost entirely glossy black, and in several 

 examples before uie yellowish testaceous with a distinctly 

 vittate thorax and the apical half of abdomen blackened. 



I have before me a good series taken at Obuasi, Ashanti 

 {Br. W. M. Graham). 



Dichcetomyia blfasciata (Stein). 



Like all the species except the genotype this one was 

 originally placed in Mydcea by its describer. 



1 have before me a male of this species which bears the 

 written label '■^ Ariaa bivittata, Walker, MS.,^" and another 

 label, presumably in the handwriting of AYalker, Mith the 

 name " bivittata." 



Locality, New Guinea. 



Dichatomyia tiiveipalpis (Stein). 



A very distinct species, which is readily recognized, at 

 least in the female, by the large, flattened, whitish palpi. 

 The species has somewhat similar coloration to bifasciata, 

 tlie thorax being brown vittate, but the abdomen is largely 

 blackened on dorsum. 



One specimen from Talum, Siam {H. C. Robinson and 

 N, Annandule). 



Dichcetomyia fasciculi(/era (Stein). 



I have before me four specimens from the Seychelles 

 Islands, Sans Souci, 2. ii. 190G {P. li. Dupont). 



