DURHAM BIPTERA. 299 



XXXIV. 486. 



3 (2) (4) (5). Dorsum, pleurae, and abdomen shining yellow, 



sometimes the dorsum black streaked ; margins of 

 the abdominal segments and the triangular ovi- 

 positor black ; abdomen with white hairs in front 

 and black behind. (dispar, Ztt., ?) 



4 (2) (3) (5). Dorsum entirely black, or at least with two 



black stripes ; pleurae yellow without a black stripe ; 

 abdomen black to black-brown, not dusted, black 

 haired ; male lamellae all yellow ; antennae and all 

 the tibiae entirely yellow. 



2204. Parallelomma albipes, Fin. 

 Bedburn, 1 ?, July, 1902. 



5 (2) (3) (4). Dorsum entirely black ; pleurae yellow with a 



black horizontal stripe under the wings ; hind 



tibiae and the tip of the third joint of the antennae 



black-brown. (fiiscitibia, Rnd., ?) 



6 (1). Arista evenly and shortly and thinly haired. 



7 (8). Thorax with fine bristles ; pleurae with a black stripe 



below the wings ; legs and feet very slender, pale 

 yellow, without prominent bristles. 



(2205. vitiata, Mg.) 



8 (7). Thorax normally bristled • no black stripe below the 



wings; legs distinctly bristled, and not specially 

 slender. (media, Beck., ?) 



489. Amaurosoma, Beck. 



1 (16). Legs yellow, at most the tarsi darkened, and the fore 



femora with a dark stripe on the upper side. 



2 (9). Dorsum slightly dusted with two shining stripes ; 



scutellum somewhat shining. 



3 (4). Fore femora on the inner side with 8-10 bristles 



which point forward. (puberula, Beck., $) 



4 (3). Fore femora not bristled on the inner side. 



5 (6). Pleurae shining black. (brevifrons, Ztt.) 



6 (5). Pleurae not shining, dusted blackish grey. 



