Il8 DURHAM DIPTERA. 



XXIII. 192. 



44 (43) (47). Dorsum with two black lines. 



45 (46). Pleurae all yellow. (1026. bilineata, Lw.) 



46 (45). Pleurae with dark marks. 



1025. Empis punctata. 

 Common. Bishop Auckland, Harperley, Escomb, 

 io $ and 4 ? , May-June, 1897-1900. 



47 (43) (44). Dorsum with three black stripes, of which the 



middle one is long, the side ones short. 

 1024. Empis trigramma, Mg. 

 Common everywhere, May-June. 



193. Pachymeria, Steph. 



1 (2). Palpi yellow, generally hidden, male organ orange 



at the end. (1048. femorata, F.) 



2 (1). Palpi black, hairy, and prominent; male organ all 



black. (1049. palparis, Egg.) 



195. Hilara, Mg. 

 Life history unknown. 



TABLE OF SPECIES. 



1 (31). Dorsum black or grey. 



2 (5). Fore tibiae and tarsi thickly fringed with long hairs 



outside. 



3 (4). Wings greyish. Legs orange with the tarsi and the 



ends of the tibiae black. (1051. matrona, Hal.) 



4 (3). Wings yellowish, legs pale yellow with brown tarsi. 



(1052. cilipes, Mg.) 



5 (2). Fore tibiae and tarsi with only a few, not specially 



long hairs, or bare. 



6 (13). Legs yellow or light brown. 



7 (10). Halteres white or yellow. 



8 (9). Dorsum unstriped ( ? ), or with one stripe ( $ ). Fore 



metatarsi much thickened. (1067. litorea, Fin.) 



9 (8). Dorsum with two stripes. Legs yellow, hind tibiae 



and all tarsi black. Size, 2 mm. 

 1066. Hilara canescens, Ztt. 

 Bishop Auckland, 1 $, 4 ?, July, 1901 ; Harperley, 

 2 $, June, 1900; Hesleden, 1 ?, August, 1902. 



