June 1899.] BeutenmOcLer : New African Sesiid^. 171 



Habitat: Valley of the Ogowe River, French Congo, i^. Coll. 

 W. J. Holland. 



May be known by the golden orange red thorax and violet abdo- 

 men. 

 Sesia albiventris, sp. nov. 



Head black above, front white ; palpi white, tip black. Antennae black ; thorax 

 black, white on each side beneath ; patagia tipped with white posteriorly. Abdomen 

 black with a metallic green reflection and a narrow white ring on the 4th segment ; 

 last segment edged with white, anal tuft black; underside of abdomen white on the 

 3d, 4th, and 5th segments. Legs black, annulated with white, middle femora and 

 anterior coxre white. Fore wings violet black with a basal transparent streak and a 

 small spot composed of white scales beyond the middle. Hind wings transparent, 

 border and fringes violet black. Wings beneath as above. Expanse, II mm. 



Habitat : Valley of the Ogowe River, French Congo, i S . Coll. 

 W. J. Holland. 



Sesia olenda, sp. nov. 



Wholly bronzy violet-black above and below, except the fore coxae, ringlets on 

 legs and palpi white; last joint of palpi black. Fore wings with a very small 

 rounded transparent mark in the cell and a large transparent area beyond the 

 transverse mark. Expanse, 15 mm. 



Habitat : Valley of the Ogowe River, French Congo, i 9 . Coll. 

 W. J. Holland. 



Sesia nyanga, sp. nov. 



Head, thorax and abdomen above and below bronzy black, except the last two seg- 

 ments beneath white. Anal tuft bronzy black. Fore wings largely transparent, 

 borders and transverse mark very narrow, black ; similar beneath with the costa yel- 

 lowish. Legs black, middle coxse white. Expanse, 17 mm. 



Habitat . Valley of the Ogowe River, French Congo, i 9 . Coll. 

 W. J. Holland. 



Sesia nuba, sp. nov. 



Head black, front white on each side ; antennae black, ferruginous beneath ; 

 palpi with loose hairs, black, white at tip. Thorax and abdomen bronzy black, the 

 latter with a pale, dirty yellowish band on the 2d, 4th, and two last segments, encirc- 

 ling the body ; legs black with white ringlets, hind pairs with loose black hairs ; fore 

 •coxae white. Fore wings transparent, borders and transverse mark, moderately 

 broad, bronzy black. Hind wings transparent, border narrow, bronzy-black. Ex- 

 panse, 14 mm. 



Habitat: Valley of the Ogowe River, French Congo. 2$ $. 

 Coll. W. J. Holland. 



One example differs by having the last four segments of the abdomen 

 ringed ; the transverse mark on fore wings orange outside, a little 



