274 DURHAM DIPTERA. 



XXXIII. 470. 



14 (15). X.5 2 straight and upright. (2090. striolata, Fin.) 



15 (14). X.5 2 oblique. (2092. cinerella, Fin.) 



16 (13). Abdomen without a row of triangular spots. 



17 (20), Anal abdominal segment large and bent inwards. 



18 (19). Costa ciliated along its whole length with short 



spines. ( 2 °93- curvtcauda, Ztt.) 



19 (18). Costa with a. large costal spine and a few short hairs 



along the basal third. 



2095. Chortophila sepia, Mg. 

 Bishop Auckland, 1 $ , April, 1900. 



20 (17). Abdomen long, conical, and pointed in both sexes. 



21 (22). Thorax striped. ( 2 °97» sylvestris, Fin.) 



22 (21). Thorax unstriped. (2096. billbergi, Ztt.) 



471. Phorbia, Dsv. 



1 (2). Forehead and face very prominent ; pale whitish grey 



species. (2089. Chortophila arenosa, Ztt.) 



2 (1). Forehead and face only slightly prominent. 



3 (17) (20). Thorax marked with three stripes. 



4 (5). Hind femora tufted with hair at the base beneath. 



2099. Phorbia floccosa, Mcq. 

 Bishop Auckland, 2 $, May, 1 900-02. 



5 (4). Hind femora not tufted. 



6 (9) (16). Abdomen oblong. 



7 (8). Abdomen with a rather long interrupted central 



stripe. (2100. transversalis, Ztt.) 



8 (7). Abdomen with a slender continuous stripe. 



2102. Phorbia pudica, Rnd. 

 Belburn, 1 $, May, 1900. 



9 (6) (16). Abdomen narrow, fiat, tapering. 



10 (13). Hind tibiae with a row of short even bristles on the 



whole length of the inner side. 



11 (12). Mid metatarsi with long hairs on the upper side. 



21 11. Phorbia trichodactyla, Rnd. 

 Bishop Auckland, 1 $, May, 1902. 



