DURHAM DIPTERA. 115 



XXIII. 191. 



45 (46). Thorax grey. (1016. sciarina, Fin.) 



46 (45). Thorax shining black. 



1017. Ramphomyia umbripennis, Mg. 

 Bishop Auckland, 2 $ and 3 ?, June-July, 1901-02; 

 Brancepeth, 2 $, June, 1902. 



47 (44). Legs feathered. 



48 (49). Large species, 3 mm. Hind femora feathered ; hind 



tibiae ciliated. ( IOI 5- cethiops, Ztt.) 



49 (48). Small species, 1 mm. Female hind tibiae ciliated on 



outer side. (ion. gibba, Fin.) 



50 (1). Yellow species. 



10 1 8. Ramphomyia flava, Fin. 

 Hesleden, 1 $ and 9 2 , July- August, 1900. 



192. Empis, L. 

 Life history not fully known. 



1 (40). Thorax black or grey without a sign of yellow. 



2 (11). Large species, at least 6 mm., generally more. 

 8 (8). Dorsum unstriped, or with two or three stripes. 



4 (7). Legs with at least the fore and mid femora dark. 



5 (6). Dorsum grey with three dark stripes, large species, 



10 mm. 



10 1 9. Empis tessellata, F. 

 Common everywhere. 



6 (5). Dorsum shining black, with white reflections in certain 



lights. Small species, 6 mm. (1031. lucida, Ztt.) 



7 (4). Legs all yellow with dark tarsi and joints. 



1020. Empis livida, L. 

 Hesleden, 2 $ and 9 5, August, 1899-1900. 



8 (3). Dorsum with four stripes. 



9 (10). Male tibiae ciliated outside. Wings of the female 



very broad. Brown species. 



1022. Empis borealis, L 

 Wearhead, 1 2 , June, 1901. 



