144 DURHAM DIPTERA. 



XXIV. 233. 



150 (147). Third antennal joint partly yellow. 



151 (152). Squamae with yellow fringes. 



(1225. strigipes, Verr.) 



152 (151). Squamse with black fringes. 



153 (156). First antennal joint all yellow. 



154 (155). Hind tibiae black at tip. plumipes, Scop. (1208) 



155 (154). Hind tibiae at the tip and the base of hind tarsi 



pale. (1209. wahlbergi, Ztt.) 



156 (153). First antennal joint blackened above. 

 157(158). Hind coxae mostly pale yellow; hind tibiae all 



yellow. ( I2I 5- longicornis, Stan.) 



158 (157). Hind coxae mostly grey. (1223. sabinus, Hal.) 



159 (39). Lower post-orbital bristles black. 



160 (161). Hind femora with more than one praeapical bristle 



(three or more in the male). 

 1232. Dolichopus ungulatus, L. (jzneus, Deg.) 



A common species. Hesleden, Bishop Auckland, 

 Harperley, and Bedburn. 



161 (160). Hind femora with only one praeapical bristle. 



162 (168) (164). Face white ; frons green (?) ; hind femora 



fringed with black {$) ; mid metatarsus with no 



strong bristle above (?). 



(1231. longitarsis, Stan.) 



163 (162) (164). Face yellow ($); face and frons grey (?); 



fore tarsi normal • femora not fringed ($) ; mid 

 metatarsi without a strong bristle ( $ )• 



(1202. rupestris, Hal.) 



164 (162) (163). Face yellow; femora pale fringed, and last 



joint of fore tarsi dilated {$). Mid metatarsi 



with a strong bristle above. 



(1230. brevipennis, Mg.) 



224. Tachytrechus, Stan. 



1 (2). Fore tibiae not bristly. Face white. Fore tarsal 

 joints 2-5 much dilated. Fore metatarsus thin, 

 and about as long as the other four joints together. 

 V.4 8 with a dark spot. (1234. consobrhius, Wlk.) 



