DURHAM DIPTERA. 373 



LII. 



2 (1). Eyes oval ; dorsum bare on the centre, bristly at the 

 sides. 642. Cacoxenus, Lw. (2726. i?idagator,'Lw.) 

 The larvae prey on the stores of Osmia emarginata. 



Family LIIL— AGROMYZID^E. 



TABLE OE GENERA. 



1 (4). Mouth bristles absent. 



2 (3). Fronto-orbital bristles present. 



Ochthiphila, Fin. (650) 



3 (2). Fronto-orbital bristles absent. Leucopis, Mg. (649) 



4 (1). Mouth bristles present. 



5 (6). V.3. and V.4. converging towards their ends. 



Liomyza, Mcq. (648) 



6 (5). V.3. and V.4. almost parallel. 



7 (8). Third antennal joint with a thorn-like tip (VII. 20). 



647- Ceratomyza, Schin. (2744. denticornis, Pz.) 



8 (7). Third antennal joint without this point. 



9 (10) (11). Third antennal joint round, and of moderate size. 



Agromyza (646) 



10 (9) (11). Third antennal joint thick, the apex pointed on 



the upper side. Schgenomyza, Hal. (651) 



11 (9) (10). Third antennal joint quadrate and very large. 



644. Phyllomyza, Fin. (2728. securicornis, Fin.) 



\Milichidcz\ 



TABLES 0E SPECIES. 



646. Agromyza, Fin. 

 Larvae mostly leaf-miners. 



1 (22). Halteres white or yellow. 



2 (7). V.4. almost invisible. 



3 (4). Costa nearly bare at the base. 



(2731. lacteipennis, Fin.) 



4 (3). Costa spined. 



5 (6). Frons all black, or at most with a small spot over the 



antennae. ( 2 73°- vagans, Fin.) 



6 (5). Frons orange, darker on the vertex. 



(2732. obscurella, Fin.) 



