134 CECIDOMYZID.E. 



Lives on Poa nemoralis, and forms oval, rough galls, in which 

 it assumes the winged state. 



C. amcena, Loew, and C. gibha, Zett., also belong to the Subge- 

 nus Hormomyia. 



146. angustipennis, Wimi. Linn. Ent. viii. 293. 83 (1853). 

 Fcevi. flava, autennis fuscis basi flavis 13-articulatis corporis longitu- 

 diue, articulis mediocriter petiolatis, thorace vittis tribus fuscis, alis 

 longissimis angustis subfuscescentibus, venis fuscis, oviductu brevi la- 

 mellis duabus longi-ovatis, pedibus fuscis longissimis. Long. -|- lin. 



Fein. Yellow. Antennae thirteen-jointed, brown, yellow at the base ; 

 joints about twice the length of their petioles. Thorax with three 

 brown stripes. Wings brownish, narrow, very long ; veins brown ; 

 transverse veinlet at three-fourths of the length of the subcostal vein. 

 Halteres yellow, with brown knobs. Oviduct short, with two elongated 

 oval valves. Legs brown, very long ; second joint of the tarsi much 

 longer than the tibiae. 



Lives in decayed beech-wood. 



Note. Loew's subgenus Birhiza contains only one species, D. 

 lateritia, Loe\v. 



147. defecta, Loew, Pr. Pos. Gymn. 38. 57 (1850) ; Winn. Tal- 

 lide flava, alis longis angustis fere limpidis, venis pallide fuscescentibus, 

 halteribus albis, pedibus pallide fuscescentibus, tarsis apice albidis ; 

 Mas, antennis 15-articulatis pallide fuscis corpore duplo longioribus 

 basi petiolisque albo-flavis, his longissimis ; Fcem. antennis 13-articu- 

 latis fuscis basi flavis corpore vix brevioribus, petiolis brevioribus, ovi- 

 ductu sat longo laraellis nulhs. Long, fere 1 lin. 



Pale yellow. Wings nearly limpid. Halteres white. Legs pale 

 brown ; fourth and fifth joints of the tarsi whitish. Male. Antenna; 

 fifteen-jointed, pale brown, twice the length of the body ; joints half 

 the length of their petioles, which are whitish-yellow. Fem. Antenna; 

 thirteen-jointed, brown, yellow at the base, almost as long as the body ; 

 joints twice the length of their petioles. Oviduct moderately long, 

 generally retracted, without valves. 



Lives in decayed beech-wood. 



148. gracilis, Winn. Linn. Ent. viii. 298. 89 (1853). Flava, an- 

 tennis fuscis basi flavis, thorace vittis tribus nigro-fascis, alis sublimpidis, 

 venis fuscis, halteribus pallide fuscis basi albis, akloiiiiue flavescente 

 fusco incisuris j)allidioribus, pedibus fuscescentibus aut nigro-fuscis, 

 tarsis apice niveis ; Mas, antennis 16-articulatis corpore longioribus, 

 articulorum petiolis longissimis ; i^rww. antennis 13-articulatis corpore 

 brevioribus, petiolis abbreviatis, abdomiue toto flavo, oviductu brcvi 

 lamellis duabus ovatis. Long. 1 lin. 



YeUoto. Antenna; brown. Thorax witlc three blackish-brown stripes. 

 W^ings nearly limjnd ; aiud vein and its second branch fornung an 

 ahuost right angle. Jbdomen yellowish-brown, with pule sutures. Legs 



