HYDROMYZIDES. '241 



wing ; praebrachial ending at a little behind the tip. Halteres whitish. 

 Hind borders of the abdominal segments yellow. Legs yellow ; tips of 

 the tarsi brown. Fern. Abdomen elongate-obconical ; tip yellow. 

 Not common. (E.) 



9. terminalis, Meig. Zw. vi. 195. 24 (1830) ; Mcq. Flava, an- 

 tennis nigris basi flavis, thorace cinereo-trivittato, alis limpidis, halteri- 

 bus albidis, metathorace abdominisque apice nigris. Long. 1-H; alar. 

 2-2f lin. 



Yellow. Triangle of the ocelli and hind part of the head black. 

 Antennae black, yellow at the base. Thorax with three broad grey 

 stripes. Metathorax black. Wings limpid; veins yellow; cubital 

 vein ending much nearer to the radial than to the tip of the wing ; 

 prsebrachial ending at very little behind the tip. Halteres whitish. 

 Tarsi brown. Fern. Abdomen elongate-obconical ; tip black. 



Common. (E. S. I.) 



10. flava, Fal. Phytomyz. 3. 5 (1820); Meig.; Mcq.; Zett. Lu- 

 teo-flava, antennis nigris basi flavis, metathorace fulvo, alis limpidis 

 halteribus albidis, abdomine nonnunquam fasciis fuscescentibus. Long. 

 H-H ; alar. 2i-2f lin. 



Luteous-yellow. Triangle of the ocelli and hind part of the head 

 blackish. Eyes red. Antennas black, yellow at the base. Scutellum 

 pale-yellow. Metathorax tawny. Wings limpid ; veins yellow ; cubi- 

 tal vein ending much nearer to the radial than to the tip of the wing ; 

 pra3brachial ending at hardly behind the tip. Halteres whitish. Ab- 

 domen occasionally with brownish bands. Legs yellow. Fern. Abdo- 

 men elongate-obconical. 



Common. (E. S. I.) 



11. populicola, Hal. MSS. Flava, thorace luteo-tiivittato, meta- 

 thorace nigro, alis limpidis, halteribus albidis ; Fcem. abdominis apice 

 iiigro. Long. |~1 ; alar. 2-2^ lin. 



Pale-yellow. Triangle of the ocelli and hind part of the head deep- 

 black. Eyes black. Thorax with three very broad almost united pale 

 luteous stripes, which occupy nearly the whole of the disc. Metathorax 

 black. Wings limpid ; veins yellow ; cubital vein ending nearer to the 

 radial than to the tip of the wing ; prabrachial ending at hardly be- 

 hind the tip of the wing. Halteres whitish. Legs yellow. Fern. Ab- 

 domen subfusiform ; tip black. 



Bare. (I.) 



SUBFAMILY 10. HYDROMYZIDES. 



HYDROMYZIDES, Hal.; Westw. Class. (1840). Hydromyzida, Fal.; Zett. 



Fades convexa, dbsqiie foveolis membranaceis. Peristoma rotundatum. 

 Mentum breve incrassatum. Antennse breves, articulo primo incon- 



