DURHAM DIPTERA. 255 



XXXIII. 454. 



9 (7) (8). Hind tibiae more or less rufous. 



1992. Spilogaster communis, Dsv. 

 Hesleden, i $, August, 1900; Shull, 1 $, Sept., 1900. 



10 (3) (4). Thorax marked with large spots. 



11 (12). Scutellum with two side spots. (1988. maculosa, Mg.) 



12 (11). Scutellum with one central spot. (1989. notata, Fin.) 



13 (2). Legs more or less pale in the male. 



14 (15). Abdomen yellow and translucent at the base. 



(2000. uliginosa, Fin.) 



15 (14). Abdomen grey. 



16 (21). Dorsum indistinctly striped. 



17 (18). Four post-sutural bristles. (i994« quadrum, Fin.) 



18 (17). Three post-sutural bristles. 



19 (20). Eyes touching in the male ; base of antennae pale. 



(1996. depuncta, Fin.) 



20 (19). Eyes of the male slightly separate ; antennae quite 



black. (1997. testrastigma, Mg.) 



21 (16). Dorsum distinctly striped ; four post-sutural bristles. 



22 (23). Hind tibiae with very long bristles on the outer side ; 



eyes of the male nearly touching. 



(1998. flagripes, Rnd.) 



23 (22). Tibiae with four or five spines at the tips ; eyes of 



the male rather widely separated ; costa strongly 

 ciliated at the base. 



2006. Spilogaster ciliatocosta, Ztt. 



Shull, 1 $, April, 1900. 



24 (1). Arista rather short haired. 



25 (29). Scutellum with a dark basal mark. 



26 (30). Hind femora entirely orange. 



27 (28). Eyes of the male not quite touching; base of antennae 



pale. (2002. consimilis, Fin.) 



28 (27). Eyes of the male touching. (2003. pertusa, Mg.) 



29 (25). Scutellum unmarked. 



30 (26). Hind femora partly dark. 



31 (32). Frons prominent; eyes of the male not nearly 



touching. ( J 999" protuberans, Ztt.) 



32 (31). Frons not prominent; eyes of the male nearly touch- 



ing; hind tibiae hairy. (2003. spinifemorata, Mde.) 



