DURHAM DIPTERA. 273 



XXXIII. 469. 



4 (2) (3). Thorax with one central rhomboidal spot; scutellum 



black with white edges. (2083. pratincole, Pz.) 



5 (1). Abdomen windowed with 6-8 small grey rectangular 



patches on a black ground in the male; plain 

 grey, or with black centre line, in the female. 



6 (7). Abdomen in the male with the black bands even and 



flat ; in the female grey, with a long black line ; 

 thorax indistinctly striped. 



2084. Anthomyia radicum, L. 

 Very common everywhere. 



7 (6). Abdomen in the male with the black bands depressed, 



forming four transverse grooves ; female grey and 

 unmarked. 



2085. Anthomyia sulciventris, Ztt. 

 Bedburn, 1 $, May; Bishop Auckland, 1 $, July, 

 1900. 



470. Chortophila, Mcq. 



1 (10). Forehead and face very prominent. 



2 (7). Arista nearly bare. 



3 (6). X.5 2 nearly straight. 



4 (5). Large species, 7-8 mm. Abdomen not flattened. 



(2086. buccata, Fin.) 



5 (4). Small species, 4 mm. Abdomen flattened. 



(2089. arenosa, Ztt.) 



6 (3). X.5 2 bent. (2087. unilineata, Ztt.) 



7 (2). Arista pubescent or short haired. 



8 (9). Subanal process in the male small. 



(2088. albescens, Ztt.) 



9 (8). Subanal process in the male lobular and large. 



2094. Chortophila trapezina, Ztt. 

 Harperley, 1 g , June, 1900. 



10 (1). Forehead and face but slightly prominent. 



11 (12). X- veins clouded. (2098. longnla, Fin.) 



12 (11). X-veins clear. 



13 (16). Abdomen with a row of central somewhat triangular 



spots. 



R 



