SOME BLOOD-SUCKING AND OTHEE DIPTEKA FKOJU THE ANGLO-EGYPTIAN SUDAN 55 



fleck ; ;i sinuous clear mark extending from the under side of the end of the second vein, to 

 the hind margin below the end of the main stem of the third vein, and a similar but shorter 

 mark on the inner side of this, starting from the second vein and sometimes fused with the 

 first mark just above the third vein, usually conspicuous ; for reinainhui u-ing-inarkiii<js, 

 see plate. 



Halteves: knob dark brown, stalk white or yellowish white. 



^. — A small brown fleck above base of antennae ; first joint of antennae clothed with 

 long and fine browTaish hair ; second joint produced above into a dark prominence ; third 

 joint, especially expanded portion, pale brown ; terminal joint of palpi oval, clothed on outer 

 side with long and fine brownish hair ; upper three-fourths of eye composed of very large 

 facets, which extend to hind margin; median portion of dorsum of thorax clothed with long 

 and fine brownish hair, pleurae thickly clothed with white hair. 



$. — Transverse callosity above antennae rather narrow, shining reddish brown, uniform 

 in width, and, in specimens in good condition, partly interrupted in median line by a yellowish 

 pollinose depression, which is connected by a narrow dark-brown mark with the base of each 

 antenna ; uppermost of the usual three dark brown spots (arranged in a triangle) on front 

 above transverse callosity, smaller than the other two, and sometimes indistinct ; ground 

 colour of front greyish, with a pair of brown triangular flecks on vertex, and sometimes 

 a Y-shaped brown mark separating the dark-brown spots, and extending to the transverse 

 callosity ; basal portion of third joint of antennie, broad ; palpi buiF-coloured, distal joint 

 long and narrow, on outer side browaiish, except basal fourth and extreme tip, and clothed 

 with dark brown hair ; sides of first four abdominal segments grey ; dorsum of fourth ami 

 following segments (in well-preserved specimens) with a pair of rounded greyish pollinose 

 spots at the base, one on each side of median stripe. 



Described from a $ and $ from Salisbury, Mashonaland, November — -December, 1899 

 {G. A. K. Marshall). Types in British Museum (Natural History). 



A single $ specimen of this species, without label showing precise locality, was received 

 from Dr. Balfour. The geographical range of //. pulchrithonuv, as indicated by specimens 

 in the Museum collection, extends from Zululand to the Sudan, and includes British Central 

 Africa and Uganda. In the latter country, the species was met with at Fajao, on the 

 Victoria Nile, in November, 1904, by Captain E. D. W. Greig, I.M.S. 



What is perhaps a sub-species of //. pulchritlwrair is represented in the Museum 

 collection by a single female from the Lunyina Kiver, Heuga, British Central Africa, 

 January 29th, 1894 [Captain R. Crawsliay) ; this individual differs from the typical form in 

 the first joint of the antennae being more slender, and the wing-markings more confluent, 

 especially towards the hind margin, while the space beyond the stigmatic patch on the costal 

 border is almost clear. A closely allied species also occurs in Somaliland, and is distinguished 

 in the female sex, as shown by a single specimen presented in 1894 [Th. Greenfield) by its 

 paler front, by the greater depth of the supra-antennal transverse callosity, and of the grey 

 hind margins to the distal abdominal segments, &c. 



Ha'iiwtopota 2)ii.lchrithora,i' belongs to a group of species, the members of which resemble 

 one another very closely in the pattern of the marking, both of the dorsum of the thorax 

 and of the wings. These species difler in various respects, such as the depth and shape of 

 the transverse supra-autennal callosity, the width of the basal portion of the third joint of 

 the antenna, &c. ; but the markings referred to are of the same type in all. The grey 

 median thoracic stripe, most clearly exhibited by good specimens of //. pukhrithonu: (see 



