DUEHAM DIPTEEA. 77 



XII. 120. 



8 (9). Wings somewhat pellucid. Femora, when mature, 



blackish, leaving only the basal third yellowish. 



750. Limnophila dispar, Mg. 

 Harperley, 3 $, 4-6-00. 



9 (8). Wings distinctly yellowish. Femora with only the 



tip dark. 



751. Limnophila lineola, Mg. 

 South Durham, 1 ?. 



10 (7). Stigma absent. 



11 (12). O. closed. 



752. Limnophila lineolella, Verr. 

 Wearhead, 1 ?, 4-8-01 ; Bedburn, 1 #, 1 ?, 7-7-02. 



12 (11). O. open. (753* aperta, Verr.) 



13 (6). Thorax entirely yellow, no trace of a central black 



line. (754- ferruginea, Mg.) 



14 (3) Fork of V.4.a. four times as long as the handle. 



V.2 2 much arched. 



755. Limnophila ochracea, Mg. 

 Bishop Auckland, 1 $, 15-7-02; Hesleden, 2$, 3?, 

 August, 1902. 



15 (2). V.2 1 three or four times as long as V.2 2 (IV. 21). 



Base of V.2. clouded. 



16 (17). Blackish grey species. (756. bicolor, Mg.) 



17 (16). Yellowish species. (757- punctum, Mg.) 



18 (1). X.2. distinctly before the end of V.l.b. V.2 1 always 



long (IV. 21). 



19 (28). Fork of V.4.a. almost as long as the handle, some- 



times longer. 



20 (25). X.5. at or beyond the middle of O. (IV. 21). Antennae 



bearing bristly hairs three or four times as long as 

 each joint. 



21 (22). Entirely yellow species. (758. fuscipennis, Mg.) 



22 (21). Disc of the thorax shining dark brown. 



23 (24). X.5. near the outer end of O. X-veins clear. 



759. Limnophila discicollis, Mg. 

 Bedburn, 1 $, 7-7-02. 



