460 Mr. W. F. Kirby on the 



*12. Halter Bettoni, sp. n. 



Dimensions. — 



6. 2- 



Long, corp 21 mm. 15 mm. 



Exp. al. ant '. 48 „ 46 „ 



Long. al. post. . . (circa) 50 ,, 54 ,, 



Body reddish brown, beak (except at the tip) and sides and 

 under surface of thorax testaceous ; abdomen slender, slightly 

 hairy towards the extremity. Fore wings hyaline, with 

 brown nervures, the costal nervure and the second median 

 nervure spotted with paler in the spaces between the trans- 

 verse nervures. Subcostal nervure slightly reddish. Towards 

 the extremity of the wing is a dark pterostigma, filling up 

 the narrow oblong space between two approximate nervures, 

 but not extending quite to the costa. Hind wings very long 

 and slender, white, with a yellowish central line, from which 

 numerous small blackish T-shaped markings diverge asym- 

 metrically on each side. The extremity is broadly triflabel- 

 late, with a reddish-brown band extending over the first ex- 

 pansion, except at the base, and the basal portion of the second ; 

 the terminal part of the wing snow-white. 



Ilab. Maragoja Fundi, Tara Desert, British East Africa ; 

 a pair collected by Mr. 0. S. Betton on March 3, 1897. 



A very distinct species, somewhat allied to the West- 

 African H. imperatrix^ West wood. 



The- costal nervures vary in number from 33 to 37 before 

 the pterostigma on the fore wings, and are not uniform on 

 the two sides, showing that this is a variable character. 



*13. Halter imperatrix. 



Nemoptera imperatrix; Westwood, Trans. Ent. Soc. Lond. (3) v. p. 507 

 (18G7) ; Tkes. Ent. Oxon. p. 178, pi. xxxiii. fig. 8 (1874). 



Ilab. W. Africa. 



14. Halter remijiennis. 

 Nemoptera remipennis, Kolbe, SB. Ges. naturf. Fr. Berlin, 1900, p. 13. 

 Ilab. Nyassa, Usambara. 



15. I J alter togonica. 

 Nemop>tera togonica, Kolbe, SB. Ges. naturf. Fr. Berlin, 1900, p. 15. 

 Hab. Togo, Upper Guinea. 



