DURHAM DIPTERA. 1 25 



XXIII. 218. 



10 (68). Dorsum not shining black, mostly grey, or if black 



then with lighter dusting. 



11 (57). Legs mostly orange or yellow, at most the tarsi 



dark, or a dark streak on the upper side of the 

 femora. 



12 (25). Antennae entirely black. 



13 (14). Antennae rather longer than the head. 



(1144. longicornis, Mg.) 



14 (13). Antennae shorter than the head. 



15 (16). Last joint of the antennae lengthened, nearly as long 



as the arista. Abdomen black with narrow grey 

 borders to the segments ; tarsi dark brown. 



(1161. tnaculipeS) Mg.) 



16 (15). Last joint of the antennae short; abdomen entirely 



black above without any grey incisions ; tarsi 

 black or brown ringed. 



17 (18). Mid femora in the male, and all femora in the female 



with at least a dark stripe or spot. 



(1153. agilis, Mg.) 



18 (17). At least the fore and mid femora yellow. 



19 (24). Large species, 2^-3 mm. 



20 (23). Abdomen all shining black ; mid knees dark. 



21 (22). Wing-veins black ; hind knees not dark ; z\ mm. 



(1159. dichroa, Mg.) 



22 (21). Wing- veins brown; hind knees and tip of hind tibiae 



dark; 3 mm. (1162. flavipes, F.) 



23 (20). Abdomen black above, tawny beneath ; mid knees 



not dark. (1160. commiles, Wlk.) 



24 (19). Small species, i-i^ mm. ; legs all yellow except the 



tips of the tarsi. ( XI 57' cothurnata, Mcq.) 



25 (12). Antennae at least partly yellow, white, or brown. 



26 (31) (34). Antennae all yellow or white, not more than the 



terminal arista dark. 



27 (28). Antennae white. ( II 7^. albicornis, Ztt.) 



28 (27). Antennae yellow. 



29 (30). Abdomen black with grey incisions ; tips of the last 



tarsal joints dark. ( XI 75- flavicornis, Mg.) 



