DURHAM DIPTERA. 385 



LVII. 



10 (9). Arista dorsal ; third antennal joint short in both 

 sexes ; head bristles in three horizontal rows of 

 four bristles each in addition to the post-antennal. 



Phora, Ltr. (663) 



TABLES OF SPECIES. 

 659. CONICERA, Mg. 



1 (2). Third antennal joint in the male 2\ times as long as 



its basal breadth. (2835. atra, Mg.) 



2 (1). Third antennal joint about i£ times as long as 



broad. (2836. similis, Hal.) 



662. Trineura, Mg. 



1 (4). Hind tibia? with only one outer bristle on the basal half. 



2 (3). Fore tarsi not dilated ; mid tibia? with 4-5 outer 



bristles in the male and 2-3 in the female. 

 2839. Trineura aterrima, ¥ .z^stictica, Mg. 

 Wearhead, 4 $, August, 1901 ; Bishop Auckland, 

 4 ?, May-June, 1902. 



3 (2). Fore tarsi dilated ; mid tibia? with 5-7 outer bristles 



in the male and always three in the female. 



(2840. velutt'na, Mg.) 



4 (1). Hind tibia? always with two outer bristles on the basal 



half; wings brownish yellow in the male. 



(2841. schtneri, Beck.) 



663. Phora, Ltr. 



1 (80). All frontal bristles, including the two post-antennal 



ones, directed backwards ; frons without a central 

 furrow or indented line ; tibia? with long strong 

 bristles, in addition to the terminal spurs. 



2 (65). V.3. forked. 



3 (12). Only three distinct thin-veins present. 



4 (5). Palpi extraordinarily large, larger than the head in 



the male kidnev-shaped and directed upwards. 



{palposa, Ztt.) 



