DTJEHAM DIPTEEA. 1 59 



XXV. 260. 



2 (3). Back of the head yellow. Yellow species, with some- 

 times a streak on the dorsum. Last joint of the 

 antennae, the vertical spot, and the last tarsal 

 joint, black. (!369. lutea, Pz.) 



8 (2). Back of the head all black, or at least black above. 

 Antennae, vertical spot, and last tarsal joint black 

 or dark brown. 



4 (5). Dorsum with three stripes. Yellow species with brown 



abdomen. 



Lonchoptera trilineata, Ztt. 

 Gibside, 1 ?, April ; Bishop Auckland, 1 ?, March, 

 1898; Harperley, 1 ?, April, 1900. 



5 (4). Dorsum with only one stripe. 



6 (7). Abdomen all dark brown, at most the tip yellow. 



1370. Lonchoptera punctum, Mg. 

 Bishop Auckland, 1 $, March, 1898 ; Harperley, 2 ?, 

 April, 1900 ; Belburn, 1 $ , May, 1900. 



7 (6). Abdomen yellow at the sides and behind. 



(137 1. flavicauda, Mg.) 



8 (1). Dorsum grey or grey-brown, with or without stripes. 



9 (10). Frons whitish yellow. A dirty brown species, with 



yellow legs and halteres, and brown tinged wings. 

 1372. Lonchoptera lacustris, Mg. 

 Gibside, 1 $ and 1 $, April, 1898; Harperley, 2 $, 

 April, 1900; Bishop Auckland, 2 ?, February- 

 March, 1898. 



10 (9). Frons shining dark brown. Brown species with 

 brown halteres and dirty yellow legs. Upper side 

 of the femora and tibiae with a brown streak near 

 the tip. Wings tinged brown. 



1373. Lonchoptera tristis, Mg. 

 Bishop Auckland, 3 ?, January, 1902. 



