NORTH-EASTERN RHODESIA AND THE CONGO FREE STATE. 277 



cox9e, front femora, and outer surface of front tibiae clothed with chrome- 

 yellow hair ; inner and under surfaces of front tibiaa clothed with minute 

 black hairs. 



Katanga, S.E. Congo Free State : Kundelungu, plateau east of Lufira R., 

 5000-6000 ft., between Aug. 2S and Sept. 3, 1907 {Br. Sheffield Neave). 



In addition to the wing-markings, the dark and very prominent frontal 

 callus, the sharply defined ocellar spot, the incrassate first joint of the 

 antennae, and the slender front tibise will serve to distinguish Chri/sops neavei 

 from C. silacea, Austen, the only known African species with which it could 

 possibly be confused. 



C. neavei is named in honour of its discoverer. 



Genus DIATOMINEUEA (Subgenus CORIZONEUEA), Eond. 



Diatomineura virgata, sp. n. (Fig. 2.) 



(^ $ . — Length, (^ (3 specimens) 18 to 20 mm., $ (2 specimens) 17 to 

 18 mm. ; width of head, S' 4*8 to 5 mm., $ 4*8 mm. ; width of front of ? 

 at vertex 1 mm. ; length of proboscis, (^ 18*4 mm., ? 19 mm. ; length of 

 wing, c? 15 to 16*5 mm.^ ? 16 mm. 



Bodi/ rather narroiv and elongate, at least 171 ^ • dorsum of thorax gallstone- 

 yellow pollinose, ivith tJiree conspicuous, black or clove-brown, longitudinal 

 stripes; abdomen ochraceous, dorsum ivith a median series of black blotches, 

 dorsum of fifth and sixth segments in <^ ivholly black, except lateral margins 

 and posterior angles, and also extreme hind margin of fifth segment ; ivings 

 sepia-coloured, costal cells mummy-brown ; legs ochraceous-rufous, tips of tarsi 

 brown. 



Head buff-yellow poUinose, sides of face brown ; face prominent, with an 

 elongate, sub-triangular, shining black callus on each side below antenna ; in 

 $ vertex clove-brown, and a spear-head-shaped blackish mark on front, in 

 middle line above base of antennae ; jowls and basi-occipital region clothed 

 with dull whitish hair ; palpi dark brown or clove-brown in ^ , cinnamon- 

 rufous in $ ; proboscis clove-brown ; first and second joints of antennce fawn- 

 coloured, pollinose, third joint orange-rufous. Thorax : median black or 

 clove-brown stripe on dorsum rather narrow, straight, extending from front 

 margin to praesutural furrow^ in ? sometimes partly obscured posteriorly by 

 yellow pollen ; outer clove-brown stripes about twice as broad as median 

 stripe, extending from anterior margin to inner angles of postalar calli^ their 

 outer edges curved ; admedian gallstone-yellow stripes darker than sides of 

 dorsum, with a lighter yellow streak on their outer margins in front ; dorsum 

 of thorax clothed with short, bright, ochre-yellow hair, posteriorly and on 

 posterior portion of dark stripes, especially in ^, intermingled with or 

 entirely or in part replaced by fine, erect^ black hair ; pectus and pleur^ie 

 clothed with cream-buff-coloured hair ; a ridge of black hair running from 



