DURHAM DIPTERA. 387 



LVII. 663. 



22 (41). Dorsum black. 



23 (36). Scutellum with four bristles. 



24 (27). V.4. straight at its base. 



25 (26). V.4. straight to the margin ; wings brownish ; legs and 



first abdominal segment yellow. 



(abbrevt'ata, v. Ros.) 



26 (25). V.4, bent backwards at the margin ; legs dark brown. 



(2849. concinna, Mg.) 



27 (24). V.4. more or less bent at its base. 



29 (32). Two pairs of dorso-central bristles. 



30 (31). Antennae, palpi, and legs pale orange ; hind tibiae 



with four bristles ; wings unspotted. 



{bergenstammi, Mik.) 



31 (30). Antennae and palpi red-brown ; legs dark brown ; base 



of V.4. with a brown spot. (2850. metadata, Mg.) 



32 (29). Only one pair of dorso-central bristles. 



33 (34) (35). Antennae and palpi red-brown; legs dark ; fore 



tibiae with one, mid with three, and hind with two 

 bristles. (bohemamii, Beck.) 



34 (33) (35). Antennae black ; palpi orange ; legs dark ; fore 



tibiae with two, mid with 6-7, hind with 8-10 

 bristles. (spinosissima, Strobl.) 



35 (33) (34). Antennae, palpi, and legs orange ; fore tibiae with 



one, mid with three, hind with four bristles. 



{excisa, Beck.) 



36 (23). Scutellum with only two distinct bristles. 



37 (38). Palpi long and broad with a single long terminal 



bristle ; costal bristles long and scattered ; frons 



long. 



Phora nudipalpis, Beck. 



Bishop Auckland, 1 $, 14-5-02. 



38 (37). Shape and bristles of palpi normal ; costal bristles 



short ; male frons short. 



39 (40). Fore tarsal joints together scarcely longer than the 



fore tibiae. (2851. unispinosa, Ztt.) 



40 (39). Fore tarsal joints together one and a half times as 



long as the tibiae, (2858. auttunnalis, Beck.) 



