382 DURHAM DIPTERA. 



LVI. 658. 



33(34). V, 3. slightly bent up; wings hyaline; frons bristly; 

 size about 1 mm. 



2826. Limosina vitripennis, Ztt. 

 Bishop Auckland, 2 ?, May, 1900, 1 ?, January, 1902. 



34 (33). V.3. straight; wings whitish; frons almost bare; size 



£ mm. (2829. minutissima, Ztt.) 



35 (24). Antennae turned in opposite directions, lying close to 



the eyes. 



36 (41). Eyes bare. 



37 (38). Wings and veins brownish yellow ; dorsum with an 



impressed central line ; size 2^- mm. 



(281 1. zostera, Hal.) 



38 (37). Wings whitish ; veins of the hind region colourless. 



39 (40). Dusky species with paler legs ; veins of the fore 



region dark; mid tibiae bristly; C 2 longer than C 3 ; 

 size 1^ mm. (2834. leucoptera, Hal.) 



40 (39). Velvet black species ; all veins colourless except the 



costa ; V.3. bent and ending in the fore margin 

 considerably before the wing tip ; mid tibiae almost 

 bare; scarcely 1 mm. (2831. nigerrima, Hal.) 



41 (36). Eyes with minute erect hairs ; velvet black species 



with delicate, coloured veins ; V.3. almost straight, 

 ending nearer the wing tip. (2833. melania, Hal.) 



42 (15) (43). Face milk white ; mid tarsi orange. 



2812. Limositia pumilio, Mg. 

 Hesleden, 1 $, April, 1901. 



43 (15) (42). Face yellow or orange. 



44 (47). C 2 much longer than C 3 . 



45 (46). Halteres dark ; abdomen shining black. 



(2813. flaviceps, Stnh.) 



46 (45). Halteres whitish ; abdomen dull black. 



(2817. scutellaris, Hal.) 



47 (44). C 2 about equal to C 3 . 



48 (55). Legs mostly reddish, at least the knees and tarsi pale. 



49 (50). Head all yellow, except at the back and a dot on the 



vertex. (2816. ochripes, Mg.) 



