WEST AFRICAN TRYPETIDJE. 



163 



Head. Upper two-thirds of front canary-yellow, ocellor spot black, fronto- 

 orbital bristles black ; lower third of front, frontnl lunule, and insertion 

 of antennae brown. Face below antennae brown, then cream-white to oral 

 margin. Antennae pale brown, arista dark brown, pale at base^ plumose. 

 Eyes dark purple-brown, palpi and proboscis pale brown. The head 

 is coloured thus in dried specimens, but in life the colour scheme is 

 very complicated and brilliant, as shown in the accompanying sketch. 



EmeiralcL o^ree,r\ 

 Purple --.__ 

 Ertaerald green- 

 Purple 



Exnerald greerv- 

 P-arple 



Black 



- Canary yellow 



---Purple 

 ^ ^^_ , , -Canary yeHoAv 



— Black 



Creayn ~wMte 



Head of Ceratitis nigra, Graham. 



Thora.r shiny black ; scutellum shiny black, with four black bristles and an 

 indistinct yellow spot on the outer margins. Abdomen triangular, shiny 

 black, with a broad transverse grey band occupying the median half of the 

 4th segment. Ovipositor black, convex above, flattened beneath, apex yellow, 

 as long as the last three abdominal segments. Legs : femora dark brown, 

 tibia3 and tarsi yellow. Wings hyaline, with a broad dark brown band 

 covering the basal portion and extending along the costa to the apex of the 

 wing, leaving behind a clear triangular area with its base on the posterior 

 margin of the wing. From the apex of this triangle a narrow curved brown 

 band crosses to the apex of the 5th longitudinal vein. Between the costa and 

 the brown band is a clear, very narrow band extending the length of the 

 marginal cell and expanding into two clear spots, where the 2nd vein reaches 

 the costa. The wing is pale at its insertion, and there is a small triangular 

 clear space lying between the humeral cross vein and the apex of the 

 auxiliary vein, its base being on the costa, its apex on the 3rd vein. This 

 space contains a dark spot in the costal cell and projections of brown colour 

 enter the space from the sides, giving it a spotted appearance. Halteresj 

 both stem and knob, brown. 



Length 5*5 mm., excluding ovipositor ; breadth across expanded wings 

 13 mm, 



V2 



