342 DURHAM DIPTERA. 



XLV. 577. 



577. Opomyza, Fin. 



Life history unknown. 



1 (2). Dorsum with dark stripes. 



2516. Opomyza germinationis, L. 

 Common everywhere. 



2 (1). Dorsum unstriped. 



2517. Opomyza florum,¥. 

 Hesleden, 1 ?, August, 1899. 



578. Pelethophila, Hagenb. 

 Life history unknown. 



1 (2). Antennae yellow; third joint black. (2519. lutea, Fin.) 



2 (1). Antennae all yellow. 



2520. Pelethophila flava, L. 

 Bishop Auckland, 2 $ and 1 ?, July, 1900; Hancock 

 Museum window, 1 $, 16-8-04. 



Family XLVL— SEPSID^E. 

 table of genera. 



1 (8). V.I .a. present. 



2 (5). Abdomen bent downwards, much narrowed at the 



base, almost petiolate, second segment as if 

 swollen. 



3 (4). Fore femora of the male with teeth or knobs on the 



under side. Sepsis, Fin. (581) 



4 (8). Fore femora often with strong thorn-like bristles, but 



without teeth or knobs. Nemopoda, Dsv. (582) 



5 (2). Abdomen straight, or little bent, nearly as broad at 



the base as in the middle, not petiolate, and not 

 swollen. 



6 (7). X.5 1 awanting; metanotum not much developed. 



Saltella, Dsv. (585) 



7 (6). X.5 1 present; metanotum strongly developed. 



Themira, Dsv. (584) 



8 (1). V.I. not branched, V.I. a. absent. 



586. Mycetaulus, Lw. (2547. bipunctatus, Fin.) 



