the Two Genera Nusa and Pogonosoma. 207 



Legs blackish, tibiae and tarsi dull reddish 

 brown. Scutellum and black abdomen 

 with pale pubescence elva, <S , Wlk. 



Legs with distinctly yellow knees. Abdo- 

 men brownish, with lighter tomentose 



segmentatious formio, S ? , Wlk. 



3. Tibiae extensively yellowish at base. Abdo- 

 men blackish, with pale segmentations. 

 Moustache pale grisea, S $ > Hermann. 



Black species. Lega and moustache black. 

 Abdomen with four pale side-spots yerburyi, S ? > sp- Q- 



Legs black. Moustache pale. Abdomen 

 ashy white on the basal half albibasis, S , sp. n. 



Nusa cequnlis, ? , Walker. 



Ins. Saund., Dipt, part ii. p. 105, pi. iv. fig. 4 (1851) ; List Dipt. Brit. 

 Mus. Tii., Suppl. 3, p. 564 (1855). 



Type (female in poor preserv9,tion) from East India. 

 Type of the genus. 



It may be distinguished from Nusa formio, Wlk., by the 

 absence o£ any reddish-yellow or honey-yellow colour on the 

 legs. Tiie third joint of the antennce is somewhat longer, 

 the moustache pale yellow. Abdomen black, with white 

 tomentose spots at sides, not covered apparently with tawny 

 pubescence and tomentum as in the above-mentioned species. 

 In both these species the third joint of the antennae is chiefly 

 reddish or tawny. 



Nusa elvttf Walker. 



List Dipt. Brit. Mus. ii. p. 445 [Asihts] (1849) ; id. vii., Suppl. 3, 

 p. 553 (1855). 



Type (male) from North Bengal (Miss Campbell's Coll.). 



This small species was described under Asilus by Walker, 

 who apparently overlooked the peculiar venation and other 

 particulars ; neither does he mention the sex. This species 

 has a general resemblance to some of the African species, 

 and has, like them, the short third joint of antennas. 



A black species, with distinct ashy-grey segmentations on 

 the abdomen, and the scutellum is covered with the same 

 coloured tomentum. 



Length 15 mm. 



Male. — F'ace covered with ashy-grey tomentum. Moustache 

 composed of numerous strong black bristles and a few short 

 white hairs at sides. Antennce with the two first joints largely 

 awny and with black bristles ; these latter are very strong 

 A\ the back of the head. Thorax blackish, with grey 

 tomentum at sides and on shoulders, the pubescence black. 



