DURHAM DIPTERA. 69 



XII. 97. 



6 (1). V.l.b. continued much beyond X.2. 



7 (16). Wings with spots and clouds, or at least three black 



spots near the costa. 



8 (13). Thorax chiefly blackish, wings clouded, besides the 



three spots near the costa. 



9 (12). Wings clouded all over, and with three black spots 



near the costa. Antennal joints elongate, with 

 hairs much longer than the joints. 



10 (11). Femora with at least two clearly defined dark rings. 



674. Limnobia nubeculosa, Mg. 

 Common in the Bishop Auckland district in May 

 and June. It was very abundant at Raby on yew, 

 29-5-01. 



11 (10). Femora with only one clearly defined dark ring at 



the tip. 



675. Limnobia flavipes, F. 



Shipley Moor, i $, 27-5-98. Hesleden, 1 $, 2?, 



20-6-02. 



12 (9). Wings with slight cloudings and three blackish spots 



near the costa. Antennal joints oval with hairs 



only rather longer than the joints. 



(676. analis, Mg.) 



13 (8). Thorax chiefly clear shining yellow. Wings with 



three spots near the costa, but not clouded. 



14 (15). Fore femora with only the basal third yellow, the rest 



black. (677. nigropunctata, Schum.) 



15 (14). Fore femora nearly all yellow, with only a ring near 



the tip black. 



678. Limnobia tripunctata, F. 

 Shipley Moor, 1 $, 27-5-98. Bishop Auckland, 2 $, 

 1?, 27-6-02; 1$, 16-7-02. Hesleden, 2$, 2$, 

 August, 1902. 



16 (7). Wings clear, without markings. 



17 (18). Frons and face yellow. Female femora entirely 



yellow, without any dark ring at the end. 



(679. stigma, Mg.) 



