126 DURHAM DIPTERA. 



XXIII. 218. 



80 (29). Abdomen shining black ; tarsi entirely yellow, quite 

 unmarked. ( Ii: 7i« ecalceata, Ztt.) 



31 (26) (34). Antenna brown. 



32 (33). Antennae longer than the head, first joint black, 



small species, i mm. ( IX 45- dissimilis, Fin.) 



83 (32). Antennae shorter than the head, size 3 mm. 



(1163. comfiungens, Wlk.; 



34 (26) (31). Antennae yellow, with at least the end of the third 



joint brown or black. 



35 (38). Abdomen partly yellow. 



36 (37). Abdomen black above, yellow beneath. 



(n 76. pallidiventris, Mg.) 



37 (36). Abdomen yellow-brown with two rows of dark spots. 



(1167. varia, Wlk.) 



38 (35). Abdomen all black or grey. 



39 (48). Tarsi black or brown ringed. 



40 (43). Wings grey at the tips, yellow at the base of the fore 



border. 



41 (42). Wings brown-grey, yellow along the fore border, 



palpi yellow, third antennal joint all black. 



(1169. infuse at a, Mg.) 



42 (41 ). Wings pale yellow, grey at the tips, palpi white, only 



the tip of the third antennal joint black. 



(1168. divisa, Wlk.) 



43 (40). Wings clear, or at most uniformly yellowish. 



44 (45). V.3. and V.4. not parallel, but distinctly converging 



near the wing-tip. Palpi large. Abdomen with 

 grey side-spots. 



1 1 70. Tachydromia cursitans, F. 

 Hesleden, 1 $, August, 1899; Bishop Auckland, 2 $, 

 July, 1901-02. 



45 (44). V.3. and V.4. parallel ; palpi small. 



46 (47). Palpi yellow ; tip of the antennae brown ; base of the 



first abdominal segment grey. 



1 1 77. Tachydromia bicolor, F. 

 Hesleden, 1 $, August, 1899. 



