DURHAM DIPTERA. 259 



XXXIII. 454. 



65 (66). Scutellum with a black spot on either side of the 



base. (2000. S. uliginosa, Fin.) 



66 (65). Scutellum without such spots. 



67 (68). Scutellum translucent yellow. M. pagana, F. (1981; 



68 (67). Scutellum not translucent yellow. 



69 (72). Three post-sutural bristles. 



70 (71). Abdomen partly translucent yellow. 



(1972. Allceostylus simplex, W.) 



71 (70). Abdomen nowhere translucent yellow. 



{S. demigrans, Ztt.) 



72 (69). Four post-sutural bristles. 



73 (74). Arista pubescent. M. separata, Ztt. (1985) 



74 (73). Arista distinctly plumose. 



75 (76). Dorsum yellowish grey, stripes very indistinct; palpi 



yellow. M. imptmcta, Fin. (1984) 



76 (75). Dorsum blackish grey, distinctly striped ; palpi 



black. M. tirbana, Mg. (1978) 



Spilogaster-Mydaa, &>c. (Females). 



1 (24). Legs all black. 



2 (13). Four post-sutural bristles. 



3 (4). Dorsum uniform black. M. vespertina, Fin. (1975) 



4 (3). Dorsum spotted or striped. 



5 (8). Dorsum spotted. 



6 (7). Scutellum grey, on the base black. 



(1989. S. notata, Fin.) 



7 (6). Scutellum grey with a black spot on each side of the 



base. (1988. S. maculosa, Mg.) 



8 (5). Dorsum more or less distinctly striped. 



9 (10). Crossed frontal bristles present. (S. platyptera, Ztt.) 



10 (9). Frontal bristles absent. 



11 (12). Fore tibia? without bristles; abdomen with reflections, 



the four thoracic stripes all equally distinct. 



(S. ancilla, Mg.) 



12 (11). Fore tibiae with one bristle on the middle ; abdomen 



without reflections, only the two middle stripes 

 distinct. (*S. nebulosa, Stein) 



