DURHAM DIPTERA. 223 



XXXI. 344. 



14 (15). Legs all black; abdomen conical, rather narrow. 



345. Bothria (1700. assimilis, Fin.) 



15 (14). Legs black with orange or light brown tibiae; abdomen 



oval, broad, and much arched. 



345. Bothria (1703. pascuorum, Rnd.) 



16 (1). Palpi black. 



17 (18). Ashen grey species. 



345. Bothria (1703. frontosa, Mg.) 



18 (17). Blue-black species. 



19 (20). V.4. bent in a curve. 



351. Perich^eta, Br. & Berg. (1725. unkolor, Fin.) 



20 (19). V.4. bent at an angle. 



21 (22). Hind tibiae evenly ciliated with only one or two longer 



bristles near the middle. 



1697. Phorocera cilipeda, Rnd. 

 Bishop Auckland, 1 $ and 1 ?, August, 1901. 



22 (21). Hind tibiae furnished with long and short bristles, not 



evenly ciliated. (1698. P. pumicata, Mg.) 



348. Ch^etolyga, Rnd. 



1 (2). Anus black. (17 12. amcena, Mg.) 



2 (1). Anus broadly red. 



3 (4). Third antennal joint remarkably broader than the 



second. 07 11 ' analis, Mcq.) 



4 (3). Third antennal joint not strikingly broader than the 



second. 



5 (6). Dorsum shining black-blue, stripes indistinct, palpi 



brown. ( I 7 I 5- nigrithorax, Egg.) 



6 (5). Dorsum black, dusted with whitish grey; stripes very 



distinct; palpi yellow. (17 14. quadripusttdata, F.) 



349. Tachina, Mg. 



1 (2). Scutellum wholly, or at least at the sides orange. 



(17 16. larvarum, L.) 



2 (1). Scutellum black or grey. 



3 (4). Discal abdominal bristles absent from the middle 



segments. (j? 1 ^. erucarum, Rnd.) 



