346 DURHAM DIPTEBA. 



XLVIII. 589. 



TABLES OF SPECIES. 



589. Anthomyza, Fin. 



1 (2). Hoary grey species. (2560. grisea, Fin.) 



2 (1). Black species. 



3 (4). Abdomen all black; legs yellow with the last tarsal 



joint dark. (2561. gracilis, Fin.) 



4 (3). Abdomen black, pale beneath and at the base ; legs 



entirely yellow, including the last tarsal joint. 



(2562. flavipes, Ztt.) 



590. Geomyza, Fin. 



1 (4). Dorsum shining orange. 



2 (3). X.4. distinctly clouded. 



Balioptera combinata, L. (576 back) 



3 (2). X.4, not clouded. (2515. Balioptera venusta, Mg.) 



4 (1). Dorsum blackish grey. 



5 (6). Wings almost clear with three dark brown spots. 



Balioptera tripunctata, Fin. (576 back) 



6 (5). Wings blackish brown with clear streaks or spots ; 



costa spined as in Helomyzida?. 



(2563. Geomyza marginella, Fin.) 



591. Dl AST at a, Mg. 



Life history unknown. 



1 (5). The X-veins clouded, or with brown bands crossing 



the X-veins ; costa spined. 



2 (3) (4). Wings plain greyish, not banded, but the X-veins 



and the tips of V.2., V.3., and V.4. clouded. 



(2566. Geomyza obscurella, Fin.) 



3(2) (4). Wings greyish, a dark spot at the base of V.I.; 



X.5 2 banded; X.4. not clouded. 



(2570. unipunctata, Ztt.) 



4 (2) (3). Wings strongly brownish with two dark bands from 



V.3. to V.5. over the X-veins ; a clear band between 



X.4. and X.5 2 , and another beyond the X.5 2 band. 



2573. Diastata nehdosa, Fin. 



Shull, 1 $, September, 1900. 



