136 AN ACCOUNT OF BRITISH FLIES. 



\ Sciophila, Curtis et Zett. 

 G^^vs.-Tetragoneura, Wtz.* = | ^_y,,^,^^,y^^ Mg. 



Body slender and elongated. Head small and round, flat above. 

 Eyes round. Proboscis short. Labium short and fleshy, rigid in front 

 and hairy. Coxge elongated, femora compressed, lateral spines on 

 hind tibiae. Wings longer than abdomen ; costal does not extend to 

 tip of the wing. First longitudinal vein very short, third ending 



te- 



ll^. 



Fig. 27. — Head of Tetragoneiira Sylvatica. 



before tip of wing : base of the fourth hind areolet in a transverse 

 line with the base of the second, or very near the base of the wing. 

 Joints of the antennae cylindrical. The larvae live in fungi and rotten 

 wood. 



T. hirta, Wtz. = S. dissimilis, Zett. 



Black, clothed with whitish hairs. Thorax with grayish tinge, beset 

 with large light hairs. Abdomen in $ dark brown with light hairs 

 and somewhat shiny, ventral segment yellow ; in the ? the abdomen 

 is yellow, the segments have a black dorsal stripe and black bands, 

 except the sixth and seventh segments, which are entirely black. 

 Hypopygium yellow; ovipositor and lamellae brown. Head dark 

 brown, vertex sometimes grayish ; proboscis and palpi yellow. An- 

 tenna dark brown, basal and second joints yellow. Wings hyaline, 

 costa dark, areolet oblong ; second and third longitudinal veins brown, 

 the rest pale ; the first longitudinal ending in the second before its 

 middle ; fork of fourth longitudinal opposite apex of areolet ; fork 

 of the fifth nearly at the base of the wing. Legs light yellow ; coxae 

 and tips of posterior femora dark brown, the latter has a black streak 

 at the base on the ventral side ; tibiae and tarsi brown ; posterior 

 tibia longer than metatarsus. Length i^ lin. This is a rare species. 

 Haliday records it from Ireland. 



There are two other species of this genus recorded from Great 

 Britain, viz., sylvatica, Curtis, Brit. Ent., xiv., 641, 16 (1837), and 

 Winnertz, Verb. d. Zool. Bot. Ges., xiii. 766. 2 { = distincta) and 

 melanoceras, Wlk., vide Walker, Ins. Brit., Dip., vol. iii., p. 46.! 



* Ent. Zeit. V., Stett. vii. 18 (1846). 



t Syh>atica='S\a.ck ; proboscis, palpi and second Joint of antcnnic yellow. 



