DURHAM DIPTEEA. 93 



XV. 143. 



7 (4). Upper side of the abdomen black with yellow side- 



spots on the middle segments, besides the yellow 

 tip. 



8 (11). Scutellum black, the thorns and at most a narrow 



border yellow. 



9 (10). Dorsum black with a narrow pale yellow stripe at the 



sides, and a like-coloured spot before the base of 

 the wing. Small species, size 3 mm. Legs yellow 

 with black rings on the femora and tibiae. 



(857. fiygmcea, Fin.) 



10 (9). Dorsum with a whitish stripe on each side, forming a 



minute spot in front, a larger spot before the base 

 of each wing, and a third spot behind. Larger 

 species, 5 mm. Legs yellow, femora with broad 

 black rings, hind tibiae black, yellowish at the base, 

 tarsi black. (862. morrisii, Curt.) 



11 (8). Scutellum and thorns yellow, sometimes the sides 



black. 



12 (19). Legs mostly yellow. 



13 (16). Femora entirely yellow. 



14 (15). Antennae black. Dorsum of the female yellow, with 



three black stripes united behind. 



(859. formosa, Mg.) 



15 (14). Antennae brown. Dorsum of the female black, with 



yellow side-stripes, and with two yellow dashes on 

 the middle, which are not united with the side 

 stripes. (863. pardalina, Mg.) 



16 (13). Femora yellow, black at the base or on the middle. 



17 (18). Abdomen with only two pairs of yellow side-spots 



and a yellow anal spot. (866. pulchella, Mg.) 



18 (17). Abdomen with three pairs of yellow side-spots and a 



yellow anal spot. (87 5. fallenii, Staeg.) 



19 (12). Legs mostly black, tibiae brownish. (854. dives, Lw.) 



20 (1). Abdomen green or greenish yellow with black spots 



or bands. (867. trilineata, F.) 



