338 Mr. E. E. Austen on new 



Up to the present time the species belonging to this new 

 genus, which is sufficiently characterized in the foregoing 

 diagnosis, have been met with only in South Central Africa. 

 In addition to the typical species, Pangonia compacta cen- 

 tralis, Austen (Ann. & Mag. Nat. Hist. loc. cit. p. 214 : — 

 Nyasaland Protectorate), and P. fodiens, Austen {ibid. 

 p. 215: — Nyasaland Protectorate), also belong to Dorca- 

 loemus. 



From the South-American genus Scione, Walk., in which 

 the fourth posterior cell is likewise closed, Dorcalcemus is 

 distinguished by its species having bare eyes and a very 

 different fades. 



Dorcalcemus bicolor, sp. n. 



<^. — Length (1 specimen) 13*5 mm.; width of head 

 4*25 mm. ; distance from upper margin of occiput to anterior 

 extremity of face 3'25 mm. ; length of proboscis 5'2 mm. ; 

 greatest width of abdomen (base of second segment) 5 mm. ; 

 length of wing 9 6 mm. ; greatest width of wing 3*6 mm. 



A slenderly built species, with (at least in the <$ ) relatively 

 narrow tapering abdomen. — Face short, but little prominent, 

 yellowish -white pollinose, lower part of sides clove-brown* ; 

 thorax olive, yellowish pollinose ; first three segments of abdo- 

 men buff on dorsum, cream-coloured beloiv, remainder of abdo- 

 men clove-brown, on dorsal surface an area on first segment 

 immediately beneath scutellum and a median basal spot on 

 second segment also clove-brown ; wings with a light sepia 

 tinge ; femora, except extreme tips, clove-brown or black, tibice, 

 tarsi, and extreme tips of femora cream-buff, last two joints of 

 all tarsi and tips of remaining tarsal joints brown or brownish. 



Head : upper part of sides of face and basi-occipital region 

 clothed with pale yellowish hair ; palpi clove-brown, terminal 

 joint curved and very slender ; 2 }r oboscis black ; first and 

 second joints of antennce clothed with black hairs, first joint 

 blackish, grey pollinose, second joint buff, third joint ochra- 

 ceous-rufous, somewhat brownish at tip. Thorax : dorsum, 

 including scutellum, clothed with bright Naples-yellow hair, 

 mixed with dark brown hair, especially on anterior portion 

 of dorsum and on hind margin of scutellum ; pollinose 

 covering on sides of dorsum lighter than that on disc of 

 dorsum ; pleurae clothed with pale yellowish hair, a tuft of 

 black hair immediately in front of and below base of wing. 



* For names and illustrations of colours, see Ridgway, ' A Nomen- 

 clature of Colors for Naturalists' (Boston: Little, Brown, & Company, 

 1886). 



