DURHAM DIPTERA. 34 1 



XLIV. 575. 

 575. Lauxania, Ltr. 



1 (4). Antennae longer than the face, very thin and almost 



pointed in front ■ wings strongly orange tinged. 



2 (3). Wings with a blackish spot at the base. 



(2506. cylindricornis, F.) 



3 (2). Wings not spotted at the base. ( 2 5°7- 'elisce, Mg.) 



4 (1). Antennae shorter, or at most as long as the face, not 



very thin, and with the third joint elliptical ; wings 

 clear or faintly tinged. 



5 (6). Face yellow. ( 2 5°8. atrimana, Mg.) 



6 (5). Face shining black or dark green. 



7 (8). Body greenish bronze ; wings yellow tinged • squamae 



yellow. 



2509. Lauxania cenea, Mg. 



Hesleden, Waskerley, Bishop Auckland, 6 $ and 6 ?, 



June-August. 



8 (7). Body bluish black \ wings clear ; veins white ; squamae 



white. ( 2 5 JI ' hyalinata, Mg.) 



Family XLV.— OPOMYZID^E. 



TABLE OP GENERA. 



1 (2). Head semicircular, almost flat behind ; wings spotted. 



Opomyza, Fin. (577) 



2 (1). Head round, inflated behind ■ wings unspotted. 



Pelethophila, Hagenb. (578) 



tables op species. 



576. Balioptera, Lw. 

 Life history unknown. 



(For characters, see under Geomyza, 590*). 

 2513. Balioptera tripunctata, Fin. 

 Bishop Auckland, 1 $, October 25, 1901. 



2514. Balioptera combinata, L. 

 Hesleden, 2 $ and 1 $, August, 1900. 



* Where a genus or species is repeated in different parts or tables it is owin 

 either to the different arrangements of authors or to the possession of the character 

 of more than one family, &c, or for greater clearness. 



